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Radiophysics and Quantum Electronics

A theoretical analysis of the discrimination characteristics of a two-circuit AFC system in a quantum frequency standard

S. A. Kozlov, V. A. Logachev

Published Aug 1, 1984• 0 citations
Publisher
DOI
10.1007/bf01040472

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We propose an improvement for increasing the performance of locked periodic atomic frequency standards(AFS), based on correcting the noise of the asynchronism of phase-detecting and feedback process. Theoretical analysis and numerical simulation show that the method can optimize the stability AFS which is related with d. And is the duty of phase-discriminating of AFS. If in-loop noise possesses white frequency noise characteristics, the stability will decrease following the coefficient of √(1 − d). Specially, when d approaches to 1, the stability will reach the limit of quantum project noise. Here we demonstrate three schemes to realize the idea in experiments and overlap-feedback is the most easily implemented one. Considering Dick effect in our method, the stability of our atomic fountain will be better than 1 × 10−14τ−1/2at d>0.93.
Photonic quantum memory, such as an atomic frequency comb (AFC), is essential to make photonic quantum computation and long distance quantum communication scalable and feasible. In standard AFC the frequency of different atoms must be stable relative to each other which presents difficulties in realizing the quantum memory. Here we propose a quantum memory using an intra-atomic frequency comb which does not require frequency stabilization. We show that the transitions between two degenerate energy levels of a single atom can be used to construct the frequency comb. The spacing between the teeth of the comb is controlled by applying an external magnetic field. Since the frequency comb is constructed from individual atoms, these atoms can be used alone or in ensembles to realize the quantum memory. Furthermore, the ensemble based quantum memory with intra-AFC is robust against Doppler broadening which makes it useful for high-temperature quantum memory. As an example, we numerically show the intra-AFC in cesium atoms and demonstrate a photon echo which is essential for quantum memory.
Scalable photonic circuits are essential for realizing practical quantum networks beyond proof-of-principle demonstrations. Although diamond-based integrated photonics has been extensively investigated over the past two decades for quantum networking applications, its integration into scalable photonic platforms remains challenging. Quantum memories based on rare-earth-ion atomic frequency combs (AFCs) offer an attractive alternative; however, most demonstrations to date have relied on bulk free-space crystals, limiting their scalability for practical implementations. In this work, we systematically investigate the potential for hybrid integration of AFC-based quantum memories with a scalable integrated photonic platform. We propose a device architecture combining thin-film lithium tantalate (TFLT) nanophotonic circuits with ytterbium-doped yttrium orthosilicate (Yb:YSO) crystals for long-distance quantum communication. Our analysis shows that the hybrid TFLT-YSO platform offers a promising and scalable pathway toward integrated quantum memories and, ultimately, large-scale quantum networks.