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)

421 - 429 of 429 works

1995

Journal Article

Squeezed-Light From 2nd-Harmonic Generation - Experiment Versus Theory

Ralph, TC, Taubman, MS, White, AG, McClelland, DE and Bachor, HA (1995). Squeezed-Light From 2nd-Harmonic Generation - Experiment Versus Theory. Optics Letters, 20 (11), 1316-1318. doi: 10.1364/OL.20.001316

Squeezed-Light From 2nd-Harmonic Generation - Experiment Versus Theory

1995

Journal Article

Retrieving Squeezing From Classically Noisy Light in 2nd-Harmonic Generation

Ralph, TC and White, AG (1995). Retrieving Squeezing From Classically Noisy Light in 2nd-Harmonic Generation. Journal of the Optical Society of America B-Optical Physics, 12 (5), 833-839. doi: 10.1364/JOSAB.12.000833

Retrieving Squeezing From Classically Noisy Light in 2nd-Harmonic Generation

1994

Journal Article

Bistability in a 4-Level Laser with a Resonant Pump Mode

Ralph, TC (1994). Bistability in a 4-Level Laser with a Resonant Pump Mode. Physical Review a, 49 (6), 4979-4984. doi: 10.1103/PhysRevA.49.4979

Bistability in a 4-Level Laser with a Resonant Pump Mode

1993

Journal Article

High-Power Quenching Resulting From Pump Excited-State Absorption in An Erbium-Doped Fiber Laser

Ralph, TC, Stevenson, AJ, Savage, CM and Bachor, HA (1993). High-Power Quenching Resulting From Pump Excited-State Absorption in An Erbium-Doped Fiber Laser. Optics Letters, 18 (14), 1162-1164. doi: 10.1364/OL.18.001162

High-Power Quenching Resulting From Pump Excited-State Absorption in An Erbium-Doped Fiber Laser

1993

Journal Article

Squeezing From Conventionally Pumped Lasers - a Rate-Equation Approach

Ralph, TC and Savage, CM (1993). Squeezing From Conventionally Pumped Lasers - a Rate-Equation Approach. Quantum Optics, 5 (2), 113-119. doi: 10.1088/0954-8998/5/2/006

Squeezing From Conventionally Pumped Lasers - a Rate-Equation Approach

1992

Journal Article

Producing Squeezed Light From Conventionally Pumped Lasers

Ralph, TC and Savage, CM (1992). Producing Squeezed Light From Conventionally Pumped Lasers. Journal of the Optical Society of America B-Optical Physics, 9 (10), 1895-1903. doi: 10.1364/JOSAB.9.001895

Producing Squeezed Light From Conventionally Pumped Lasers

1992

Journal Article

Squeezed Light From Conventionally Pumped Lasers with Nonuniform Spatial Structure

Savage, CM and Ralph, TC (1992). Squeezed Light From Conventionally Pumped Lasers with Nonuniform Spatial Structure. Physical Review a, 46 (5), 2803-2810. doi: 10.1103/PhysRevA.46.2803

Squeezed Light From Conventionally Pumped Lasers with Nonuniform Spatial Structure

1991

Journal Article

Squeezed light from a coherently pumped four-level laser

Ralph, T. C. and Savage, C. M. (1991). Squeezed light from a coherently pumped four-level laser. Physical Review A, 44 (11), 7809-7814. doi: 10.1103/PhysRevA.44.7809

Squeezed light from a coherently pumped four-level laser

1991

Journal Article

Squeezed Light From Conventionally Pumped Multilevel Lasers

Ralph, TC and Savage, CM (1991). Squeezed Light From Conventionally Pumped Multilevel Lasers. Optics Letters, 16 (14), 1113-1115. doi: 10.1364/OL.16.001113

Squeezed Light From Conventionally Pumped Multilevel Lasers

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

Need help?

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communications@uq.edu.au