Optimal non-local Franson bi-photon quantum interferometry via high-finesse cavities in quantum communications

ORAL

Abstract

The Franson interferometer has been a crucial tool for assessing a range of quantum applications, such as time-energy entanglement distribution, quantum key distribution, and quantum networks. Specifically, mode-locked biphoton frequency combs (BFCs) with discrete comb-like temporal correlations have significantly contributed to enhancing time-energy entanglement in these quantum applications. Nevertheless, we've noted that the visibility of Franson interference recurrence in BFCs tends to decrease as the cavity round trips are extended, resulting in a weakening of time-energy entanglement. In our research, we have identified the cavity finesse F as a pivotal parameter for optimizing non-local Franson biphoton interferometry and BFC time correlations. In our initial observations, BFCs with free-spectral ranges of 5.03 GHz and 15.15 GHz, each filtered with a cavity finesse F of 11.14, displayed a decay pattern of Franson interference recurrence and reduced time-energy entanglement. However, when we utilized a higher cavity finesse of 45.92 and filtered a 15.11 GHz BFC, we achieved an approximately 3.13-fold improvement in Franson interference visibility compared to the Franson visibility associated with a cavity finesse of 11.14, specifically at the sixth time bin. With a finesse of F = 200, we anticipate achieving near-optimal Franson interference recurrence and a time-bin Schmidt number of around 16 effective modes in a similar free-spectral range. Our experimental setup provides flexibility in adjusting cavity parameters, making it suitable for various quantum applications, including high-dimensional quantum information processing and robust quantum communications.

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Presenters

  • Sophi C Song

    University of California, Los Angeles

Authors

  • Sophi C Song

    University of California, Los Angeles

  • Kai-Chi Chang

    University of California, Los Angeles

  • Xiang Cheng

    University of California Los Angeles, University of California, Los Angeles

  • Murat Can Sarihan

    University of California, Los Angeles

  • Chee Wei Wong

    University of California, Los Angeles