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

429 works between 1991 and 2025
All (429) Journal Article (325) Book Chapter (7) Conference Publication (87) Book (2) Other Outputs (8)

381 - 400 of 429 works

2000

Journal Article

Sources of phase noise in an injection-locked solid-state laser

Huntington, EH, Ralph, TC and Zawischa, I (2000). Sources of phase noise in an injection-locked solid-state laser. Journal of the Optical Society of America B-Optical Physics, 17 (2), 280-292. doi: 10.1364/JOSAB.17.000280

Sources of phase noise in an injection-locked solid-state laser

2000

Conference Publication

Quantum key distribution with continuous variables

Ralph, T. C. (2000). Quantum key distribution with continuous variables. QELS 2000, The Moscone Convention Center, San Francisco, California, 7-12 May, 2000. US: Optical Society of America.

Quantum key distribution with continuous variables

2000

Journal Article

Proposal for the measurement of Bell-type correlations from continuous variables

Ralph, T. C., Munro, W. J. and Polkinghorne, R. E. S. (2000). Proposal for the measurement of Bell-type correlations from continuous variables. Physical Review Letters, 85 (10), 2035-2039. doi: 10.1103/PhysRevLett.85.2035

Proposal for the measurement of Bell-type correlations from continuous variables

2000

Journal Article

Continuous variable quantum cryptography

Ralph, T. C. (2000). Continuous variable quantum cryptography. Physical Review A, 61 (1) 010303, 103031-103034. doi: 10.1103/PhysRevA.61.010303

Continuous variable quantum cryptography

2000

Conference Publication

Quantum information with continuous variables

Ralph, T. C. (2000). Quantum information with continuous variables. 2000 IQEC, Nice Acropolis, France, 10-15 September, 2000. US: IEEE.

Quantum information with continuous variables

2000

Journal Article

Franson-type interferometer for intensity fluctuations

Ralph, T. C. (2000). Franson-type interferometer for intensity fluctuations. Journal of Optics B: Quantum and Semiclassical Optics, 2 (6), L31-L34. doi: 10.1088/1464-4266/2/6/101

Franson-type interferometer for intensity fluctuations

2000

Journal Article

Can signal-to-noise be improved by heterodyne detection using an amplitude squeezed local oscillator?

Ralph, T. C. (2000). Can signal-to-noise be improved by heterodyne detection using an amplitude squeezed local oscillator?. Physical Review Letters, 85 (3), 677-677. doi: 10.1103/PhysRevLett.85.677

Can signal-to-noise be improved by heterodyne detection using an amplitude squeezed local oscillator?

2000

Conference Publication

Bell-type correlations from continuous variable measurements

Ralph, T. C., Munro, W. J. and Polkinghorne, R. (2000). Bell-type correlations from continuous variable measurements. AIP 2000, Adelaide University, 10-15 Dec, 2000. Australia: Australian Institute of Physics.

Bell-type correlations from continuous variable measurements

2000

Journal Article

Security of continuous-variable quantum cryptography with Gaussian postselection

Ralph, Timothy C., Symul, Thomas and Lam, Ping Koy (2000). Security of continuous-variable quantum cryptography with Gaussian postselection. Physical Review A, 62 (062306) 062306, 062306-1-062306-7. doi: 10.1103/PhysRevA.62.062306

Security of continuous-variable quantum cryptography with Gaussian postselection

1999

Journal Article

Enhancement of quantum nondemolition measurements with an electro-optic feed-forward amplifier

Buchler, BC, Lam, PK and Ralph, TC (1999). Enhancement of quantum nondemolition measurements with an electro-optic feed-forward amplifier. Physical Review a, 60 (6), 4943-4950. doi: 10.1103/PhysRevA.60.4943

Enhancement of quantum nondemolition measurements with an electro-optic feed-forward amplifier

1999

Journal Article

Scheme for the generation of entangled solitons for quantum communication

Leuchs, G, Ralph, TC, Silberhorn, C and Korolkova, N (1999). Scheme for the generation of entangled solitons for quantum communication. Journal of Modern Optics, 46 (14), 1927-1939. doi: 10.1080/09500349908231382

Scheme for the generation of entangled solitons for quantum communication

1999

Journal Article

Continuous variable entanglement swapping

Polkinghorne, R. E. S. and Ralph, T. C. (1999). Continuous variable entanglement swapping. Physical Review Letters, 83 (11), 2095-2099. doi: 10.1103/PhysRevLett.83.2095

Continuous variable entanglement swapping

1999

Journal Article

Optimization and transfer of vacuum squeezing from an optical parametric oscillator

