Professor Timothy Ralph
Professor

Timothy Ralph

Email: 
Phone: 
+61 7 334 69693

Background

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 Excellence for Quantum Computation and Communication Technology at the University of Queensland.

Availability

Professor Timothy Ralph is:
Available for supervision
Media expert

Fields of research

Physical Sciences

Qualifications

  • Bachelor (Honours) of Science (Advanced), Macquarie University
  • Doctor of Philosophy, Australian National University

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.

Search Professor Timothy Ralph’s works on UQ eSpace

435 works between 1991 and 2025
All (435) Journal Article (330) Book Chapter (7) Conference Publication (88) Book (2) Other Outputs (8)

161 - 180 of 435 works

2013

Conference Publication

Virtual noiseless amplification

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

Virtual noiseless amplification

2013

Conference Publication

Experimental bosonsampling in a photonic circuit

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. IEEE Photonics Society Summer Topical Meeting Series, PSSTMS 2013, Waikoloa, HI, United States, 8 - 10 July 2013. Piscataway, NJ, United States: IEEE. doi: 10.1109/PHOSST.2013.6614564

Experimental bosonsampling in a photonic circuit

2013

Journal Article

Quantum communication with an accelerated partner

Downes, T. G., Ralph, T. C. and Walk, N. (2013). Quantum communication with an accelerated partner. Physical Review A, 87 (1) 012327, 012327.1-012327.7. doi: 10.1103/PhysRevA.87.012327

Quantum communication with an accelerated partner

2013

Conference Publication

Direct characterization of any linear photonic device

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. Conference on Lasers and Electro-Optics Europe & International Quantum Electronics Conference (CLEO/Europe-IQEC), Munich, Germany, 12-16 May, 2013. Piscataway, NJ, USA: IEEE. doi: 10.1109/CLEOE-IQEC.2013.6801733

Direct characterization of any linear photonic device

2012

Journal Article

Relativistic quantum information

Mann, R. B. and Ralph, T. C. (2012). Relativistic quantum information. Classical and Quantum Gravity, 29 (22), 220301. doi: 10.1088/0264-9381/29/22/220301

Relativistic quantum information

2012

Journal Article

General relativistic effects in quantum interference of photons

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

General relativistic effects in quantum interference of photons

2012

Journal Article

Quantum-enhanced optical-phase tracking

Yonezawa, Hidehiro, Nakane, Daisuke, Wheatley, Trevor A., Iwasawa, Kohjiro, Takeda, Shuntaro, Arao, Hajime, Ohki, Kentaro, Tsumura, Koji, Berry, Dominic W., Ralph, Timothy C., Wiseman, Howard M., Huntington, Elanor H. and Furusawa, Akira (2012). Quantum-enhanced optical-phase tracking. Science, 337 (6101), 1514-1517. doi: 10.1126/science.1225258

Quantum-enhanced optical-phase tracking

2012

Journal Article

Observing the operational significance of discord consumption

Gu, Mile, Chrzanowski, Helen M., Assad, Syed M., Symul, Thomas, Modi, Kavan, Ralph, Timothy C., Vedral, Vlatko and Lam, Ping Koy (2012). Observing the operational significance of discord consumption. Nature Physics, 8 (9), 671-675. doi: 10.1038/NPHYS2376

Observing the operational significance of discord consumption

2012

Journal Article

Continuous-variable quantum key distribution using thermal states

Weedbrook, Christian, Pirandola, Stefano and Ralph, Timothy C. (2012). Continuous-variable quantum key distribution using thermal states. Physical Review A, 86 (2) 022318, 022318.1-022318.12. doi: 10.1103/PhysRevA.86.022318

Continuous-variable quantum key distribution using thermal states

2012

Journal Article

Entanglement dynamics and quasi-periodicity in discrete quantum walks

Rohde, Peter P., Fedrizzi, Alessandro and Ralph, Timothy C. (2012). Entanglement dynamics and quasi-periodicity in discrete quantum walks. Journal of Modern Optics, 59 (8), 710-720. doi: 10.1080/09500340.2012.660204

