Dr Fabio Costa

UQ Amplify Researcher

Mathematics
Faculty of Science
f.costa@uq.edu.au
+61 7 336 57415

Overview

Dr Fabio Costa's research interests are in the fields of foundations of quantum physics and quantum information theory.

Fabio Costa has obtained a PhD in Theoretical Physics at the University of Vienna in 2013 for research on quantum reference frames, entanglement in quantum field theory, and quantum causal structures, working under the supervision of Professor Časlav Brukner. He moved to the University of Queensland as a postdoctoral researcher in 2014. He is currently an ARC DECRA Research Fellow at the University of Queensland. He works on developing methods for the discovery and the control of causal structures in quantum systems, with applications to quantum technology and to the joint foundations of quantum theory and gravity.

Qualifications

  • Doctor of Philosophy, University of Vienna

Publications

  • Jia, Ding and Costa, Fabio (2019). Causal order as a resource for quantum communication. Physical Review A, 100 (5) 052319, doi:10.1103/PhysRevA.100.052319

  • Zych, Magdalena, Costa, Fabio, Pikovski, Igor and Brukner, Časlav (2019). Bell’s theorem for temporal order. Nature Communications, 10 (1) 3772, doi:10.1038/s41467-019-11579-x

  • Goswami, K., Giarmatzi, C., Kewming, M., Costa, F., Branciard, C., Romero, J. and White, A. G. (2018). Indefinite causal order in a quantum switch. Physical Review Letters, 121 (9) 090503, doi:10.1103/physrevlett.121.090503

  • Costa, Fabio and Shrapnel, Sally (2016). Quantum causal modelling. New Journal of Physics, 18 (6) 063032, doi:10.1088/1367-2630/18/6/063032

  • Araujo, Mateus, Costa, Fabio and Brukner, Caslav (2014). Computational advantage from quantum-controlled ordering of gates. Physical Review Letters, 113 (25) 250402, 250402-1-250402-5. doi:10.1103/PhysRevLett.113.250402

  • Oreshkov, Ognyan, Costa, Fabio and Brukner, Caslav (2012). Quantum correlations with no causal order. Nature Communications, 3 (1) 1092, doi:10.1038/ncomms2076

View all Publications

Grants

View all Grants

Supervision

  • Doctor Philosophy

  • Doctor Philosophy

  • Doctor Philosophy

View all Supervision

Available Projects

  • All fundamental interactions known in nature are local: only close-by systems can interact. But where does the very notion of closeness come from? Ultimately, we only learn about spatial relations through physical systems, it should thus be possible to understand the locality of interactions without pre-assuming the existence of an absolute space.

    The aim of the project is to derive the local structure of quantum systems from properties of dynamics alone, with no reference to any underlying geometry. Formally, the task is to derive a decomposition of Hilbert space in tensor factors, with each factor representing a local subsystem, from basis-independent properties of the Hamiltonian.

    Available as Honours Project.

  • Quantum information has developed in the last decades into a broad field, offering several promising applications for future technology and deep insights into the foundations of physics. Very recently, first steps have been made in the direction of theoretically characterising and experimentally manipulating causal relations between quantum systems from an information-theoretical perspective. The motivations are two-fold: from a foundational perspective, it is expected that the notion of definite, classical causal structure would not survive in a theory where gravity, and thus space-time, are subject to quantum effects. More practically, it has been proposed that quantum causal relations can also be realised in laboratory experiments and that they can provide advantage for several tasks, such as computation and communication complexity.

    As this is a very new field, it still needs development of basic tools and exemplary protocols. To name but a few possibilities:

    · Communication: how does indefinite causal structure affect the possibility of communicating classical or quantum information?

    · Discrimination of causal structure: Given a set of events and some prior information about their causal relations, what are the optimal protocols for inferring the causal structure?

    · Teleportation of causal structure: is it possible to exploit “entangled causal relations” to effectively teleport an unknown causal structure from a set of events to another?

    · Information measures on indefinite causal structure: what are meaningful ways to quantify information encoded in systems with indefinite causal structure? Is it possible to quantify information about the causal structure itself?

    The aim of the project is to develop some of these tools, having in mind potential applications to information-theoretical tasks, quantum technologies, or foundational questions.

