Stephen Mark Barnett

Department of Physics,
University of Strathclyde,
107 Rottenrow, Glasgow, G4 0NG, Scotland, U.K.
Telephone: +44 141 548 3457
Fax: +44 141 552 2891
e-mail: steve-at-phys.strath.ac.uk *
Go to Steve's personal webpage.

* Please replace -at- with @. This is present for spam prevention.

Research Interests
Quantum Optics
Quantum Information
Foundations of Quantum Theory
Bose Einstein Condensation
Optical Angular Momentum
Quantum Optical Phase
Quantum retrodiction
Career  
2001 Royal Society of Edinburgh and Scottish Executive Education and Lifelong Learning Department Support Research Fellow.
From 1996 Professor of Quantum Optics
1994-1996 Reader
1991 Senior Lecturer
1991-1994 Royal Society of Edinburgh and Scottish Office Education Department Research Fellow
1990-1991 Lecturer in Physics at King's College London
1988-1990 GEC and the Fellowship of Engineering Research Fellow at Oxford University
1987-1988 Harwell - Wolfson Postdoctoral Research Fellow at AEA Harwell and at Wolfson College Oxford
1985-1987 SERC Postdoctoral Research Fellow at Imperial College London
1985 Doctorate in Physics at Imperial College London

Books  

Methods in Theoretical Quantum Optics
Stephen M. Barnett and Paul M. Radmore
(Oxford University Press, Oxford, 1997)

Available in hardback and paperback from OUP (also available from Amazon).

Optical Angular Momentum
L. Allen, Stephen M. Barnett and Miles J. Padgett
(Institute of Physics Publishing, Bristol, 2003).

Available in hardback from IoP (also available from Amazon).

Selected Recent Publications
2004
• Graham Gibson, Johannes Courtial, Miles J. Padgett, Mikhail Vasnetsov, Valeriy Pas’ko, Stephen M. Barnett and Sonja Franke-Arnold
Free-space information transfer using light beams carrying orbital angular momentum
Optics Express 12, 5448 (2004).

• Sonja Franke-Arnold, Stephen M. Barnett, Eric Yao, Jonathan Leach, Johannes Courtial and Miles Padgett
Uncertainty principle for angular position and angular momentum
New Journal of Physics 6, 103 (2004).

• Nicholas K. Whitlock, Stephen M. Barnett and John Jeffers
On the mechanical properties of matter waves
Journal of Physics B: Atomic, Molecular and Optical Physics 37, L293 (2004).

• E.-K. Tan, John Jeffers and Stephen M. Barnett
Field-state measurement in a micromaser using retrodictive quantum theory
Physical Review A 69, 043806 (2004).

• Jonathan Leach, Johannes Courtial, Kenneth Skeldon, Stephen M. Barnett, Sonja Franke-Arnold and Miles J. Padgett
Interferometric Methods to Measure Orbital and Spin, or the Total Angular Momentum of a Single Photon
Physical Review Letters 92, 013601 (2004).

2003
• Yasuyoshimi Mitsumori, John A. Vaccaro, Stephen M. Barnett, Erika Andersson, Atsushi Hasegawa, Masahiro Takeoka and Masahide Sasaki
Experimental Demonstration of Quantum Source Coding
Physical Review Letters 91, 217902 (2003).

• Haiqing Wei, Xin Xue, Jonathan Leach, Miles J. Padgett, Stephen M. Barnett, Sonja Franke-Arnold, Eric Yao, and Johannes Courtial
Simplified measurement of the orbital angular momentum of photons
Optics Communications 223, 117 (2003).

• E.-K. Tan, John Jeffers and Stephen M. Barnett
State vector approximations for the resonant two-photon Jaynes-Cummings model
Journal of Modern Optics 50, 2057 (2003).

• Miles Padgett, Stephen M. Barnett and Rodney Loudon
The angular momentum of light inside a dielectric
Journal of Modern Optics 50, 1555 (2003).

• James D. Cresser and Stephen M. Barnett
The rate of spontaneous decay by a moving atom
Journal of Physics B 36, 1755 (2003).

• Kieran Hunter, Erika Andersson, Claire R. Gilson and Stephen M. Barnett
Maximum fidelity for a mirror symmetric set of qubit states
Journal of Physics A 36, 4159 (2003).

