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.
Original language | English |
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Article number | 9432 |
Number of pages | 9 |
Journal | Sensors (Basel, Switzerland) |
Volume | 22 |
Issue number | 23 |
DOIs | |
Publication status | Published - 2 Dec 2022 |
Keywords
- terahertz radiation
- equipment design
- terahertz wave photonics
- terahertz spectroscopy
- single-photon detection
- electricity
- photons