Professor Timothy Ralph

Professor

Physics
Faculty of Science
ralph@physics.uq.edu.au
+61 7 334 69693

Overview

Professor Ralph obtained a BSc Hons from Macquarie University in 1989 and a PhD in Physics from The Australian National University in 1993. He has held three Australian Research Council Fellowships - Postdoctoral, QEII and Professorial. He is currently Node Director for the ARC Centre of Exellence for Quantum Computation and Communication Technology at the University of Queensland.

Research Interests

  • Linear Optics Quantum Computation.
    As part of the Centre for Quantum Computation and Communication Technology we are attempting to understand and implement simple quantum gates using the techniques of linear optics and measurement induced state projection.
  • Quantum Communication with Lasers.
    Quantum information techniques allow one to communicate with absolute security, amongst other applications. As part of the Centre for Quantum Computation and Communication Technology we are developing such secure communication protocols based on sending coherent states of light and measuring their amplitudes.
  • Relativistic Quantum Information.
    This project examines the interface between quantum mechanics, general relativity and information theory. It asks, both at a fundamental and practical level, what the ramifications for quantum information theory are when space-time curvature and rapid motion are introduced.

Qualifications

  • PhD, Australian National University
  • Bachelor of Science, Macquarie University

Publications

  • Serikawa, Takahiro, Yoshikawa, Jun-Ichi, Takeda, Shuntaro, Yonezawa, Hidehiro, Ralph, Timothy C., Huntington, Elanor H. and Furusawa, Akira (2018) Generation of a cat state in an optical sideband. Physical Review Letters, 121 14: 143602. doi:10.1103/PhysRevLett.121.143602

  • Cree, Samuel S., Davis, Tamara M., Ralph, Timothy C., Wang, Qingdi, Zhu, Zhen and Unruh, William G. (2018) Can the fluctuations of the quantum vacuum solve the cosmological constant problem?. Physical Review D, 98 6: . doi:10.1103/PhysRevD.98.063506

  • Qiang, Xiaogang, Zhou, Xiaoqi, Wang, Jianwei, Wilkes, Callum M., Loke, Thomas, O'Gara, Sean, Kling, Laurent, Marshall, Graham D., Santagati, Raffaele, Ralph, Timothy C., Wang, Jingbo B., O'Brien, Jeremy L., Thompson, Mark G. and Matthews, Jonathan C. F. (2018) Large-scale silicon quantum photonics implementing arbitrary two-qubit processing. Nature Photonics, 12 9: 534-539. doi:10.1038/s41566-018-0236-y

View all Publications

Supervision

View all Supervision

Publications

Book

Book Chapter

  • Ralph, Tim C. and Pryde, Geoff J. (2009). Optical quantum computation. In Emil Wolf (Ed.), Progress in optics (pp. 209-269) Oxford, United Kingdom: Elsevier. doi:10.1016/S0079-6638(10)05409-0

  • Jeong, H. and Ralph, T. C. (2007). Schrodinger Cat States for Quantum Information Processing. In Nicolas J. Cerf, Gerd Leuchs and Eugene S. Polzik (Ed.), Quantum Information with Continuous Variables of Atoms and Light (pp. 159-177) London: Imperial College Press.

  • Jeong, Hyunseok and Ralph, Timothy C. (2007). Schrödinger cat states for quantum information processing. In Quantum Information with Continuous Variables of Atoms and Light (pp. 159-180) : Imperial College Press. doi:10.1142/9781860948169_0009

  • Symul, T., Lance, A. M., Bowen, W. P., Lam, P. K., Sanders, B. C. and Ralph, T. C. (2006). Quantum State Sharing. In A. Sergienko (Ed.), Quantum Communications and Cryptography (pp. 163-186) New York: Taylor & Francis.

  • Ralph, T. C. (2004). Squeezing from lasers. In P D Drummond and Z Ficek (Ed.), Quantum Squeezing 2004 ed. (pp. 141-170) Berlin: Springer.

  • Ralph, T. C. (2003). Quantum key distribution with continuous variable in optics. In Samuel L. Braunstein and Arun K. Pati (Ed.), Quantum Information with Continuous Variables (pp. 295-316) Netherlands: Kluwer Academic Publishers.

