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Journal of Lightwave Technology

Remote Preparation of Bright Squeezed Light via Field-Deployed Multi-Core Fibers

Jintao Wang, Jinpeng Liao, Zhirong Chen, Xiaojie Guo, Zhaohui Li, Dawei Wang

Published Oct 8, 2024• 1 citation
Publisher

Abstract

We developed a novel scheme for remote preparation of bright squeezed light using standard fiber-based components over field-deployed multi-core fibers. By implementing two phase-locked loops, we successfully generated bright amplitude-squeezed light over a 6 km laboratory single-mode fiber and a 17 km field-deployed multi-core fiber with measured squeezing levels of −2.52 dB and −1.80 dB, respectively. We also observed bright phase-squeezed light in the two scenarios with squeezing levels of −2.01 dB and −0.91 dB. We also measured results similar to those of the deployed fiber by using a 30 km laboratory single-mode fiber with comparable optical loss. The squeezed properties were confirmed with reconstructed Wigner functions using quantum state tomography. Our approach enabled remote users to access user-defined squeezed light based on a single seed laser, thereby maintaining coherence between their squeezed states, which could find applications in fiber-based quantum information processing and quantum metrology.

DOI
10.1109/jlt.2024.3476419

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Squeezed light plays a vital role in quantum information processing. However, its highly sensitive nature presents significant practical challenges, particularly in remote detection, which traditionally requires complex systems such as active phase locking, clock synchronization, and polarization control. Here, we propose and demonstrate an asynchronous detection method for squeezed light eliminating the need for these complex systems. By employing radio-frequency heterodyne detection with a locally generated local oscillator and applying a series of digital unitary transformations, we successfully reconstruct squeezed states of light. We validate our approach in two key applications: the distribution of squeezed light over a 10 km fiber channel, and passive continuous-variables quantum key distribution based on squeezed vacuum states between two labs connected via deployed fiber. This demonstrates a practical digital reconstruction method for squeezed light, opening new avenues for practical distributed quantum sensing networks and high-performance, long-distance quantum communication using squeezed states.