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Direct comparison of two spin-squeezed optical clock ensembles at the 10−17 level

John Martin Robinson, Maya Miklos, Yee Ming Tso +5 more

Nature PhysicsJan 11, 2024101 citations

Optimization of Feedback-Loop Parameters in Thulium Optical Clocks at Synchronous Comparison

Dmitry O. Tregubov, Daniil I. Provorchenko, D. Mishin +2 more

Synchronous comparison of optical clocks using phase-coherent clock lasers makes it possible to determine the difference (ratio) of clock transition frequencies, which is not limited by the total noise of lasers in use. A detailed simulation of the comparison of two thulium optical clocks is performed using synchronous interrogation of atoms by the radiation of a common clock laser. Some critical parameters have been determined, specifically: the residual noncorrelated frequency and amplitude noises of test pulses and reading noises, which may deteriorate the comparison stability. At the same time, it is demonstrated that this way is insensitive to fluctuations in the number of atoms, calibration of feedback-loop parameters, individual ejections in measurement cycles, and fluctuations of laboratory magnetic field.Synchronous comparison of optical clocks using phase-coherent clock lasers makes it possible to determine the difference (ratio) of clock transition frequencies, which is not limited by the total noise of lasers in use. A detailed simulation of the comparison of two thulium optical clocks is performed using synchronous interrogation of atoms by the radiation of a common clock laser. Some critical parameters have been determined, specifically: the residual noncorrelated frequency and amplitude noises of test pulses and reading noises, which may deteriorate the comparison stability. At the same time, it is demonstrated that this way is insensitive to fluctuations in the number of atoms, calibration of feedback-loop parameters, individual ejections in measurement cycles, and fluctuations of laboratory magnetic field.

Журнал Экспериментальной и Теоретической ФизикиDec 15, 20230 citations

Optimization of Feedback-Loop Parameters in Thulium Optical Clocks at Synchronous Comparison

Dmitry O. Tregubov, Daniil I. Provorchenko, D. Mishin +2 more

Abstract Synchronous comparison of optical clocks using phase-coherent clock lasers makes it possible to determine the difference (ratio) of clock transition frequencies, which is not limited by the total noise of lasers in use. A detailed simulation of the comparison of two thulium optical clocks is performed using synchronous interrogation of atoms by the radiation of a common clock laser. Some critical parameters have been determined, specifically: the residual noncorrelated frequency and amplitude noises of test pulses and reading noises, which may deteriorate the comparison stability. At the same time, it is demonstrated that this way is insensitive to fluctuations in the number of atoms, calibration of feedback-loop parameters, individual ejections in measurement cycles, and fluctuations of laboratory magnetic field.Abstract Synchronous comparison of optical clocks using phase-coherent clock lasers makes it possible to determine the difference (ratio) of clock transition frequencies, which is not limited by the total noise of lasers in use. A detailed simulation of the comparison of two thulium optical clocks is performed using synchronous interrogation of atoms by the radiation of a common clock laser. Some critical parameters have been determined, specifically: the residual noncorrelated frequency and amplitude noises of test pulses and reading noises, which may deteriorate the comparison stability. At the same time, it is demonstrated that this way is insensitive to fluctuations in the number of atoms, calibration of feedback-loop parameters, individual ejections in measurement cycles, and fluctuations of laboratory magnetic field.

Journal of Experimental and Theoretical PhysicsAug 1, 20232 citations

Progress toward a spin squeezed optical atomic clock beyond the standard quantum limit

Boris Braverman, Akio Kawasaki, Vladan Vuletić

Bulletin of the American Physical SocietyJun 11, 20150 citations

Squeezing and Quantum Noise Quenching in Optically Pumped Atomic Clocks

G. M. Saxena, B.S. Mathur

Springer eBooksJan 1, 19930 citations

Spin Squeezing-Enhanced Stability in an Optical Lattice Clock Comparison

Maya Miklos, Yee Ming Tso, John Martin Robinson +3 more

We perform a self-synchronous clock comparison between two spin-squeezed ensembles in a strontium optical lattice clock to directly measure 2.0(3) dB of metrological gain beyond quantum projection noise-limited operation, averaging down to the 10 − 17 level.

Quantum 2.0 Conference and ExhibitionJan 1, 20230 citations

Clock laser noise constraining synchronous comparison of spin-squeezed optical clocks

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