    Available both as Honours or PhD Project.

View all Available Projects

Publications

Featured Publications

  • Jia, Ding and Costa, Fabio (2019). Causal order as a resource for quantum communication. Physical Review A, 100 (5) 052319, doi:10.1103/PhysRevA.100.052319

  • Zych, Magdalena, Costa, Fabio, Pikovski, Igor and Brukner, Časlav (2019). Bell’s theorem for temporal order. Nature Communications, 10 (1) 3772, doi:10.1038/s41467-019-11579-x

  • Goswami, K., Giarmatzi, C., Kewming, M., Costa, F., Branciard, C., Romero, J. and White, A. G. (2018). Indefinite causal order in a quantum switch. Physical Review Letters, 121 (9) 090503, doi:10.1103/physrevlett.121.090503

  • Costa, Fabio and Shrapnel, Sally (2016). Quantum causal modelling. New Journal of Physics, 18 (6) 063032, doi:10.1088/1367-2630/18/6/063032

  • Araujo, Mateus, Costa, Fabio and Brukner, Caslav (2014). Computational advantage from quantum-controlled ordering of gates. Physical Review Letters, 113 (25) 250402, 250402-1-250402-5. doi:10.1103/PhysRevLett.113.250402

  • Oreshkov, Ognyan, Costa, Fabio and Brukner, Caslav (2012). Quantum correlations with no causal order. Nature Communications, 3 (1) 1092, doi:10.1038/ncomms2076

Journal Article

  • Jia, Ding and Costa, Fabio (2019). Causal order as a resource for quantum communication. Physical Review A, 100 (5) 052319, doi:10.1103/PhysRevA.100.052319

  • Baumeler, Ämin, Costa, Fabio, Ralph, Timothy C, Wolf, Stefan and Zych, Magdalena Anna (2019). Reversible time travel with freedom of choice. Classical and Quantum Gravity, 36 (22) 224002, doi:10.1088/1361-6382/ab4973

  • Zych, Magdalena, Costa, Fabio, Pikovski, Igor and Brukner, Časlav (2019). Bell’s theorem for temporal order. Nature Communications, 10 (1) 3772, doi:10.1038/s41467-019-11579-x

  • Shrapnel, Sally, Costa, Fabio and Milburn, Gerard (2018). Quantum Markovianity as a supervised learning task. International Journal of Quantum Information, 16 (08) 1840010, doi:10.1142/s0219749918400105

  • Goswami, K., Giarmatzi, C., Kewming, M., Costa, F., Branciard, C., Romero, J. and White, A. G. (2018). Indefinite causal order in a quantum switch. Physical Review Letters, 121 (9) 090503, doi:10.1103/physrevlett.121.090503

  • Ringbauer, Martin, Costa, Fabio, Goggin, Michael E., White, Andrew G. and Fedrizzi, Alessandro (2018). Multi-time quantum correlations with no spatial analog. npj Quantum Information, 4 (1) 37, doi:10.1038/s41534-018-0086-y

  • Costa, Fabio, Ringbauer, Martin, Goggin, Michael E., White, Andrew G. and Fedrizzi, Alessandro (2018). Unifying framework for spatial and temporal quantum correlations. Physical Review A, 98 (1) 012328, doi:10.1103/PhysRevA.98.012328

  • Shrapnel, Sally and Costa, Fabio (2018). Causation does not explain contextuality. Quantum, 263, doi:10.22331/q-2018-05-18-63

  • Shrapnel, Sally, Costa, Fabio and Milburn, Gerard (2018). Updating the Born rule. New Journal of Physics, 20 (5) 053010, doi:10.1088/1367-2630/aabe12

  • Giarmatzi, Christina and Costa, Fabio (2018). A quantum causal discovery algorithm. Npj Quantum Information, 4 (1) 17, doi:10.1038/s41534-018-0062-6

  • Abbott, Alastair A., Wechs, Julian, Costa, Fabio and Branciard, Cyril (2017). Genuinely multipartite noncausality. Quantum, 139, doi:10.22331/q-2017-12-14-39

  • Pikovski, Igor, Zych, Magdalena, Costa, Fabio and Brukner, Časlav (2017). Time dilation in quantum systems and decoherence. New Journal of Physics, 19 (2) 025011, doi:10.1088/1367-2630/aa5d92

