265 citations · 4.2k across the 119 of their papers we have counts for
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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…
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…
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…
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…