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- W4226281857 abstract "Timing and positioning measurements are key requisites for essential quantum network operations such as Bell state measurement. Conventional time-of-flight measurements using single-photon detectors are often limited by detection timing jitter. In this work, we demonstrate a nonlocal scheme to measure changes in relative link latencies with subpicosecond resolution by using tight timing correlation of broadband time-energy entangled photons. Our sensing scheme relies on spectral interference achieved via phase modulation, followed by filtering and biphoton coincidence measurements, and is resilient to microsecond-scale mismatch between the optical link traversed by the biphotons. Our experiments demonstrate a precision of +/-0.04 ps in measurements of nonlocal delay changes and +/-0.7{deg} in measurements of radio-frequency phase changes. Furthermore, we complement our technique with time-tag information from single-photon detectors in the same setup to present unambiguous sensing of delay changes. The proposed technique can be implemented using off-the-shelf telecom equipment thus rendering it adaptable to practical quantum network infrastructure." @default.
- W4226281857 created "2022-05-05" @default.
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- W4226281857 date "2022-02-23" @default.
- W4226281857 modified "2023-09-23" @default.
- W4226281857 title "Nonlocal subpicosecond delay metrology using spectral quantum interference" @default.
- W4226281857 doi "https://doi.org/10.48550/arxiv.2202.11816" @default.
- W4226281857 hasPublicationYear "2022" @default.
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