Journal Article

Conference Publication

  • Serikawa, Takahiro, Yoshikawa, Jun-ichi, Yonezawa, Hidehiro, Ralph, Timothy C., Huntington, Elanor H. and Furusawa, Akira (2018). Generation of Schrödinger’s cat state in an optical double sideband mode. In: CLEO: QELS_Fundamental Science, CLEO_QELS 2018. CLEO: QELS_Fundamental Science, CLEO_QELS 2018, San Jose, CA, United States, (). 13–18 May 2018. doi:10.1364/CLEO_QELS.2018.FTh4G.6

  • Zhao, Jie, Dias, Josephine, Haw, Jing Yan, Bradshaw, Mark, Blandino, Remi, Symul, Thomas, Ralph, Timothy, Assad, Syed and Lam, Ping Koy (2017). Quantum enhancement of signal-to-noise ratio for arbitrary coherent states using heralded linear amplifiers. In: 2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR). Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), Singapore, (). 31 July-4 August 2017. doi:10.1109/CLEOPR.2017.8119107

  • Haw, Jing Yan, Zhao, Jie, Dias, Josephine, Assad, Syed M., Bradshaw, Mark, Blandino, Remi, Symul, Thomas, Ralph, Timothy C. and Lam, Ping Koy (2017). Surpassing the no-cloning limit with a heralded hybrid linear amplifier. In: 2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR). Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), Singapore, (). 31 July-4 August 2017. doi:10.1109/CLEOPR.2017.8119040

  • Ralph, T. C. (2016). New directions in optical quantum computing. In: 2015 11th Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2015. 11th Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2015, Busan, South Korea, (). 24 - 28 August 2015. doi:10.1109/CLEOPR.2015.7375881

  • Chrzanowski, Helen M., Gu, Mile, Assad, Syed M., Symul, Thomas, Modi, Kevan, Ralph, Timothy C., Vedral, Vlatko and Lam, Ping Koy (2014). Discord as a quantum resource for bi-partite communication. In: Schmiedmayer, HJ and Walther, P, Quantum Communication, Measurement and Computing (QCMC): Eleventh International Conference. 11th International Conference on Quantum Communication, Measurement and Computation, QCMC 2012, Vienna, Austria, (116-118). 30 July- 3 August 2012. doi:10.1063/1.4903110

  • Patel, Raj B., Kocsis, Sacha, Ho, Joseph, Hall, Michael J. W., Ferreyrol, Franck, Bennet, Adam, Ralph, Timothy C. and Pryde, Geoff J. (2014). Entanglement and simplified quantum information operations. In: Frontiers in Optics, FiO 2014. Frontiers in Optics 2014, Tucson, AZ, United States, (). 19–23 October 2014. doi:10.1364/FIO.2014.FW4C.1

  • Hosseini, Sara, Rahimi-Keshari, Saleh, Haw, Jing Yan, Assad, Syed M., Chrzanowski, Helen M., Janousek, Jiri, Symul, Thomas, Ralph, Timothy C., Lam, Ping Koy, Gu, Mile, Modi, Kavan and Vedral, Vlatko (2014). Experimental verification of quantum discord in continuousvariable states and operational significance of discord consumption. In: CLEO: 2014. CLEO: QELS Fundamental Science (CLEO QELS 2014), San Jose, CA United States, (). 8-13 June 2014.

  • Kuntz, Katanya B., Song, Hongbin, Webb, James G., Wheatley, Trevor A., Furusawa, Akira, Ralph, Timothy C. and Huntington, Elanor H. (2014). Quantum non-Gaussian and Gaussian states at multiple side-band frequencies. In: CLEO: 2014. CLEO: QELS Fundamental Science (CLEO QELS 2014), San Jose, CA United States, (). 8-13 June 2014.

  • Broome, Matthew A., Fedrizzi, Alessandro, Rahimi-Keshari, Saleh, Branczyk, Agata M., Dove, Justin, Aaronson, Scott, Ralph, Timothy C. and White, Andrew G. (2013). Bosonsampling with realistic single-photon sources. In: Lasers and Electro-Optics Europe (CLEO EUROPE/IQEC), 2013 Conference on and International Quantum Electronics Conference. International Quantum Electronics Conference, IQEC 2013, Munich, Germany, (). 12 - 16 May 2013. doi:10.1109/CLEOE-IQEC.2013.6801699

  • Lam, P. K., Hosseini, M., Campbell, G., Pinel, O., Sparkes, B., Twamley, J., Rebic, S., Chrzanowski, H. M., Assad, S., Bernu, J., Ralph, T. C., Walk, N., Symul, T. and Buchler, B. C. (2013). Building a quantum repeater with quantum memories and noiseless amplifiers. In: Lasers and Electro-Optics Pacific Rim (CLEO-PR), 2013 Conference on. 10th Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2013, Kyoto, Japan, (). 30 June - 4 July 2013. doi:10.1109/CLEOPR.2013.6599943

