Time-reversal and super-resolving phase measurements.
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.
Department of Physics, University of Queensland, Brisbane QLD 4072, Australia.
K J
KJ
Resch
K L
KL
Pregnell
R
R
Prevedel
A
A
Gilchrist
G J
GJ
Pryde
J L
JL
O'Brien
A G
AG
White