Entanglement dynamics and quasi-periodicity in discrete quantum walks

2012

Journal Article

Gaussian quantum information

Weedbrook, Christian, Pirandola, Stefano, Garcia-Patron, Raul, Cerf, Nicolas J., Ralph, Timothy C., Shapiro, Jeffrey H. and Lloyd, Seth (2012). Gaussian quantum information. Reviews of Modern Physics, 84 (2), 621-669. doi: 10.1103/RevModPhys.84.621

Gaussian quantum information

2012

Journal Article

Error tolerance of the boson-sampling model for linear optics quantum computing

Rohde, Peter P. and Ralph, Timothy C. (2012). Error tolerance of the boson-sampling model for linear optics quantum computing. Physical Review A, 85 (2) 022332, 022332.1-022332.5. doi: 10.1103/PhysRevA.85.022332

Error tolerance of the boson-sampling model for linear optics quantum computing

2012

Journal Article

Extraction of timelike entanglement from the quantum vacuum

Olson, S. Jay and Ralph, Timothy C. (2012). Extraction of timelike entanglement from the quantum vacuum. Physical Review A, 85 (1) 012306, 012306-1-012306-7. doi: 10.1103/PhysRevA.85.012306

Extraction of timelike entanglement from the quantum vacuum

2012

Journal Article

Relativistic quantum information and time machines

Ralph, Timothy C. and Downes, Tony G. (2012). Relativistic quantum information and time machines. Contemporary Physics, 53 (1), 1-16. doi: 10.1080/00107514.2011.640146

Relativistic quantum information and time machines

2011

Journal Article

Quantum fields on closed timelike curves

Pienaar, J.L., Myers, C.R. and Ralph, T.C. (2011). Quantum fields on closed timelike curves. Physical Review A: Atomic, molecular and optical physics, 84 (6) 062316, 062316. doi: 10.1103/PhysRevA.84.062316

Quantum fields on closed timelike curves

2011

Conference Publication

Continuous variable quantum key distribution: Security, repeaters and relativity

Walk, Nathan, Ralph, Timothy C., Downes, Tony, Symul, Thomas and Lam, Ping Koy (2011). Continuous variable quantum key distribution: Security, repeaters and relativity. Washington, D.C.: Optical Society of America (OSA). doi: 10.1364/icqi.2011.qmf4

Continuous variable quantum key distribution: Security, repeaters and relativity

2011

Journal Article

Photon-number discrimination without a photon counter and its application to reconstructing non-Gaussian states

Chrzanowski, H. M., Bernu, J., Sparkes, B. M., Hage, B., Lund, A. P., Ralph, T. C., Lam, P. K. and Symul, T. (2011). Photon-number discrimination without a photon counter and its application to reconstructing non-Gaussian states. Physical Review A (Atomic, Molecular and Optical Physics), 84 (5) 050302, 050302.1-050302.4. doi: 10.1103/PhysRevA.84.050302

Photon-number discrimination without a photon counter and its application to reconstructing non-Gaussian states

2011

Journal Article

Coherent state topological cluster state production

Myers, C. R. and Ralph, T. C. (2011). Coherent state topological cluster state production. New Journal of Physics, 13 (11) 115015, 1-24. doi: 10.1088/1367-2630/13/11/115015

Coherent state topological cluster state production

2011

Journal Article

Reply to "Comment on 'Information flow of quantum states interacting with closed timelike curves"

Ralph, T.C. and Myers, C.R. (2011). Reply to "Comment on 'Information flow of quantum states interacting with closed timelike curves". Physical Review A, 84 (5) 056302, 056302-1-056302-2. doi: 10.1103/PhysRevA.84.056302

Reply to "Comment on 'Information flow of quantum states interacting with closed timelike curves"

2011

Journal Article

Quantum error correction of continuous-variable states against Gaussian noise

Ralph, T. C. (2011). Quantum error correction of continuous-variable states against Gaussian noise. Physical Review A, 84 (2) 022339, 022339-1-022339-4. doi: 10.1103/PhysRevA.84.022339

Quantum error correction of continuous-variable states against Gaussian noise

Current funding

  • 2024 - 2027
    Deployable Quantum Relay (DSP Multi-Party Collaborative Project led by Griffith University)
    Commonwealth Defence Science and Technology Group
    Open grant
  • 2018 - 2025
    ARC Centre of Excellence for Quantum Computation and Communication Technology (CQC2T) (ARC Centre of Excellence administered by UNSW)
    University of New South Wales
    Open grant