  • Ralph, T. C., Walk, N., Symul, T. and Lam, P. K. (2013). Continuous-variable QKD with post-selection is secure. In: Photonics Society Summer Topical Meeting Series, 2013 IEEE. IEEE Photonics Society Summer Topical Meeting Series, PSSTMS 2013, Waikoloa, HI, (165-165). 8 - 10 July 2013. doi:10.1109/PHOSST.2013.6614521

  • Rahimi-Keshari, Saleh, Broome, Matthew A., Fickler, Robert, Fedrizzi, Alessandro, Ralph, Timothy C. and White, Andrew G. (2013). Direct characterization of any linear photonic device. In: 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference (CLEO EUROPE/IQEC). Proceedings. Conference on Lasers and Electro-Optics Europe & International Quantum Electronics Conference (CLEO/Europe-IQEC), Munich, Germany, (). 12-16 May, 2013. doi:10.1109/CLEOE-IQEC.2013.6801733

  • Fedrizzi, Alessandro, Broome, Matthew A., White, Andrew G., Fickler, Robert, Rahimi-Keshari, Saleh and Ralph, Timothy C. (2013). Direct characterization of any linear photonic device. In: APS March Meeting 2013. Proceedings. APS March Meeting 2013, Baltimore, MD, USA, (). 18–22 March, 2013.

  • Gu, M., Chrzanowski, H. M., Assad, S. M., Symul, T., Modi, K., Ralph, T.C., Vedral, V. and Lam, P. K. (2013). Discord as a consumable resource. In: Lasers and Electro-Optics Pacific Rim (CLEO-PR), 2013 Conference on. 10th Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2013, Kyoto, Japan, (). 30 June - 4 July 2013. doi:10.1109/CLEOPR.2013.6600227

  • Broome, M. A., Fedrizzi, A., Rahimi-Keshari, S., Dove, J., Aaronson, S., Ralph, T. C. and White, Andrew G. (2013). Experimental bosonsampling. In: Quantum Information and Measurement (QIM) 2013 and Conference on Coherence and Quantum Optics (CQO) 2013. Proceedings. CQO-X: The Tenth Rochester Conference on Coherence and Quantum Optics, 2013, with QIM 2: The Second International Conference on Quantum Information and Measurement, 2013, Rochester, NY, USA, (W5B.3.1-W5B.3.2). 17-20 June, 2013. doi:10.1364/QIM.2013.W5B.3

  • Broome, Matthew A., Fedrizzi, Alessandro, Rahimi-Keshari, Saleh, Dove, Justin, Aaronson, Scott, Ralph, Timothy C. and White, Andrew G. (2013). Experimental bosonsampling in a photonic circuit. In: Photonics Society Summer Topical Meeting Series, 2013 IEEE. IEEE Photonics Society Summer Topical Meeting Series, PSSTMS 2013, Waikoloa, HI, (185-186). 8 - 10 July 2013. doi:10.1109/PHOSST.2013.6614564

  • Broome, Matthew A., Fedrizzi, Alessandro, Rahimi-Keshari, Saleh, Dove, Justin, Aaronson, Scott, Ralph, Timothy C. and White, Andrew G. (2013). Experimental bosonsampling in a tunable optical network. In: CLEO: QELS_Fundamental Science, CLEO:QELS FS 2013. CLEO: QELS_Fundamental Science, CLEO:QELS FS 2013, San Jose, CA United States, (). 9 - 14 June 2013. doi:10.1364/CLEO_QELS.2013.QW1C.3

  • Ferreyrol, F., Ralph, T. C. and Pryde, G. J. (2013). Implementation of a quantum Fredkin gate using an entanglement resource. In: 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference (CLEO EUROPE/IQEC). Proceedings. CLEO/EUROPE - IQEC 2013: Conference on Lasers and Electro-Optics - International Quantum Electronics Conference, Munich, Germany, (IB_6_5-IB_6_5). 13-16 May, 2013. doi:10.1109/CLEOE-IQEC.2013.6801703

  • Walk, N., Symul, T., Lam, P. K. and Ralph, T. C. (2013). Unconditional security of Gaussian post-selected continuous variable quantum key distribution. In: 2013 Conference on and International Quantum Electronics Conference Lasers and Electro-Optics Europe (CLEO EUROPE/IQEC). 2013 Conference on Lasers and Electro-Optics Europe & International Quantum Electronics Conference (CLEO/Europe-IQEC 2013), Munich, (). 12-16 May 2013. doi:10.1109/CLEOE-IQEC.2013.6801697

