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

Electro-Optical Sampling of Single-Cycle THz Fields with Single-Photon Detectors.
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DOI:
10.3390/s22239432
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发表时间:
2022-12-02
期刊:
Sensors (Basel, Switzerland)
影响因子:
--
通讯作者:
Clerici M
Clerici M
中科院分区:
其他
文献类型:
--
作者:
Shields T;Dada AC;Hirsch L;Yoon S;Weaver JMR;Faccio D;Caspani L;Peccianti M;Clerici M

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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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