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Conference on Lasers and Electro-Optics

Polarization Quantum State Tomography With a Single Liquid Crystal Variable Retarder

Spencer J. Johnson, John Floyd, Kelsey Ortiz, Paul G. Kwiat

Published Jan 1, 2022• 1 citation
Publisher

Abstract

We present a method of performing polarization-based quantum state tomography with a single liquid crystal variable retarder per photon, allowing for full state characterization to be performed in applications where space and power are limited.
DOI
10.1364/cleo_at.2022.jtu3a.27

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A scheme for quantum-state tomography is presented that can be performed for polarized light with an arbitrary photon-number distribution. The proposed method fills the gap between existing polarization-tomography schemes for single-photon states and for optical fields with very large photon numbers. It consists of an optical homodyne setup triggered by the outcome of a single-photon counting module. The configuration space of polarization is parametrized by Euler angles and by an additional interference parameter, whose assessment requires conditional homodyne measurements.