  • Janousek, Jiri, Chrzanowski, Helen, Hosseini, Sarah, Assad, Syed, Symul, Thomas, Walk, Nathan, Ralph, Tim and Lam, Ping Koy (2013). Virtual noiseless amplification. In: 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference (CLEO EUROPE/IQEC). Proceedings. CLEO/EUROPE - IQEC 2013: Conference on Lasers and Electro-Optics - International Quantum Electronics Conference, Munich, Germany, (IB_P_3-IB_P_3). 13-16 May, 2013. doi:10.1109/CLEOE-IQEC.2013.6801727

  • Assad, Syed, Chrzanowski, Helen, Symul, Thomas, Lam, Ping Koy, Ralph, Tim, Gu, Mile and Vedral, Vlatko (2011). A functional interpretation of continuous variable quantum discord. In: 2011 International Quantum Electronics Conference (IQEC 2011) and Conference on Lasers and Electro-Optics (CLEO 2011) Pacific Rim Incorporating the Australasian Conference on Optics, Lasers and Spectroscopy and the Australian Conference on Optical Fibre Technology. Proceedings. IQEC/CLEO Pacific Rim Conference 2011 incorporating ACOLS and ACOFT, Sydney, NSW, Australia, (1200-1202). 28 August-1 September, 2011. doi:10.1109/IQEC-CLEO.2011.6194178

  • Wheatley, T. A., Berry, D. W., Yonezawa, H., Nakane, D., Arao, H., Pope, D. T., Ralph, T. C., Wiseman, H. M., Furusawa, A. and Huntington, E. H. (2011). Adaptive optical phase estimation using time-symmetric quantum smoothing. In: Timothy Ralph and Ping Koy Lam, Quantum Communication, Measurement and Computing (QCMC): The Tenth International Conference. 10th International Conference on Quantum Communication, Measurement and Computing (QCMC), Brisbane, Australia, (129-132). 19-23 July 2010. doi:10.1063/1.3630163

  • Walk, Nathan, Ralph, Timothy C., Symul, Thomas and Lam, Ping Koy (2011). Security of Post-selection based Continuous Variable Quantum Key Distribution against Arbitrary Attacks. In: Conference on Lasers and Electro-Optics (CLEO), Baltimore Md, (). May 01-06, 2011.

  • Yonezawa, Hidehiro, Nakane, Daisuke, Wheatley, Trevor A., Iwasawa, Kohjiro, Takeda, Shuntaro, Arao, Hajime, Berry, Dominic W., Ralph, Timothy C., Wiseman, Howard M., Huntington, Elanor and Furusawa, Akira (2011). Squeezing-enhanced adaptive optical phase estimation. In: Optics InfoBase Conference Papers. Quantum Electronics and Laser Science Conference (QELS), Baltimore, MD, United States, (). 1-6 May 2011. doi:10.1364/QELS.2011.QFD5

  • Pienaar, Jacques, Myers, Casey and Ralph, Timothy C. (2011). The Heisenberg picture for single photon states. In: Timothy Ralph and Ping Koy Lam, Quantum Communication, Measurement and Computing (QCMC): The Tenth International Conference. 10th International Conference on Quantum Communication, Measurement and Computing (QCMC), Brisbane, Australia, (248-251). 19-23 July 2010. doi:10.1063/1.3630189

  • Branczyk, Agata M., Stace, Thomas M. and Ralph, T. C. (2011). Time ordering in spontaneous parametric down-conversion. In: Timothy Ralph and Ping Koy Lam, Quantum Communication, Measurement and Computing (QCMC): The Tenth International Conference. 10th International Conference on Quantum Communication, Measurement and Computing (QCMC), Brisbane, Australia, (335-338). 19-23 July 2010. doi:10.1063/1.3630207

  • Nakane, D., Wheatley, T. A., Berry, D. W., Yonezawa, H., Arao, H., Pope, D. T., Ralph, T. C., Wiseman, H. M., Huntington, E. H. and Furusawa, A. (2010). Adaptive optical phase estimation. In: 2010 Conference on Lasers and Electro-Optics and 2010 Conference on Quantum Electronics and Laser Science (CLEO/QELS 2010 ). Proceedings. CLEO/QELS: 2010 Laser Science to Photonic Applications. Conference on Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS), San Jose, CA, USA, (1-2). 16-21 May, 2010. doi:10.1364/CLEO.2010.JThF4

