Time-Reversal and Super-Resolving Phase Measurements

Author(s): K. J. Resch, K. L. Pregnell, R. Prevedel, A. Gilchrist, G. J. Pryde, J. L. O’Brien, A. G. White

Journal: Physical Review Letters

Volume: 98

Page(s): 223601

Year: 2007

DOI Number: 10.1103/PhysRevLett.98.223601

Link: Link to publication


We demonstrate phase super-resolution in the absence of entangled states. The key insight is to use the inherent time-reversal symmetry of quantum mechanics: our theory shows that it is possible to measure, as opposed to prepare, entangled states. Our approach is robust, requiring only photons that exhibit classical interference: we experimentally demonstrate high-visibility phase super-resolution with three, four, and six photons using a standard laser and photon counters. Our six-photon experiment demonstrates the best phase super-resolution yet reported with high visibility and resolution.

Note: http://arxiv.org/abs/quant-ph/0511214

File: Link to PDF