• S. M. Barnett, C. Fabre and A. Maître
Ultimate quantum limits for resolution of beam displacements
European Physical Journal D 22, 513 (2003).

• E.-K. Tan, John Jeffers, Stephen M. Barnett and David T. Pegg
Retrodictive states and two-photon quantum imaging
European Physical Journal D 22, 495 (2003) and 29, 309 (2004).

• R. Zambrini, S. M. Barnett, P. Colet and M. San Miguel
Non-classical behavior in multimode and disordered transverse structures in OPO: Use of the Q-representation
European Physical Journal D 22, 461 (2003).

• S. Franke-Arnold, S. M. Barnett, G. Huyet and C. Sailliot
Coherence properties of two trapped particles
European Physical Journal D 22, 373 (2003).

• Erika Andersson, Igor Jex and Stephen M. Barnett
Comparison of unitary transforms
Journal of Physics A 26, 2325 (2003).

• I. Jex, G. Alber, S. M. Barnett and A. Delgado
Antisymmetric multi-partite quantum states and their applications
Fortschr. Phys. 51, 171 (2003).

• Rodney Loudon, Ottavia Jedrkiewicz, Stephen M. Barnett and John Jeffers
Quantum limits on noise in dual input-output linear optical amplifiers and attenuators
Physical Review A 67, 033803 (2003).

• Nicholas K. Whitlock, Stephen M. Barnett and John Jeffers
Semiclassical theory of matter-wave detection
Journal of Physics B 36, 1273 (2003).

• Stephen M. Barnett, Anthony Chefles and Igor Jex
Comparison of two unknown pure quantum states
Physics Letters A 307, 189 (2003).

2002
• Claire R. Gilson, Xing-Biao Hu and Stephen M. Barnett
On multiple soliton solutions of some simple differential-difference equations
Inverse Problems 18, 1499 (2002).

• J. A. Dunningham, K. Burnett and Stephen M. Barnett
Interferometry below the Standard Quantum Limit with Bose-Einstein Condensates
Physical Review Letters 89, 150401 (2002).

• Masahide Sasaki, Masashi Ban and Stephen M. Barnett
Optimal parameter estimation of a depolarizing channel
Physical Review A 66, 022308 (2002).

• David T. Pegg, Stephen M. Barnett and John Jeffers
Quantum retrodiction in open systems
Physical Review A 66, 022106 (2002).

• John Jeffers, Stephen M. Barnett and David T. Pegg
Retrodiction with two-level atoms: atomic previvals
J. Mod. Opt. 49, 1175 (2002).

• Jonathan Leach, Miles J. Padgett, Stephen M. Barnett, Sonja Franke-Arnold and Johannes Courtial
Measuring the Orbital Angular Momentum of a Single Photon
Physical Review Letters; 88, 257901 (2002).

• Roberta Zambrini and Stephen M. Barnett
Analytic stochastic treatment of nonlinear quantum model with negative diffusion
Physical Review A 65, 053810 (2002).

• Erika Andersson, Stephen M. Barnett, Claire R. Gilson and Kieran Hunter
Minimum-error discrimination between three mirror-symmetric states
Physical Review A 65, 052308 (2002).

• John Jeffers, Stephen M. Barnett and David T. Pegg
Retrodiction as a tool for micromaser field measurements
Journal of Modern Optics; 49, 925 (2002).

• David T. Pegg, Stephen M. Barnett and John Jeffers
Quantum theory of preparation and measurement
Journal of Modern Optics; 49, 913 (2002).

• Miles Padgett, Johannes Courtial, L. Allen, Sonja Franke-Arnold and Stephen M. Barnett
Entanglement of orbital angular momentum for the signal and idler beams in parametric down-conversion
Journal of Modern Optics; 49, 777 (2002).

• Stephen M. Barnett and Erika Andersson
Bound on measurement based on the no-signaling condition
Physical Review A 65, 044307 (2002).

• Sonja Franke-Arnold, Stephen M. Barnett, Miles J. Padgett and L. Allen
Two-photon entanglement of orbital angular momentum states
Physical Review A 65, 033823 (2002).

• Stephen M. Barnett and Tobias Kraemer
CP violation, EPR correlations and quantum state discrimination
Physics Letters A 293, 211 (2002).