  • Politi, Alberto, Matthews, Jonathan C. F., Laing, Anthony, Peruzzo, Alberto, Kalasuwan, Pruet, Zhou, Xiao-Qi, Rodas, Maria, Cryan, Martin J., Rarity, John G., Stefanov, Andre, Ralph, Timothy C., Yu, Siyuan, Thompson, Mark G. and O'Brien, Jeremy L. (2010). Advances in photonic quantum information science. In: 2010 Conference on Lasers and Electro-Optics and 2010 Conference on Quantum Electronics and Laser Science (CLEO/QELS 2010 ). Proceedings. CLEO/QELS: 2010 Laser Science to Photonic Applications. Conference on Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS), San Jose, CA, USA, (1-2). 16-21 May, 2010. doi:10.1364/IPRSN.2010.IMA2

  • Symul, T., Sharma, V., Ralph, T. C. and Lam, P. K. (2010). Coherent state quantum key distribution with continuous-wave laser beams. In: E. Bert Basch, John C. Cartledge and Ekaterina Golovchenko, 2010 Conference on Optical Fiber Communication, Collocated National Fiber Optic Engineers Conference (OFC/NFOEC 2010). Proceedings. OFC/NFOEC 2010: Conference on Optical Fiber Communication, collocated National Fiber Optic Engineers Conference, San Diego, CA, USA, (OWC6.1-OWC6.3). 21-25 March, 2010. doi:10.1364/OFC.2010.OWC6

  • Pienaar, Jacques and Ralph, Timothy C. (2010). Event operators and quantum gates. In: J. G. Hartnett and P. C. Abbott, Frontiers of Fundamental and Computational Physics: 10th International Symposium 2009. Proceedings. FFP10: Tenth International Symposium. Frontiers of Fundamental and Computational Physics 2009, Perth, WA, Australia, (160-164). 24-26 November, 2009. doi:10.1063/1.3460194

  • Heurs, M., Webb, J. G., Ralph, T. C. and Huntington, E. H. (2010). Generation of a comb of vacuum squeezing over 2.4 GHz for multiplexed communication. In: 2010 Conference on Lasers and Electro-Optics and 2010 Conference on Quantum Electronics and Laser Science (CLEO/QELS 2010 ). Proceedings. CLEO/QELS: 2010 Laser Science to Photonic Applications. Conference on Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS), San Jose, CA, USA, (1-2). 16-21 May, 2010. doi:10.1364/QELS.2010.QFA2

  • Politi, Alberto, Matthews, Jonathan C. F., Laing, Anthony, Peruzzo, Alberto, Kalasuwan, Pruet, Zhou, Xiao-Qi, Verde, Maria Rodas, Rarity, John G., Stefanov, Andre, Ralph, Timothy C., Thompson, Mark G. and O'Brien, Jeremy L. (2010). Quantum information science with photonic chips. In: 36th European Conference and Exhibition on Optical Communication (ECOC 2010). Proceedings. ECOC 2010: 36th European Conference and Exhibition on Optical Communication, Torino, Italy, (422-424). 19-23 September, 201. doi:10.1109/ECOC.2010.5621301

  • Coldenstrodt-Ronge, H. B., Worsley, A. P., Lundeen, J. S., Feito, A., Pregnell, K. L., Silberhorn, Ch., Mosley, P. J., Smith, B. J., Puentes, G., Thomas-Peter, N., Ralph, T. C., Eisert, J., Plenio, M. B. and Walmsley, I. A. (2009). Full characterization of quantum optical detectors. In: 2009 Lasers & Electro-Optics & The Pacific Rim Conference on Lasers and Electro-Optics (CLEO/PACIFIC RIM 2009). Proceedings. CLEO/Pacific Rim 2009: 8th Pacific Rim Conference on Lasers and Electro-Optics, Shanghai, China, (342-343). 30 August–3 September, 2009. doi:10.1109/CLEOPR.2009.5292056

  • Xiang, G. Y., Ralph, T. C., Lund, A. P., Walk, N. and Pryde, Geoff J. (2009). Noiseless linear amplification and distillation of entanglement. In: ACOLS ACOFT. ACOLS ACOFT 09, The University of Adelaide, (403-404). 29/11/09 -3/12/09.