Past funding

  • 2023 - 2025
    Quantum Communications with Continuous Variables (UNSW subcontract agreement)
    University of New South Wales
    Open grant
  • 2021 - 2024
    A Space-Based Quantum Communications Platform using Continuous Variables (ARC Linkage Project led by University of NSW)
    University of New South Wales
    Open grant
  • 2019 - 2021
    Enabling quantum information technology with 60 photons and beyond
    United States Asian Office of Aerospace Research and Development
    Open grant
  • 2019 - 2020
    Platform independent studies on optimising quantum repeater architectures (Australian Department of Defence grant administered by QuintessenceLabs Pty Ltd)
    Quintessencelabs Pty Ltd
    Open grant
  • 2017 - 2020
    Quantum Key Distribution (QKD) System
    Quintessencelabs Pty Ltd
    Open grant
  • 2011 - 2018
    ARC Centre of Excellence for Quantum Computation and Communication Technology (ARC COE administered by the University of New South Wales)
    University of New South Wales
    Open grant
  • 2011 - 2013
    Quantum Optics and Quantum Information
    Vice-Chancellor's Senior Research Fellowship
    Open grant
  • 2010
    Quantum memory
    Australian National University
    Open grant
  • 2008 - 2012
    Quantum repeater technologies for continuous variable (ARC Discovery Project DP0879277 administered by ANU)
    Australian National University
    Open grant
  • 2006 - 2009
    Theoretical studies in quantum information
    Department Defence - Defence Science & Technology
    Open grant
  • 2006 - 2010
    Optical Quantum Computation
    ARC Discovery Projects
    Open grant
  • 2003 - 2010
    ARC Centre of Excellence for Quantum Computer Technology (UNSW lead institution)
    ARC Centres of Excellence
    Open grant
  • 2003 - 2005
    Quantum Photonics- Travel Award
    Australian National University
    Open grant
  • 2002 - 2004
    Towards Quantum Computation with Light
    UQ Foundation Research Excellence Awards - DVC(R) Funding
    Open grant
  • 2002 - 2004
    ARC Discovery Project - Quantum Photonics with continuous laser beams
    Australian National University
    Open grant
  • 2001 - 2004
    Experimental Implementation of Efficient Linear Optics Quantum Computation
    United States Army Research Office
    Open grant
  • 2000
    Optical entangler for Quantum Communication
    Australian National University
    Open grant
  • 2000 - 2005
    Quantum Information with Continuous Variables
    ARC Australian Research Fellowship/QEII F/ship
    Open grant
  • 2000
    Quantum information with continuous variables
    UQ New Staff Research Start-Up Fund
    Open grant

Availability

Professor Timothy Ralph is:
Available for supervision

Before you email them, read our advice on how to contact a supervisor.

Supervision history

Current supervision

  • Doctor Philosophy

    Beyond quantum field theory on a curved background

    Principal Advisor

  • Doctor Philosophy

    Production of quantum communication systems capable of operating onboard low-earth orbit satellites and developing integrated quantum and classical satellite communication protocols.

    Principal Advisor

  • Doctor Philosophy

    Quantum information processing with linear optics

    Principal Advisor

  • Master Philosophy

    Resolving paradoxes of closed timelike curves

    Principal Advisor

  • Doctor Philosophy

    Thermodynamic fluctuation relations for gravitating quantum systems

    Associate Advisor

    Other advisors: Dr Carolyn Wood

  • Doctor Philosophy

    Demonstration of relativistic Bohmian trajectories of photons

    Associate Advisor

    Other advisors: Associate Professor Jacqui Romero

  • Doctor Philosophy

    Perspectives on the de Broglie-Bohm interpretation

    Associate Advisor

    Other advisors: Associate Professor Sally Shrapnel, Dr Peter Evans

Completed supervision

Enquiries

Contact Professor Timothy Ralph directly for media enquiries about:

  • Laser noise - physics
  • Optics - quantum
  • Physics
  • Quantum information
  • Quantum key distribution with continuous variables
  • Quantum optics
  • Quantum physics
  • Teleportation

Need help?

For help with finding experts, story ideas and media enquiries, contact our Media team:

communications@uq.edu.au