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- D.W. Berry, S. Scheel, P. Knight, B. C. Sanders
- InternationalQuantum Electronics Conference, 2004â€¦
- 2004

Current single photon sources produce single photons with probability p<1. We show how to increase p via postprocessing with linear optics and photodetection, and discuss the limitations to this method

- H.M. Wiseman, D.W. Berry, S.D. Bartlett, B.L. Higgins, G.J. Pryde
- IEEE Journal of Selected Topics in Quantumâ€¦
- 2009

Adaptive techniques make practical many quantum measurements that would otherwise be beyond current laboratory capabilities. For example, they allow discrimination of nonorthogonal states with a probability of error equal to the Helstrom bound, measurement of the phase of a quantum oscillator with accuracy approaching (or in some cases attaining) theâ€¦ (More)

- D.W. Berry, H.M. Wiseman, E. H. Huntington
- 2006 Conference on Lasers and Electro-Optics andâ€¦
- 2006

An experiment is proposed for performing adaptive phase measurements on a continuous squeezed beam such that the variance is below the standard quantum limit. The theory takes into account many issues ignored in previous work.

- B.L. Higgins, H.M. Wiseman, G.J. Pryde, D.W. Berry, S.D. Bartlett
- 2008 Conference on Lasers and Electro-Optics andâ€¦
- 2008

We demonstrate experimental Heisenberg-limited scaling of the variance in optical phase measurements. Our algorithm replaces entangled states - often thought essential for Heisenberg scaling - with single photons, multiple phase shift passes, and adaptive measurement.

- T.A. Wheatley, E. H. Huntington, D.W. Berry, H.M. Wiseman, T. C. Ralph
- 2008 Conference on Lasers and Electro-Optics andâ€¦
- 2008

We present experimental results of the use of continuous adaptive feedback in quantum optical measurement of phase of the sidebands on continuous-wave (cw) coherent light, consistent with theoretical predictions (Berry and Wiseman, 2002).

- D.W. Berry, Hyunseok Jeong, Magdalena Stobinska, T. C. Ralph
- 2008 Conference on Lasers and Electro-Optics andâ€¦
- 2008

We show the necessary and sufficient conditions on loss for valid CHSH-Bell experiments, and propose an experiment with loss which should violate Tsirelsonpsilas bound for entangled states.

- A.C. Funk, M. G. Raymer, D.W. Berry
- InternationalQuantum Electronics Conference, 2004â€¦
- 2004

We present experimental results for a proof-of-principle demonstration of a quantum key-distribution system using macroscopic non-classical optical pulses. The results show a bit error rate of less than the 11% threshold required for absolute security

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