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Microwave quantum memcapacitor effect
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DOI：10.1038/s43246-024-00505-4.png)
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Developing the field of neuromorphic quantum computing necessitates designing scalable quantum memory devices. Here, we propose a superconducting quantum memory device in the microwave regime, termed a microwave quantum memcapacitor. It comprises two linked resonators, the primary one is coupled to a Superconducting Quantum Interference Device, which allows for the modulation of the resonator properties through external magnetic flux. The auxiliary resonator, operated through weak measurements, provides feedback to the primary resonator, ensuring stable memory behavior. This device operates with a classical input in one cavity while reading the response in the other, serving as a fundamental building block toward arrays of microwave quantum memcapacitors. We observe that a bipartite setup can retain its memory behavior and gains entanglement and quantum correlations. Our findings pave the way for the experimental implementation of memcapacitive superconducting quantum devices and memory device arrays for neuromorphic quantum computing. Nonlinear memory devices such as memristors, memcapacitors, and meminductors, are the building blocks of energy-efficient neuromorphic computing. Here, the authors propose a superconducting circuit design acting as a microwave quantum memcapacitor, which could be implemented in neuromorphic quantum computing architectures.
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