Joshi, BinodSmith, Thomas A.Shih, Yanhua2025-01-222025-01-222024-12-10Joshi, Binod, Thomas A. Smith, and Yanhua Shih. 揟ime Transfer and Clock Synchronization with Ghost Frequency Comb.� Applied Physics Letters 125, no. 24 (December 10, 2024): 241105. https://doi.org/10.1063/5.0243508.https://doi.org/10.1063/5.0243508http://hdl.handle.net/11603/37379We report an experimental demonstration of a time transfer and distant clock synchronization scheme based on what we have labeled as a ghost frequency comb, observed from the nonlocal correlation measurements of a laser beam. Unlike a conventional frequency comb, the laser beam used in this work does not consist of a pulse train but instead it is in a continuous-wave operation. The laser beam, consisting of half a million longitudinal cavity modes from a fiber ring laser, is split into two beams, each sent to a distant observer. In their local measurements, both observers observe constant intensity with no pulse structure present. Surprisingly, a pulse train of comb-like, ultra-narrow peaks is observed from their nonlocal correlation function measurement. This observation makes an important contribution to the field of precision spectroscopy, as we show in optical correlation-based nonlocal timing and positioning.7 pagesen-USThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.Public Domainhttps://creativecommons.org/publicdomain/mark/1.0/UMBC Quantum Optics LaboratoryText