Lifting the bandwidth limit of optical homodyne measurement with broadband parametric amplification

Yaakov Shaked, Yoad Michael, Rafi Z. Vered, Leon Bello, Michael Rosenbluh and Avi Pe’er ()
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Yaakov Shaked: Bar-Ilan University
Yoad Michael: Bar-Ilan University
Rafi Z. Vered: Bar-Ilan University
Leon Bello: Bar-Ilan University
Michael Rosenbluh: Bar-Ilan University
Avi Pe’er: Bar-Ilan University

Nature Communications, 2018, vol. 9, issue 1, 1-12

Abstract: Abstract Homodyne measurement is a corner-stone method of quantum optics that measures the quadratures of light—the quantum optical analog of the canonical position and momentum. Standard homodyne, however, suffers from a severe bandwidth limitation: while the bandwidth of optical states can span many THz, standard homodyne is inherently limited to the electronically accessible MHz-to-GHz range, leaving a dramatic gap between relevant optical phenomena and the measurement capability. We demonstrate a fully parallel optical homodyne measurement across an arbitrary optical bandwidth, effectively lifting this bandwidth limitation completely. Using optical parametric amplification, which amplifies one quadrature while attenuating the other, we measure quadrature squeezing of 1.7 dB simultaneously across 55 THz, using the pump as the only local oscillator. As opposed to standard homodyne, our measurement is robust to detection inefficiency, and was obtained with >50% detection loss. Broadband parametric homodyne opens a wide window for parallel processing of quantum information.

Date: 2018
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DOI: 10.1038/s41467-018-03083-5

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