Optical Lattice Clocks for Precision Time and Frequency Metrology

Takamoto, Masao; Katori, Hidetoshi

doi:10.1007/978-4-431-55756-2_5

Cited by 3 publications

(2 citation statements)

References 59 publications

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“…In the era of 6G and beyond networks, understanding quantum synchronization within an optical lattice clock becomes critical for providing ultra-precise and dependable network synchronization, which is required for low-latency communications and Tactile Internet 11 . Quantum synchronization with optical lattice clocks offers a paradigm shift in the synchronization of time-keeping devices, which is critical for sophisticated telecommunications infrastructure 2,12,13 . Synchronization in classical systems includes the adjustment of oscillator rhythmic oscillations to external perturbations such as electromagnetic radiation.…”

Section: Quantum Synchronization In the Optical Latticementioning

confidence: 99%

Integrating Quantum Synchronization in Future Generation Networks

Nande,

Habibie,

Ghadimi

et al. 2024

Preprint

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5G and beyond networks are expected to host several heterogeneous verticals with very different requirements in terms of latency, data rate, etc. In the case of human-machine collaboration and cohabitation, very low latency is necessary to permit the seamless remote control of robots and the transmission of sensory experience involving not only audiovisual but also tactile information. In this context, ultra-precise and reliable time synchronization is pivotal. However, existing standards like the Precision Time Protocol (PTP) are proven to be unreliable because of jitters, datagram losses, and complexity. This notifies that the increase of synchronization error from the ideal tens of nanoseconds to hundreds of microseconds is unacceptable in future generation networks. This study provides a novel way for establishing ultra-precise synchronization, which is critical for the growth of converged optical communication networks and the 6G era. We present a unique synchronization mechanism that takes advantage of the unprecedented accuracy of optical lattice clocks and frequency combs in conjunction with electronic components such as Analog-to-Digital Converters (ADCs) and Field-Programmable Gate Arrays (FPGAs). Our method transforms optical pulses into precisely timed electrical signals that may be analyzed and used in sophisticated network systems. This technology assures that data transfer across networks is precisely synchronised and crucial for developing future networks where data must be synchronized over immense distances with minimal latency. Our work demonstrates feasibility and practical applicability using thorough simulations (MATLAB), moving beyond theoretical principles to implementable solutions using existing technical capabilities. The purpose of this paper is to bring femtosecond signal synchronization to nanosecond-level devices. In the simulation, we use an optical signal with a frequency of 1000 THz and downconverted to a lower microwave frequency (100 GHz) — to achieve picosecond-level synchronised signals. The downconverted signal is exposed to white noise and then digitalised. This digital signal is then simulated by reducing the sampling rate to fs = 10 THz and limiting the resolution to b = 8 bits. Finally, high-frequency noises are removed by implementing low-pass filtration using FPGAs.

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Section: Quantum Synchronization In the Optical Latticementioning

confidence: 99%

Integrating Quantum Synchronization in Future Generation Networks

Nande,

Habibie,

Ghadimi

et al. 2024

Preprint

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“…Optical lattice traps find applications within quantum simulation [1,2], tests of fundamental physics [3,4], and are an essential element of optical lattice clocks (OLCs) [5][6][7][8]. Since their inception [9], OLCs have undergone rapid development leading to a new era of relativistic geodesy [10,11], and have been used to perform one of the most stringent tests of general relativity through measurement of the gravitational redshift [12].…”

Section: Introductionmentioning

confidence: 99%

Simulation of optical lattice trap loading from a cold atomic ensemble

Watson,

McFerran

2020

Preprint

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We model the efficiency of loading atoms of various species into a one dimensional optical lattice from a cold ensemble taking into account the initial cloud temperature and size, the lattice laser properties affecting the trapping potential, and atomic parameters. Stochastic sampling and dynamical evolution are used to simulate the transfer, leading to estimates of transfer efficiency for varying trap depth and profile. Tracing the motion of the atoms also enables the evaluation of the equilibrium temperature and site occupancy in the lattice. The simulation compares favourably against a number of experimental results, and is used to compute an optimum lattice-waist to cloud-radius ratio for a given optical power.

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Simulation of optical lattice trap loading from a cold atomic ensemble

Watson

2020

J. Opt. Soc. Am. B

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We model the efficiency of loading atoms of various species into a one-dimensional optical lattice from a cold ensemble, taking into account the initial cloud temperature and size, the lattice laser properties affecting the trapping potential, and the atomic parameters. Stochastic sampling and dynamical evolution are used to simulate the transfer, leading to estimates of transfer efficiency for varying trap depth and profile. Tracing the motion of the atoms also enables the evaluation of the equilibrium temperature and site occupancy in the lattice. The simulation compares favorably against a number of experimental results and is used to compute an optimum lattice-waist-to-cloud-radius ratio for a given optical power.

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Optical Lattice Clocks for Precision Time and Frequency Metrology

Cited by 3 publications

References 59 publications

Integrating Quantum Synchronization in Future Generation Networks

Integrating Quantum Synchronization in Future Generation Networks

Simulation of optical lattice trap loading from a cold atomic ensemble

Simulation of optical lattice trap loading from a cold atomic ensemble

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