Quantum states for Heisenberg-limited interferometry

Details Quantum states for Heisenberg-limited interferometry Quantum states for Heisenberg-limited interferometry

2007-02-16

arxiv.org/abs/quant-ph/0702170v3

Physical Review A 76, 013804, (2007)

Physics

Quantum Physics

Published version, Updated discussion on N00N states, 11 pages, 6 figures

Scientific paper

10.1103/PhysRevA.76.013804

The phase resolution of interferometers is limited by the so-called Heisenberg limit, which states that the optimum phase sensitivity is inversely proportional to the number of interfering particles N, a 1/sqrt{N} improvement over the standard quantum limit. We have used simulated annealing, a global optimization strategy, to systematically search for quantum interferometer input states that approach the Heisenberg limited uncertainty in estimates of the interferometer phase shift. We compare the performance of these states to that of other non-classical states already known to yield Heisenberg limited uncertainty.

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