Nonlocal subpicosecond delay metrology using spectral quantum interference

• URL: http://arxiv.org/abs/2202.11816v1
• Date: Wed, 23 Feb 2022 22:36:57 GMT
• Title: Nonlocal subpicosecond delay metrology using spectral quantum interference
• Authors: Suparna Seshadri, Navin Lingaraju, Hsuan-Hao Lu, Poolad Imany, Daniel E. Leaird, and Andrew M. Weiner
• Abstract summary: We demonstrate a nonlocal scheme to measure changes in relative link latencies with subpicosecond resolution. Our sensing scheme relies on spectral interference achieved via phase modulation, followed by filtering and biphoton coincidence measurements. Our experiments demonstrate a precision of +/-0.04 ps in measurements of nonlocal delay changes and +/-0.7deg in measurements of radio-frequency phase changes.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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