Coherent mixed with squeezed vacuum light interferometry: parity detection hits the Heisenberg limit

Kaushik Seshadreesan; Petr Anisimov; Hwang Lee; Jonathan Dowling

doi:10.1117/12.910803

23 February 2012 Coherent mixed with squeezed vacuum light interferometry: parity detection hits the Heisenberg limit

Kaushik Seshadreesan, Petr Anisimov, Hwang Lee, Jonathan Dowling

Proceedings Volume 8272, Advances in Photonics of Quantum Computing, Memory, and Communication V; 82720N (2012) https://doi.org/10.1117/12.910803
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

Mach-Zehnder interferometry based on mixing the coherent and the squeezed vacuum states of light has Heisenberg limited capabilities for phase estimation. This is also, because the quantum Cramer-Rao bound on sensitivity of phase estimation with the above interferometric scheme reaches the Heisenberg limit when the inputs are mixed in hear equal proportions. We show that a detection strategy based on the measurement of parity of photon number in one of the output modes of the interferometer saturates the quantum Cramer-Rao bound of the interferometric scheme, and therefore- as a consequence- hits the Heisenberg limit when the inputs are mixed in equal intensities.

Citation Download Citation

Kaushik Seshadreesan, Petr Anisimov, Hwang Lee, and Jonathan Dowling "Coherent mixed with squeezed vacuum light interferometry: parity detection hits the Heisenberg limit", Proc. SPIE 8272, Advances in Photonics of Quantum Computing, Memory, and Communication V, 82720N (23 February 2012); https://doi.org/10.1117/12.910803

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