Electro-Optical Sampling of Single-Cycle THz Fields with Single-Photon Detectors

• URL: http://arxiv.org/abs/2208.02103v2
• Date: Mon, 12 Dec 2022 11:35:04 GMT
• Title: Electro-Optical Sampling of Single-Cycle THz Fields with Single-Photon Detectors
• Authors: Taylor Shields, Adetunmise C. Dada, Lennart Hirsch, Seungjin Yoon, Jonathan M. R. Weaver, Daniele Faccio, Lucia Caspani, Marco Peccianti, Matteo Clerici
• Abstract summary: We report on experiments on THz electro-optical sampling using single-photon detectors and a weak squeezed vacuum field as the optical probe. Our approach achieves field sensitivity limited by the probe state statistical properties using phase-locked single-photon detectors.
• Score: 0.8937790536664089
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Electro-optical sampling of Terahertz fields with ultrashort pulsed probes is a well-established approach for directly measuring the electric field of THz radiation. This technique usually relies on balanced detection to record the optical phase shift brought by THz-induced birefringence. The sensitivity of electro-optical sampling is, therefore, limited by the shot noise of the probe pulse, and improvements could be achieved using quantum metrology approaches using, e.g., NOON states for Heisenberg-limited phase estimation. We report on our experiments on THz electro-optical sampling using single-photon detectors and a weak squeezed vacuum field as the optical probe. Our approach achieves field sensitivity limited by the probe state statistical properties using phase-locked single-photon detectors and paves the way for further studies targeting quantum-enhanced THz sensing.

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