Heisenberg-limited interferometry with pair coherent states and parity measurements

Abstract

After reviewing parity measurement based interferometry with twin-Fock states, which allows for super-sensitivity (Heisenberg-limited) and super-resolution, we consider interferometry with two different superpositions of twin-Fock states, namely two-mode squeezed vacuum states and pair coherent states. This study is motivated by the experimental challenge of producing twin-Fock states on opposite sides of a beam splitter. We find that input two-mode squeezed states, while allowing for Heisenberg-limited sensitivity, do not yield super-resolutions, whereas we that find both are possible with input pair coherent states.

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• LIGO: The Laser Interferometer Gravitational-Wave Observatory
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• Quantum teleportation with pair-coherent states
• Robustness of Heisenberg-limited interferometry with balanced Fock states
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