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Phys. Rev. Lett. 98, 223601 (2007) [4 pages]

Time-Reversal and Super-Resolving Phase Measurements

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K. J. Resch1,3, K. L. Pregnell1,2,4, R. Prevedel1,5, A. Gilchrist1,2, G. J. Pryde1,2,6, J. L. O’Brien1,2,7, and A. G. White1,2
1Department of Physics, University of Queensland, Brisbane QLD 4072, Australia
2Centre for Quantum Computer Technology, University of Queensland, Brisbane QLD 4072, Australia
3Institute for Quantum Computing and Department of Physics & Astronomy, University of Waterloo, Waterloo, ON N2L 3G1 Canada
4Institute for Mathematical Sciences, Imperial College, London, SW7 2PG Unied Kingdom
5Institute for Experimental Physics, University of Vienna, Vienna, A-1090 Austria
6Centre for Quantum Dynamics & Centre for Quantum Computer Technology, School of Biomolecular and Physical Sciences, Griffith University, Nathan, Brisbane, QLD 4111 Australia
7H. H. Wills Physics Laboratory & Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1UB United Kingdom

See Also: Publisher's Note

Received 7 August 2006; published 31 May 2007; corrected 2 August 2007

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.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.223601
DOI:
10.1103/PhysRevLett.98.223601
PACS:
42.50.Dv, 03.67.−a, 42.50.St

See Also

Publisher's Note: K. J. Resch, K. L. Pregnell, R. Prevedel, A. Gilchrist, G. J. Pryde, J. L. O’Brien, and A. G. White, Publisher’s Note: Time-Reversal and Super-Resolving Phase Measurements [Phys. Rev. Lett. 98, 223601 (2007)], Phys. Rev. Lett. 99, 069902 (2007).

 
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