14.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of GlasgowGB308 papers
- Centre National de la Recherche ScientifiqueFR287 papers
- Massachusetts Institute of TechnologyUS234 papers
- California Institute of TechnologyUS233 papers
- Rutherford Appleton LaboratoryGB231 papers
- Stanford UniversityUS231 papers
- Universitat de les Illes BalearsES230 papers
- Australian National UniversityAU229 papers
- University of SouthamptonGB228 papers
- Leibniz University HannoverDE227 papers
- University of MichiganUS226 papers
- University of BirminghamGB225 papers
15 papers · 1 filter
Non-classical behavior in multimode and disordered transverse structures in OPO. Use of the Q representation
Roberta Zambrini, Stephen M. Barnett, Pere Colet +1
We employ the Q representation to study the non-classical correlations that are present from below to above-threshold in the degenerate optical parametric oscillator. Our study sho…
Measurement does not always aid state discrimination
Kieran Hunter
We have investigated the problem of discriminating between nonorthogonal quantum states with least probability of error. We have determined that the best strategy for some sets of…
Maximum Fidelity Retransmission of Mirror Symmetric Qubit States
Kieran Hunter, Erika Andersson, Claire R. Gilson +1
In this paper we address the problem of optimal reconstruction of a quantum state from the result of a single measurement when the original quantum state is known to be a member of…
Antisymmetric multi-partite quantum states and their applications
I. Jex, G. Alber, S. M. Barnett +1
Entanglement is a powerful resource for processing quantum information. In this context pure, maximally entangled states have received considerable attention. In the case of bipart…
Comparison of unitary transforms
Erika Andersson, Igor Jex, Stephen M. Barnett
We analyze the problem of comparing unitary transformations. The task is to decide, with minimal resources and maximal reliability, whether two given unitary transformations are id…
Comment on "Measuring the Orbital Angular Momentum of a Single Photon"
Haiqing Wei, Xin Xue
Optical modes with different orbital angular momentums (OAMs) per photon may be sorted by Mach-Zehnder interferometers incorporated with beam rotators, without resorting to OAM mod…
Quantum retrodiction in open systems
David T. Pegg, Stephen M. Barnett, John Jeffers
Quantum retrodiction involves finding the probabilities for various preparation events given a measurement event. This theory has been studied for some time but mainly as an intere…
Retrodiction with two-level atoms: atomic previvals
John Jeffers, Stephen M. Barnett, David T. Pegg
In the Jaynes-Cummings model a two-level atom interacts with a single-mode electromagnetic field. Quantum mechanics predicts collapses and revivals in the probability that a measur…
Quantum theory of preparation and measurement
David T. Pegg, Stephen M. Barnett, John Jeffers
The conventional postulate for the probabilistic interpretation of quantum mechanics is asymmetric in preparation and measurement, making retrodiction reliant on inference by use o…
Phase-dependent interaction in a 4-level atomic configuration
Giovanna Morigi, Sonja Franke-Arnold, Gian-Luca Oppo
We study a four-level atomic scheme interacting with four lasers in a closed-loop configuration with a (diamond) geometry. We investigate the influence of the laser…
Retrodiction as a tool for micromaser field measurements
John Jeffers, Stephen M. Barnett, David T. Pegg
We use retrodictive quantum theory to describe cavity field measurements by successive atomic detections in the micromaser. We calculate the state of the micromaser cavity field pr…
Form factor for a family of quantum graphs: An expansion to third order
Gregory Berkolaiko, Holger Schanz, Robert S. Whitney
For certain types of quantum graphs we show that the random-matrix form factor can be recovered to at least third order in the scaled time from periodic-orbit theory. We consid…
Optimal parameter estimation of depolarizing channel
Masahide Sasaki, Masashi Ban, Stephen M. Barnett
We investigate strategies for estimating a depolarizing channel for a finite dimensional system. Our analysis addresses the double optimization problem of selecting the best input…
Comparison of two unknown pure quantum states
Stephen M. Barnett, Anthony Chefles, Igor Jex
We investigate the extent to which we can establish whether or not two quantum systems have been prepared in the same state. We investigate the possibility of universal unambiguous…
Minimum-error discrimination between three mirror-symmetric states
Erika Andersson, Stephen M. Barnett, Claire R. Gilson +1
We present the optimal measurement strategy for distinguishing between three quantum states exhibiting a mirror symmetry. The three states live in a two-dimensional Hilbert space,…