• Roberta Zambrini, Stephen M. Barnett, Pere Colet and Maxi San Miguel
Macroscopic quantum fluctuations in noise-sustained optical patterns
Physical Review A 65, 023813 (2002).

• Stephen M. Barnett
Optical angular-momentum flux
Journal of Optics B: Quantum and Semiclassical Optics 4, S7 (2002).

• Jun Mizuno, Mikio Fujiwara, Makoto Akiba, Tetsuya Kawanishi, Stephen M. Barnett and Masahide Sasaki
Optimal detection for extracting maximum information from symmetric qubit sets
Physical Review A, 65, 012315 (2002).

• John Calsamiglia, Stephen M. Barnett and Norbert Lütkenhaus
Conditional beam-splitting attack on quantum key distribution
Physical Review A, 65, 012312 (2002).

2001
• B. J. Dalton, Stephen M. Barnett and B. M. Garraway
Non-Markovian Quantum Optical Processes and Psuedomodes
Fortshritte der Physik 49, 909 (2001).

• Stephen M. Barnett
Quantum Limited State Discrimination
Fortshritte der Physik 49, 909 (2001).

• B. J. Dalton, S. M. Barnett and B. M. Garraway
Theory of pseudomodes in quantum optical processes
Physical Review A 64, 053813 (2001).

• John Calsamiglia, Stephen M. Barnett, Norbert Lütkenhaus and Kalle-Antti Suominen
Removal of a single photon by adaptive absorption
Physical Review A 64, 043814 (2001).

• Stephen M. Barnett and Stig Stenholm
Hazards of reservoir memory
Physical Review A 64, 033808 (2001).

• Stephen M. Barnett, Claire R. Gilson and Masahide Sasaki
Fidelity and the communication of quantum information
J. Phys. A: Math. Gen. 34, 6755 (2001).

• Stephen M. Barnett
Minimum-error discrimination between multiply symmetric states
Physical Review A 64, 030303 (2001).

• Roger B. M. Clarke, Vivien M. Kendon, Anthony Chefles, Stephen M. Barnett, Erling Riis and Masahide Sasaki
Experimental realization of optimal detection strategies for overcomplete states
Physical Review A 64, 012303 (2001).

• Sonja Franke-Arnold, Erika Andersson, Stephen M. Barnett and Stig Stenholm
Generalized measurements of atomic qubits
Physical Review A 63, 052301 (2001).

• Guillaume Huyet, Sonja Franke-Arnold and Stephen M. Barnett
Superposition states at finite temperature
Physical Review A 63, 043812 (2001).

• Roger B. M. Clarke, Anthony Chefles, Stephen M. Barnett and Erling Riis
Experimental demonstration of optimal unambiguous state discrimination
Physical Review A 63, 040305(R) (2001).

• Stephen M. Barnett, David T. Pegg, John Jeffers and Ottavia Jedrkiewicz
Master Equation for Retrodiction of Quantum Communication Signals
Physical Review Letters 86, 2455 (2001).

• Anthony Chefles, Claire R. Gilson and Stephen M. Barnett
Entanglement, information, and multiparticle quantum operations
Physical Review A 63, 032314 (2001).

• Sonja Franke-Arnold, Guillaume Huyet and Stephen M. Barnett
Measures of coherence for trapped matter waves
Journal of Physics B: Atomic, Molecular and Optical Physics 34, 945 (2001).

Major Grants and Research Collaborations
Quantum Structures (QSTRUCT)
Quantum Images (QUANTIM)
Multi-dimensional quantum entanglement and high density information transfer (EPSRC - GR/S03898/01)

Editorial Boards
Journal of Modern Optics
Physical Review A (1998-2004)

Courses
12.229 Quantum Physics
12.129 Skills for Physics
12.594 Advanced Mathematical Methods
PhD Students    
Gordon Yeoman 1991-1994  
Norbert Lütkenhaus 1993-1996  
Anthony (Tony) Chefles 1993-1997  
Lee Phillips 1995-1999  
Kieran Hunter 2000-2004  
Nicholas (Nick) Whitlock 2001-  
Jonathan Leach 2001-  
Eng-Kian (Peter) Tan 2001-  
Jörg Götte 2003-  
Sarah Croke 2004-  
Thomas Brougham 2004-  
Douglas Murray 2004-