  • Ralph, T. C. and Lund, A. P. (2009). Nondeterministic noiseless linear amplification of quantum systems. In: Lvovksy, A, Ninth International Conference on Quantum Communication, Measurement and Computing (QCMC). Quantum Communication, Measurement and Computing (QCMC): Ninth International Conference on QCMC, Calgary, Canada, (155-160). 19-24 August 2008. doi:10.1063/1.3131295

  • Wheatley, T. A., Huntington, E. H., Berry, D. W., Wiseman, H. M. and Ralph, T. C. (2008). Quantum optical adaptive phase estimation of sidebands. In: Conference on Lasers and Electro-Optics, 2008 and 2008 Conference on Quantum Electronics and Laser Science : CLEO/QELS 2008. Conference on and Quantum Electronics and Laser Science Conference Lasers and Electro-Optics, QELS 2008, San Jose, CA, (). 4 - 9 May 2008. doi:10.1109/QELS.2008.4553149

  • Berry, D. W., Hyunseok, J., Stobinska, M. and Ralph, T. C. (2008). The CHSH-bell inequality and Tsirelson's bound with postselection. In: Conference on Lasers and Electro-Optics, 2008 and 2008 Conference on Quantum Electronics and Laser Science : CLEO/QELS 2008. Conference on and Quantum Electronics and Laser Science Conference Lasers and Electro-Optics, QELS 2008, San Jose, CA, (). 4 - 9 May 2008. doi:10.1109/QELS.2008.4553020

  • Downes, T., Milburn, G. J. and Ralph, T. C. (2007). Can gravitational curvature induce decorrelation of optical entanglement. In: Meyers, RE, Shih, Y and Deacon, KS, Proceedings SPIE: Quantum Communications and Quantum Imaging V. Quantum Communications and Quantum Imaging V, San Diego, USA, (67100O-1-67100O-11). 26 August 2007. doi:10.1117/12.740085

  • Leung P.M. and Ralph T.C. (2007). Improving fidelity of skewed output states of optical zeno gates. In: 2007 Quantum Electronics and Laser Science Conference, QELS. 2007 Quantum Electronics and Laser Science Conference, QELS, Baltimore, MD, (). May 6, 2007-May 11, 2007. doi:10.1109/QELS.2007.4431700

  • Grosse N.B., Symul T., Stobinska M., Ralph T.C. and Lam P.K. (2007). Measuring photon anti-bunching from sideband squeezing with continuous-variable techniques. In: 2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, CLEO. 2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, CLEO, Munich, (). June 17, 2007-June 22, 2007. doi:10.1109/CLEOE-IQEC.2007.4386953

  • Jeong, Hyunseok and Ralph, Timothy C. (2007). Schrodinger cat states for quantum information processing. In: Cerf, NJ, Leuchs, G and Polzik, ES, Quantum Information Processing and Communication Workshop, Prague Czech Republic, (159-+). 2005. doi:10.1142/9781860948169_0009

  • Ralph, T. C. (2006). A model for non-linear quantum evolution based on time displaced entanglement. In: Meyers, RE, Shih, Y and Deacon, KS, Proceedings SPIE: Quantum Communications and Quantum Imaging IV. Quantum Communications and Quantum Imaging IV, San Diego, USA, (63050P-1-63050P-8). 13 August, 2006. doi:10.1117/12.680097

  • Lund A.P. and Ralph T.C. (2006). Efficient coherent state quantum computing by adaptive measurements. In: Quantum Electronics and Laser Science Conference, QELS 2006. Quantum Electronics and Laser Science Conference, QELS 2006, Long Beach, CA, (). May 21, 2006-May 21, 2006.

  • Webb, J. G., Ralph, T. C. and Huntington, E. H. (2006). Homodyne measurement of average photon number. In: Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006. Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006, , , (). May 21, 2006-May 26, 2006. doi:10.1109/CLEO.2006.4628675

  • Gilchrist A., Hayes A.J.F. and Ralph T.C. (2005). Linear optical quantum computation with parity encoding. In: 2005 Quantum Electronics and Laser Science Conference (QELS). 2005 Quantum Electronics and Laser Science Conference (QELS), Baltimore, MD, (2-3). May 22, 2005-May 27, 2005.

