Remote Entanglement of Superconducting Qubits via Solid-State Spin Quantum Memories

Quantum communication between remote superconducting systems is being studied intensively to increase the number of integrated superconducting qubits and to realize a distributed quantum computer. Since optical photons must be used for communication outside a dilution refrigerator, the direct conver...

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Bibliographic Details
Published in:arXiv.org 2022-03
Main Authors: Kurokawa, Hodaka, Yamamoto, Moyuki, Sekiguchi, Yuhei, Kosaka, Hideo
Format: Article
Language:English
Subjects:
Communication
Dilution
Direct conversion
Heating
Optical memory (data storage)
Optical pumping
Photons
Quantum computers
Quantum computing
Quantum entanglement
Quantum phenomena
Qubits (quantum computing)
Solid state
Superconductivity
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Summary:Quantum communication between remote superconducting systems is being studied intensively to increase the number of integrated superconducting qubits and to realize a distributed quantum computer. Since optical photons must be used for communication outside a dilution refrigerator, the direct conversion of microwave photons to optical photons has been widely investigated. However, the direct conversion approach suffers from added photon noise, heating due to a strong optical pump, and the requirement for large cooperativity. Instead, for quantum communication between superconducting qubits, we propose an entanglement distribution scheme using a solid-state spin quantum memory that works as an interface for both microwave and optical photons. The quantum memory enables quantum communication without significant heating inside the refrigerator, in contrast to schemes using high-power optical pumps. Moreover, introducing the quantum memory naturally makes it possible to herald entanglement and parallelization using multiple memories.
ISSN:2331-8422