  • Abbott, Alastair A., Giarmatzi, Christina, Costa, Fabio and Branciard, Cyril (2016). Multipartite causal correlations: polytopes and inequalities. Physical Review A, 94 (3) 032131, 032131-1-032131-12. doi:10.1103/PhysRevA.94.032131

  • Ringbauer, Martin, Giarmatzi, Christina, Chaves, Rafael, Costa, Fabio, White, Andrew G. and Fedrizzi, Alessandro (2016). Experimental test of nonlocal causality. Science Advances, 2 (8) e1600162, doi:10.1126/sciadv.1600162

  • Costa, Fabio and Shrapnel, Sally (2016). Quantum causal modelling. New Journal of Physics, 18 (6) 063032, doi:10.1088/1367-2630/18/6/063032

  • Pikovski, Igor, Zych, Magdalena, Costa, Fabio and Brukner, Caslav (2016). Reply to 'Questioning universal decoherence due to gravitational time dilation'. Nature Physics, 12 (1) 2-3. doi:10.1038/nphys3650

  • Branciard, Cyril Branciard, Araujo, Mateus, Feix, Adrien, Costa, Fabio and Brukner, Caslav (2015). The simplest causal inequalities and their violation. New Journal of Physics, 18 (1) 013008, doi:10.1088/1367-2630/18/1/013008

  • Araujo, Mateus, Branciard, Cyril, Costa, Fabio, Feix, Adrien, Giarmatzi, Christina and Brukner, Caslav (2015). Witnessing causal nonseparability. New Journal of Physics, 17 (10) 102001, doi:10.1088/1367-2630/17/10/102001

  • Procopio, Lorenzo M., Moqanaki, Amir, Araujo, Mateus, Costa, Fabio, Calafell, Irati A., Dowd, Emma G., Hamel, Dendy R., Rozema, Lee A., Brukner, Caslav and Walther, Philip (2015). Experimental superposition of orders of quantum gates. Nature Communications, 6 (7913) 7913, 1-6. doi:10.1038/ncomms8913

  • Pikovski, Igor, Zych, Magdalena, Costa, Fabio and Brukner, Caslav (2015). Universal decoherence due to gravitational time dilation. Nature Physics, 11 (8) 668-672. doi:10.1038/nphys3366

  • Araujo, Mateus, Costa, Fabio and Brukner, Caslav (2014). Computational advantage from quantum-controlled ordering of gates. Physical Review Letters, 113 (25) 250402, 250402-1-250402-5. doi:10.1103/PhysRevLett.113.250402

  • Ibnouhsein, Issam, Costa, Fabio and Grinbaum, Alexei (2014). Renormalized entropy of entanglement in relativistic field theory. Physical Review D, 90 (6) 065032, doi:10.1103/PhysRevD.90.065032

  • Araujo, Mateus, Feix, Adrien, Costa, Fabio and Brukner, Caslav (2014). Quantum circuits cannot control unknown operations. New Journal of Physics, 16 (9) 093026, doi:10.1088/1367-2630/16/9/093026

  • Zych, Magdalena, Costa, Fabio, Pikovski, Igor, Ralph, Timothy C. and Brukner, Caslav (2012). General relativistic effects in quantum interference of photons. Classical and Quantum Gravity, 29 (22) 224010, 224010-1-224010-18. doi:10.1088/0264-9381/29/22/224010

  • Oreshkov, Ognyan, Costa, Fabio and Brukner, Caslav (2012). Quantum correlations with no causal order. Nature Communications, 3 (1) 1092, doi:10.1038/ncomms2076

  • Zych, Magdalena, Costa, Fabio, Pikovski, Igor and Brukner, Caslav (2011). Quantum interferometric visibility as a witness of general relativistic proper time. Nature Communications, 2 (1) 505, doi:10.1038/ncomms1498

  • Zych, Magdalena, Costa, Fabio, Kofler, Johannes and Brukner, Caslav (2010). Entanglement between smeared field operators in the Klein-Gordon vacuum. Physical Review D: covering particles, fields, gravitation, and cosmology, 81 (12) 125019, doi:10.1103/PhysRevD.81.125019

