activity
19962026
most citedOptimum Unambiguous Discrimination Between Linearly Independent Symmetric States

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

collaborators

121 papers

physics.optics2026

Measuring Geometric Phase based on Indefinite Causal Order in a Sagnac Interferometer

Lucas Marques Fagundes, Finlay Campbell, Richard Aguiar Maduro +4

Sagnac interferometers are important tools for precision measurements. Cancellation of common-path noise ensures a high degree of stability against external perturbations, while th…

quant-ph2023

Revisiting the damped quantum harmonic oscillator

Stephen M. Barnett, James D. Cresser, Sarah Croke

We reanalyse the quantum damped harmonic oscillator, introducing three less than common features. These are (i) the use of a continuum model of the reservoir rather than an ensembl…

physics.optics2023★ 9 cited

On lines of constant polarisation in structured light beams

Stephen M. Barnett, Fiona C. Speirits, Joerg B. Goette

We show that Skyrmion field lines, constructed from the local Stokes parameters, trace out lines of constant optical polarisation.

quant-ph2022

Glauber-Sudarshan P-representations for fermions

Stephen M. Barnett, Bryan J. Dalton

The Glauber-Sudarshan P-representation is well-known within quantum optics, and is widely applied to problems involving photon statistics. Less familiar, perhaps, is its fermionic…

physics.optics2022★ 2 cited

Topological approach of characterizing optical Skyrmions and Skyrmion lattices

A. McWilliam, C. M. Cisowski, Z. Ye +4

The Skyrmion number of paraxial optical Skyrmions can be defined solely via their polarization singularities and associated winding numbers, using a mathematical derivation that ex…

quant-ph2022★ 17 cited

On single-photon and classical interference

Stephen M. Barnett

It has often been remarked that single-photon interference experiments, however complicated, seem to behave very much in the same way as those performed in the classical regime, us…