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Journal of Experimental and Theoretical Physics Letters

Multiresonator Quantum Memory with Single Atoms

Sergey A. Moiseev, Nikolay Sergeevich Perminov, Aleksei M. Zheltikov

Published Mar 1, 2022• 16 citations
Publisher

Abstract

Quantum memory based on a system of resonators each containing one atom and connected to an external waveguide through a common resonator has been proposed. The parameters of the resonators and atoms interacting with them at which the effective transfer of a single-photon signal wave packet from the external waveguide to atomic states for long-term storage of the quantum state of the photon have been determined using reversible properties of the dynamics of the system under study and optimization methods. The advantages of quantum memory under consideration, as well as experimental possibilities of its implementation, have been discussed.

DOI
10.1134/s0021364022200255

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Quantum memory based on a system of resonators each containing one atom and connected to an external waveguide through a common resonator has been proposed. The parameters of the resonators and atoms interacting with them at which the effective transfer of a single-photon signal wave packet from the external waveguide to atomic states for long-term storage of the quantum state of the photon have been determined using reversible properties of the dynamics of the system under study and optimization methods. The advantages of quantum memory under consideration, as well as experimental possibilities of its implementation, have been discussed.
We propose a composite frequency-scalable quantum memory (QM) scheme based on a system of coupled resonators with single atoms capable of efficient storage of the quantum states of broadband single-photon fields having an arbitrary time form. The analyzed QM consists of 8 high-Q miniresonators coupled to a common resonator that is connected to the external waveguide, where each miniresonator contains a single atom. Based on the methods of optimization of the transfer function, we found the optimal parameters of the QM scheme at which an efficient transfer of a photon wave packet from an external waveguide to the atoms is possible for efficient long-term storage in long-lived atomic states. Various functional modes of using the memory circuit are described and ways to increase efficiency for its use in quantum processing are discussed.
A scheme of multiresonator quantum memory based on a system of four interacting resonators connected through a common resonator to an external carrier by means of switchable coupling has been studied. The parameters of the resonators and the frequency spectrum of the system under study have been optimized using algebraic methods. It has been shown that these parameters allow efficient controlled reversible transfer of information into quantum memory with arbitrarily long storage. Possible applications of the developed scheme for quantum processing have been discussed.
A quantum memory scheme based on an atom in a resonator is proposed. The resonator is coupled to an external waveguide via an additional (buffer) resonator. This setup enables strong interactions between the resonators, expanding the operating spectral range of the quantum memory and improving its dynamic properties. The spectral characteristics of the memory are simulated, depending on tuning parameters near the degeneracy points of the system, and the transfer function of photon loading onto atomic states is optimized. The studied scheme increases the efficiency and quality of loading broadband single-photon states, simplifying control methods compared to the standard single-resonator scheme. Possible implementations of the proposed quantum memory in an integrated circuit are discussed.
We develop an integrated efficient multiresonator quantum memory scheme based on a system of three interacting resonators coupled through a common resonator to an external waveguide via switchable coupler. It is shown that high-precision parameter matching based on step-by-step optimization makes it possible to efficiently store the signal field and enables on-demand retrieval of the signal at specified time moments. Possible experimental implementations and practical applications of the proposed quantum memory scheme are discussed.
In this work, we present an integrated waveguide-resonator scheme of an atomic quantum transistor with a multi-qubit memory. The quantum transistor is realized in an atomic-photon molecule formed of a linear chain of three interconnected resonators, each of which contains one resonant three-level atom. The resonators are connected through the waveguides to the quantum memory containing long-lived multi-atomic ensembles capable of storage of photonic qubits with an arbitrary temporal mode. We consider the protocols for implementation of one- and two-qubit operations in the proposed scheme over a system of qubits stored in quantum memory. The advantages and experimental implementation of the proposed scheme are also discussed.