Dr Till Joscha Weinhold

Research Fellow

ARC Centre of Excellence for Engineered Quantum Systems
Faculty of Science
weinhold@physics.uq.edu.au
+61 7 334 67347

Overview

Diplom Physik at University of Potsdam, Germany 1998-2003 (equiv. Masters). PhD Physics at the Unveristy of Queensland, Australia 2004-2007. Postdoctoral Research Fellow at Griffith University, Australia 2007-2010. Postdoctoral Reserach Fellow at the School of Maths and Physics, Univeristy of Queensland Australia 2010-2012. Postdoctoroal Research Fellow with in the ARC Centre of Excellence for Quantum Computation and Communication Technology, and ARC Centre of Excellence for Engineered Quantum Systems. 2012-2017. Postdoctoroal Research Fellow with in the ARC Centre of Excellence for Engineered Quantum Systems. 2018-current.

Research Interests

  • Quantum Memories
    Development of long range quantum communication as well as non-ballistic quantum computation is likely to rely on the use of a Quantum Memory. I am collaborating with the group of Prof. Lam and Prof. Buchler at the Australian National University to develop a quantum memory for light. To this end we have developed a customised single photon source based on cavity enhanced parametric down-conversion. The source is currently at the ANU and is being linked and integrated with their rubidium based gradient echo memory.
  • Nano-fabricated quantum devices for NIR quantum optics
    The best single photon sources to date with the the highest purity photons and quantum indistinguishability are commonly produced at wavelengths just past the visible spectrum (700-1000nm) either through parametric down conversion, or solid-state single photon emitters like quantum dots. Nano-fabricated optical chips and fibre optics however are optimised to the low loss transmission window of the telecommunication industry at 1550nm. They therefore heavily utilise Silicon photonics. Silicon however is a strong absorber at the wavelengths of good quantum sources. We are therefore working on a developing nano-fabricated photonic chips with materials such as SiliconNitride or Lithium Niobate, that have better transparency properties at the NIR wavelengths. Our first targeted applications will by quantum gate circuits and electro optical switches.
  • Improving Single Photon Sources for Quantum Information
    For efficient quantum communication, computation and sensing, creating large states of entangled photons is thought to be an essential resource in quantum optics. Creating these is a difficult task. Utilising different photon generation methods we can optimise the spectral, temporal and spatial features of the photons. To create high quality multi-photon entangled states will require interference between many individually generated photons. We are working on both parametric down conversion sources as well as solids state sources of single photons. By utilising adaptive optics, machine learning and rapid elelctro-optical manipulation we seek to improve both the rate and quality at which informationally interesting photonic states can be created.
  • Bridging the gap between Quantum light sources and the telecomband
    Telecommunication utilises the low absorption band in glass centred around 1550nm. This allows in principle transmission of optical signals on the scale of 100km before amplification is required. While quantum signals can not be amplified, the can be teleported across links in a Quantum network. The longest feasible distance is governed by the loss of single information carriers along the networks paths. However as the majority of optical sources of qubits are operating at wavelengths between 700-1000nm, the absorption in existing fibre networks is much higher for these signals and achivable distances are much lower. To bridge this gap, we seek to transfer the quantum signal through efficient four wave mixing from wavelengths at 795nm to 1530nm via four-wave mixing in Rubidium. While usually of low efficiency due to the low interaction volume and optical densities in gas cells, we seek to improve the efficiency by operating with Rb filled hollow core fibres in a collaboration with Researchers at IPAS at the University of Adelaide.

Qualifications

  • Doctor of Philosophy, The University of Queensland

Publications

  • Howard, L. A., Gillett, G. G., Pearce, M. E., Abrahao, R. A., Weinhold, T. J., Kok, P. and White, A. G. (2019). Optimal imaging of remote bodies using quantum detectors. Physical Review Letters, 123 (14) 143604, 143604. doi: 10.1103/PhysRevLett.123.143604

  • Howard, L. A., Weinhold, T. J., Shahandeh, F., Combes, J., Vanner, M. R., White, A. G. and Ringbauer, M. (2019). Quantum hypercube states. Physical Review Letters, 123 (2) 020402, 020402. doi: 10.1103/PhysRevLett.123.020402

  • Rambach, M., Lau, W. Y. S., Laibacher, S., Tamma, V., White, A. G. and Weinhold, T. J. (2019). Hectometer revivals of quantum interference. 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO® /Europe-EQEC), Munich, Germany, 23-27 June 2019. Piscataway, NJ USA: Institute of Electrical and Electronics Engineers. doi: 10.1109/CLEOE-EQEC.2019.8871498

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Grants

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Supervision

  • Doctor Philosophy

  • Doctor Philosophy

  • Doctor Philosophy

View all Supervision

Publications

Journal Article

Conference Publication

  • Rambach, M., Lau, W. Y. S., Laibacher, S., Tamma, V., White, A. G. and Weinhold, T. J. (2019). Hectometer revivals of quantum interference. 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO® /Europe-EQEC), Munich, Germany, 23-27 June 2019. Piscataway, NJ USA: Institute of Electrical and Electronics Engineers. doi: 10.1109/CLEOE-EQEC.2019.8871498

  • Weinhold, T. J., Howard, L. A., Combes, J., Shahandeh, F., Vanner, M. R., Ringbauer, M. and White, A. G. (2019). Hypercube states for sub-planck sensing. Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), Munich, Germany, 23-27 June 2019. Piscataway, NJ, United States: Institute of Electrical and Electronics Engineers. doi: 10.1109/CLEOE-EQEC.2019.8871669