  • Costa, Fabio, Harrigan, Nicholas, Rudolph, Terry and Brukner, Caslav (2009). Entanglement detection with bounded reference frames. New Journal of Physics, 11 (12) 123007, doi:10.1088/1367-2630/11/12/123007

  • Costa, Fabio and Piazza, Federico (2009). Modeling a particle detector in field theory. New Journal of Physics, 11 (11) 113006, doi:10.1088/1367-2630/11/11/113006

  • Cacciatori, Sergio L., Costa, Fabio and Piazza, Federico (2009). Renormalized thermal entropy in field theory. Physical Review D, 79 (2) 025006, doi:10.1103/PhysRevD.79.025006

Conference Publication

  • Romero, Jacquiline, Goswami, Kaumudibikash, Giarmatzi, Christina, Costa, Fabio, Branciard, Cyril and White, Andrew G. (2018). Spatial modes for testing indefinite causal order. Complex Light and Optical Forces XII 2018, San Francisco, CA, United States, 30 January - 1 February 2018. Bellingham, WA, United States :SPIE. doi: 10.1117/12.2292732

  • Ringbauer, M., Giarmatzi, C., Chaves, R., Costa, F., White, A. G. and Fedrizzi, A. (2017). Experimental test of nonlocal causality. 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.2017.8087316

  • Zych, M., Pikovski, I., Costa, F. and Brukner, C. (2016). General relativistic effects in quantum interference of "clocks". 8th Symposium on Frequency Standards and Metrology 2015, Potsdam, Germany, 12 - 16 October 2015. Bristol, United Kingdom :Institute of Physics Publishing. doi: 10.1088/1742-6596/723/1/012044

  • Procopio, L. M., Moqanaki, A., Araújo, M., Costa, F., Calafell, I. A., Dowd, E. G., Hamel, D. R., Rozema, L. A., Brukner, C. and Walther, P. (2014). Experimental superposition of orders of quantum gates. European Quantum Electronics Conference , Munich, Germany, 21–25 June 2015. OSA - The Optical Society.

  • Piazza, Federico and Costa, Fabio (2007). Volumes of space as subsystems.

Grants (Administered at UQ)

PhD and MPhil Supervision

Current Supervision

Completed Supervision

Possible Research Projects

Note for students: The possible research projects listed on this page may not be comprehensive or up to date. Always feel free to contact the staff for more information, and also with your own research ideas.

  • All fundamental interactions known in nature are local: only close-by systems can interact. But where does the very notion of closeness come from? Ultimately, we only learn about spatial relations through physical systems, it should thus be possible to understand the locality of interactions without pre-assuming the existence of an absolute space.

    The aim of the project is to derive the local structure of quantum systems from properties of dynamics alone, with no reference to any underlying geometry. Formally, the task is to derive a decomposition of Hilbert space in tensor factors, with each factor representing a local subsystem, from basis-independent properties of the Hamiltonian.

    Available as Honours Project.

  • Quantum information has developed in the last decades into a broad field, offering several promising applications for future technology and deep insights into the foundations of physics. Very recently, first steps have been made in the direction of theoretically characterising and experimentally manipulating causal relations between quantum systems from an information-theoretical perspective. The motivations are two-fold: from a foundational perspective, it is expected that the notion of definite, classical causal structure would not survive in a theory where gravity, and thus space-time, are subject to quantum effects. More practically, it has been proposed that quantum causal relations can also be realised in laboratory experiments and that they can provide advantage for several tasks, such as computation and communication complexity.

    As this is a very new field, it still needs development of basic tools and exemplary protocols. To name but a few possibilities:

    · Communication: how does indefinite causal structure affect the possibility of communicating classical or quantum information?

    · Discrimination of causal structure: Given a set of events and some prior information about their causal relations, what are the optimal protocols for inferring the causal structure?

    · Teleportation of causal structure: is it possible to exploit “entangled causal relations” to effectively teleport an unknown causal structure from a set of events to another?

    · Information measures on indefinite causal structure: what are meaningful ways to quantify information encoded in systems with indefinite causal structure? Is it possible to quantify information about the causal structure itself?

    The aim of the project is to develop some of these tools, having in mind potential applications to information-theoretical tasks, quantum technologies, or foundational questions.

    Available both as Honours or PhD Project.