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.
In this paper, we propose a scheme of a long-lived broadband superefficient multiresonator quantum memory in which a common resonator is connected with an external waveguide and with a system of high-quality miniresonators containing long-lived resonant electron spin ensembles. The scheme with 4 miniresonators has been analyzed in details and it was shown that it is possible to store an input broadband signal field to the electron spin ensembles with quantum efficiency 99.99%. The considered multiresonator system opens the way to elaboration of efficient multiqubit quantum memory devices for superconducting quantum computer.
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