  • Ralph, T. C., Langford, N. K., Bell, T. B., O'Brien, J. L., Pryde, G. J., White, A. G. and Milburn, G. J. (2004). Investigation of two qubit quantum gates in linear optics. In: Meyers, RE and Shih, Y, Quantum Communications and Quantum Imaging. Quantum Communications and Quantum Imaging, San Diego, USA, (161-170). 6-8 August 2003. doi:10.1117/12.505078

  • Bowen, W. P., Hsu, M. T. L., Symul, T., Lance, A. M., Buchler, B. C., Schnabel, R., Treps, N., Bachor, H.-A., Ralph, T. C. and Lam, P. K. (2004). Photon number diagram for characterizing continuous variable entanglement. , pp. 315-323. In: Peter Hannaford, Andrei Sidorov, Hans Bachor and Ken Baldwin, Proceedings of the XVI International Conference on Laser Spectroscopy (ICOLS03). Laser Spectroscopy, Palm Cove, Queensland Australia, (315-323). 14th -18th July, 2003. doi:10.1142/9789812703002_0048

  • O'Brien, J. L., Pryde, G. J., White, A. G., Ralph, T. C., Bell, T. B., Langford, N. K. and Milburn, G. J. (2003). Construction of a non-deterministic 2-photon CNOT gate. In: Quantum Electronics and Laser Science (QELS). Trends in Optics and Photonics Series: Quantum electronics and Laser Science (QELS), Baltimore, MD, United States, (). 1-6 June 2003. doi:10.1109/QELS.2003.237941

  • Korolkova, N, Heersink, J, Silberhorn, C, Leuchs, G, Ralph, TC and Loudon, R (2003). Continuous-variable polarization entanglement. In: Shapiro, JH and Hirota, O, 6th International Conference on Quantum Communication, Measurement and Computing (QCMC 02), Cambridge Ma, (137-140). Jul 22-26, 2002.

  • Pryde, G.J., O'Brien, J.L., Bell, T.B., Langford, N.K., Milburn, G.J., Ralph, T.C. and White, AG (2003). Efficient linear optical quantum computation. In: J.H. Shapiro and O. Hirota, 6th International Conference on Quantum Communication, Measurement and Computing (QCMC 02), Cambridge, MA, United States, (253-256). 22-26 July 2002.

  • Milburn, G.J., Ralph, T., Gilchrist, A., White, A., Munro, W.J. and Kendon, V (2003). Efficient linear optics quantum computation. In: J.H. Shapiro and O. Hirota, Quantum Communication, Measurement and Computing, Proceedings. 6th International Conference on Quantum Communication, Measurement and Computing (QCMC 02), Cambridge, MA, United States, (229-234). 22-26 July 2002.

  • Gilchrist, A., Kendon, V., Milburn, G. J., Munro, W. J., Ralph, T. C. and White, A. G. (2003). Efficient linear optics quantum computation. In: Proceedings of the 6th International Conference on Quantum Communication, Measurement and Computing (QCMC 02). 6th International Conference on Quantum Communication, Measurement and Computing (QCMC 02), Cambridge, Massachusetts USA, (229-234). 22-26 July 2002.

  • Pryde G.J., O'Brien J.L.O., White A.G., Ralph T.C., Bell T.B., Langford N.K. and Milburn G.J. (2003). Experimental linear optics controlled-NOT gates. In: 2003 European Quantum Electronics Conference, EQEC 2003. European Quantum Electronics Conference, EQEC 2003, Munich, , (). June 22, 2003-June 27, 2003. doi:10.1109/EQEC.2003.1314242

  • Symul, T., Bowen, W. P., Schnabel, R., Treps, N., Buchler, B. C., Ralph, T. C., Lance, A. M., Grosse, N. B., Dolinska, A., Wu, J. W., Gao, J. R., Fabre, C., Bachor, H.-A. and Lam, P. K. (2003). Optical squeezing in temporal, polarization, and spatial domains. In: Derek Abbott, Jeffrey H. Shapiro and Yoshihisa Yamamoto, Proceedings of SPIE: Fluctuations and Noise in Photonics and Quantum Optics. Fluctuations and Noise in Photonics and Quantum Optics II, Santa Fe, NM, USA, (67-77). 2nd June, 2003. doi:10.1117/12.497081

  • Ralph, T. C., Munro, W. J. and Milburn, G. J. (2003). Quantum computation based on linear optics. In: Liu, S, Guo, G, Lo, HK and Imoto, N, Proceedings of SPIE - Quantum Optics in Computing and Communications. Quantum Optics in Computing and Communications, Shanghai, China, (1-12). 16 October 2002. doi:10.1117/12.483016

  • Gilchrist, A., Ralph, T.C., Munro, W.J. and Milburn, G.J. (2003). Quantum computation with coherent states. In: J.H. Shapiro and O. Hirota, 6th International Conference on Quantum Communication, Measurement and Computing (QCMC 02), Cambridge, MA, United States, (245-248). 22-26 July 2002.