Lam, PK, Ralph, TC, Buchler, BC, McClelland, DE, Bachor, HA and Gao, J (1999). Optimization and transfer of vacuum squeezing from an optical parametric oscillator. Journal of Optics B-Quantum and Semiclassical Optics, 1 (4), 469-474. doi: 10.1088/1464-4266/1/4/319

Optimization and transfer of vacuum squeezing from an optical parametric oscillator

1999

Journal Article

Characterizing teleportation in optics

Ralph, TC, Lam, PK and Polkinghorne, RES (1999). Characterizing teleportation in optics. Journal of Optics B-Quantum and Semiclassical Optics, 1 (4), 483-489. doi: 10.1088/1464-4266/1/4/321

Characterizing teleportation in optics

1999

Journal Article

Understanding and controlling laser intensity noise

Ralph, TC, Huntington, EH, Harb, CC, Buchler, BC, Lam, PK, Mcclelland, DE and Bachor, HA (1999). Understanding and controlling laser intensity noise. Optical and Quantum Electronics, 31 (5-7), 583-598. doi: 10.1023/A:1006943801659

Understanding and controlling laser intensity noise

1999

Journal Article

Noiseless phase quadrature amplification via an electro-optic feed-forward technique

Buchler, BC, Huntington, EH and Ralph, TC (1999). Noiseless phase quadrature amplification via an electro-optic feed-forward technique. Physical Review a, 60 (1), 529-533. doi: 10.1103/PhysRevA.60.529

Noiseless phase quadrature amplification via an electro-optic feed-forward technique

1999

Journal Article

All-optical quantum teleportation

Ralph, T. C. (1999). All-optical quantum teleportation. Optics Letters, 24 (5), 348-350. doi: 10.1364/OL.24.000348

All-optical quantum teleportation

1999

Journal Article

Suppression of classic and quantum radiation pressure noise by electro-optic feedback

Buchler, BC, Gray, MB, Shaddock, DA, Ralph, TC and McClelland, DE (1999). Suppression of classic and quantum radiation pressure noise by electro-optic feedback. Optics Letters, 24 (4), 259-261. doi: 10.1364/OL.24.000259

Suppression of classic and quantum radiation pressure noise by electro-optic feedback

1999

Conference Publication

Feedback control of the intensity noise of injection locked lasers

Huntington, EH, Harb, CC, Buchler, BC and Ralph, TC (1999). Feedback control of the intensity noise of injection locked lasers. Conference on Laser Resonators II, San Jose Ca, Jan 27-29, 1999. BELLINGHAM: SPIE-INT SOC OPTICAL ENGINEERING. doi: 10.1117/12.349268

Feedback control of the intensity noise of injection locked lasers

1998

Journal Article

Teleportation with bright squeezed light

Ralph, T. C. and Lam, P. K. (1998). Teleportation with bright squeezed light. Physical Review Letters, 81 (25), 5668-5671. doi: 10.1103/PhysRevLett.81.5668

Teleportation with bright squeezed light

Current funding

  • 2024 - 2027
    Deployable Quantum Relay (DSP Multi-Party Collaborative Project led by Griffith University)
    Commonwealth Defence Science and Technology Group
    Open grant
  • 2023 - 2025
    Quantum Communications with Continuous Variables (UNSW subcontract agreement)
    University of New South Wales
    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

  • 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 - 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.

Available projects

  • Optical Quantum Computation

    As part of the Centre for Quantum Computation and Communication Technology we are attempting to understand and implement optical quantum computation using the techniques of linear optic networks and measurement induced state projection. Projects are available examining intemediate scale protocols and algorithms as well as large scale architectures.

  • 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 and squeezed states of light and measuring their amplitudes. Projects concerning quantum repeaters for extending communication links and satellite to ground quantum communication are available.

  • Relativistic quantum information

    Projects are available that involve examining the interface between quantum mechanics, general relativity and information theory. They ask, both at a fundamental and practical level, what the ramifications for quantum information theory are when space-time curvature, rapid motion and/or very fast transformations are introduced.

Supervision history

Current supervision

  • Doctor Philosophy

    Practical applications of quantum sampling algorithms

    Principal Advisor

  • Master Philosophy

    Quantum effects in general relativistic spacetimes

    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

  • Master Philosophy

    Resolving paradoxes of closed timelike curves

    Principal Advisor

  • Doctor Philosophy

    Quantum mechanics near closed timelike curves

    Principal Advisor

  • 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

    Demonstration of relativistic Bohmian trajectories of photons

    Associate Advisor

    Other advisors: Dr Daniel Peace, Associate Professor Jacqui Romero

  • Doctor Philosophy

    Thermodynamic fluctuation relations for gravitating quantum systems

    Associate Advisor

    Other advisors: Dr Carolyn Wood, Dr Laura Henderson

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

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