  • Lau, W. Y. Sarah, Leung, Anthony C., Paul, Karun V., Tranter, Aaron D., Campbell, Geoff T., Weinhold, Till J., Lam, Ping Koy, White, Andrew G. and Buchler, Ben C. (2019). Towards storage of sub-megahertz single photons in gradient echo memory. Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), Munich, Germany, 23-27 June 2019. Piscataway, NJ, United States: Institute of Electrical and Electronics Engineers . doi: 10.1109/CLEOE-EQEC.2019.8872280

  • Abrahão, Raphael A., Shahandeh, Farid, Gillett, Geoff, Ringbauer, Martin, Weinhold, Till, Almeida, Marcelo P., Ralph, Timothy C. and White, Andrew G. (2018). The quest for nonclassicality using number-resolving single-photon detectors. Frontiers in Optics, FIO 2018, Washington, DC USA, 18-20 September 2018. OSA - The Optical Society. doi: 10.1364/FIO.2018.JTu2A.55

  • Ringbauer, M., Weinhold, T. J., White, A. G. and Vanner, M. R. (2017). Generation of mechanical interference fringes by multi-photon quantum measurement. Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Munich, Germany, 25-29 June 2017. Piscataway, NJ, United States: IEEE. doi: 10.1109/CLEOE-EQEC.2017.8087385

  • Rambach, Markus, Lau, Wing Yung Sarah, Nikolova, Aleksandrina, Weinhold, Till and White, Andrew (2017). Sub-megahertz linewidth single photon source suitable for quantum memories. European Quantum Electronics Conference, EQEC 2017, Munich, Germany, 25-29 June 2017. Washington, DC USA: OSA - The Optical Society.

  • Rambach, Markus, Lau, Wing Yung Sarah, Nikolova, Aleksandrina, Weinhold, Till and White, Andrew (2017). Sub-megahertz linewidth single photon source suitable for quantum memories. 2017 Conference on Lasers and Electro-Optics, CLEO 2017, California, USA, May 14-19, 2017. NEW YORK: Institute of Electrical and Electronics Engineers . doi: 10.1364/CLEO_QELS.2017.FTh4E.5

  • Weinhold, Till J., Smith, Devin H., Gillett, Geoff, De Almeida, Marcelo P., Branciard, Cyril, Fedrizzi, Alessandro, Lita, Adriana, Calkins, Brice, Gerrits, Thomas, Nam, Sae Woo and White, Andrew G. (2012). Detection loophole free quantum steering with photons. Quantum Information and Measurement, Berlin, Germany, 19–21 March 2012. Washington, D.C.: OSA. doi: 10.1364/QIM.2012.QW1A.2

  • Weinhold, Till J., Broom, Matthew A. and White, A. G. (2011). Creating narrow-band single photons suitable for gradient echo quantum memories. International Quantum Electronics Conference, IQEC 2011 and Conference on Lasers and Electro-Optics, CLEO Pacific Rim 2011, Sydney, NSW Australia, 28 August - 1 September 2011. Piscataway, NJ United States: I E E E. doi: 10.1109/IQEC-CLEO.2011.6194107

  • Streed, E. W., Norton, B. G., Weinhold, T. J. and Kielpinski, D. (2011). Imaging trapped ions with an integrated microfabricated optic. 10th International Conference on Quantum Communication, Measurement and Computing (QCMC), Brisbane, Australia, 19-23 July 2010. Melville, NY, United States: American Institute of Physics. doi: 10.1063/1.3630177

  • Lanyon, B. P., Weinhold, T. J., Langford, N. K., Barbieri, M., de Almeida, M. P., Gilchrist, A., James, D. F. V. and White, A. G. (2008). Photonic Quantum Computing: Shor's Algorithm and the Road to Fault-Tolerance. Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference, San Jose, United States, 4-9 May 2008. Piscataway, NJ, United States: IEEE. doi: 10.1109/QELS.2008.4553035

  • White, A. G., Pereira De Almeida, M., Barbieri, M., Biggerstaff, D. N., Dalton, R. B., Gilchrist, A., Gillett, G., James, D. F. V., Langford, N. K., Lanyon, B. N., Resch, K. J. and Weinhold, T. J. (2007). Efficient quantum-logic circuits: Or, how i learned to stop worrying and love hilbert space. Laser Science, LS 2007, San Jose, CA United States, 16 September 2007. Optical Society of America.

  • Langford, N. K., Weinhold, T. J., Pryde, G. J., O'Brien, J. L. and White A. G. (2005). Entangling linear optics gates for bell-state analysis and entangled cluster-state generation. Quantum Electronics and Laser Science Conference, QELS 2005, Baltimore, MD United States, 22- 27 May 2005. Piscataway, NJ United States: IEEE. doi: 10.1109/QELS.2005.1548779

  • Weinhold, T., SeiB, M. , Kunstler, W. , Gome, T. and Gerhard-Multhaupt, R. (2000). Porous polytetrafluoroethylene (PTFE) single-film space-charge electrets with high piezoelectric coefficients. International Conference on Dielectric Materials, Measurements and Applications, Edinburgh, Scotland, 17-21 September 2000. Piscataway, NJ, United States: IEE. doi: 10.1049/cp:20000537

Other Outputs

Grants (Administered at UQ)

PhD and MPhil Supervision

Current Supervision

Completed Supervision