  • Nemoto, K., Gilchrist, A. G., Munro, W. J., Ralph, T. C., Braunstein, S. L. and Milburn, G. J. (2003). Quantum information processing with Schrodinger cats. In: Derek Abbott, Jeffrey H. Shapiro and Yoshihisa Yamamoto, Proceedings of SPIE - Fluctuations and Noise in Photonics and Quantum Optics. Fluctuations and Noise in Photonics and Quantum Optics, Santa Fe, NM, USA, (434-443). 2 June, 2003. doi:10.1117/12.497230

  • Bachor, HA, Lam, PK, Bowen, W, Schnabel, R, Bennetts, S, Buchler, B, Andersen, UL and Ralph, TC (2001). Optical quantum information processing: Experiments with CW laser light. In: Clark, RG, Experimental Implementation of Quantum Computation. 1st International Conference on Experimental Implementation of Quantum Computation, Sydney Australia, (220-225). Jan 16-19, 2001.

  • Bachor, Hans-A., Lam, P. K., Bowen, W. P., Schnabel, R., Bennetts, S., Buchler, B. C. and Ralph, T. C. (2001). Optical quantum information processing: experiments with CW laser light. In: Proceedings of the 1st International Conference on Experimental Implementation of Quantum Computation (IQC01). 1st International Conference on Experimental Implementation of Quantum Computation, Australian National Maritime Museum, Sydney, (220). 16th-19th January, 2001.

  • Ralph, T. C. (2001). Teleportation criteria: form and signifcance. In: H. J. Carmichael, R. J. Glauber and M. O. Scully, Lecture Notes in Physics/ Directions in Quantum Optics: Papers presented at the TAMU-ONR Workshop. TAMU-ONR Workshop, Jackson, Wyoming, USA, (187-192). 26-30 July, 1999. doi:10.1007/3-540-40894-0_17

  • Ralph, T. C., Munro, W. J. and Polkinghorne, R. (2000). Bell-type correlations from continuous variable measurements. In: 14th National Congress of the Australian Institute of Physics. AIP 2000, Adelaide University, (27-27). 10-15 Dec, 2000.

  • Ralph, T. C. (2000). Quantum information with continuous variables. In: Conference Digest: 2000 International Quantum Electronics Conference. 2000 IQEC, Nice Acropolis, France, (23-23). 10-15 September, 2000.

  • Ralph, T. C. (2000). Quantum key distribution with continuous variables. In: T. Gallagher, Quantum Electronics and Laser Science Conference: OSA Technical Digest. QELS 2000, The Moscone Convention Center, San Francisco, California, (208-208). 7-12 May, 2000.

  • Bachor, HA, Taubman, MS, Ralph, TC, Harb, CC, White, AG and McClelland, DE (1996). Experiments and theory of laser noise: Consequences for squeezing and injection locking. In: Bagayev, SN and Chirkin, AS, Atomic and Quantum Optics: High-Precision Measurements. ICONO 95 Conference - Atomic and Quantum Optics: High-Precision Measurements, St Petersburg Russia, (157-163). Jun 27-Jul 01, 1995. doi:10.1117/12.239824

  • Bachor, HA, Ralph, TC, Taubman, MS, White, AG, Harb, CC and McClelland, DE (1995). Progress in the Search for the Optimum Light-Source - Squeezing Experiments with a Frequency Doubler. In: Quantum and Semiclassical Optics. Workshop on Non-Classical Light/Satellite Meeting on Application of Techniques and Methods of Non-Classical Light - Gravitational Wave Detection, Quantum Cryptography and Quantum Computing, Corvara Italy, (715-726). Jan 28-Feb 04, 1995. doi:10.1088/1355-5111/7/4/024

Other Outputs

Grants (Administered at UQ)

PhD and MPhil Supervision

Current Supervision

  • Doctor Philosophy — Principal Advisor

    Other advisors:

  • Doctor Philosophy — Principal Advisor

    Other advisors:

  • Doctor Philosophy — Principal Advisor

    Other advisors:

  • Doctor Philosophy — Principal Advisor

    Other advisors:

  • Doctor Philosophy — Principal Advisor

  • Doctor Philosophy — Principal Advisor

    Other advisors:

  • Doctor Philosophy — Principal Advisor

Completed Supervision