Sub-shot-noise-limited phase estimation via SU(1,1) interferometer with thermal states

Abstract

We theoretically study the phase sensitivity of an SU(1,1) interferometer with a thermal state and squeezed vacuum state as inputs and parity detection as measurement. We find that phase sensitivity can beat the shot-noise limit and approaches the Heisenberg limit with increasing input photon number.

7 pages, 6 figures

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• SU(1,1) interferometry with parity measurement
• Versatile Super-Sensitive Metrology Using Induced Coherence
• Generation of nonclassical states of light via truncation of mixed states
• Enhanced phase sensitivity in a Mach-Zehnder interferometer via photon recycling