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.
Resch
K J
KJ
Department of Physics, University of Queensland, Brisbane QLD 4072, Australia.
Pregnell
K L
KL
Prevedel
R
R
Gilchrist
A
A
Pryde
G J
GJ
O'Brien
J L
JL
White
A G
AG