期刊
FRONTIERS OF PHYSICS
卷 17, 期 6, 页码 -出版社
HIGHER EDUCATION PRESS
DOI: 10.1007/s11467-022-1166-1
关键词
tranferring entangled states; superconducting qubits; microwave field qubits; coherent states; circuit QED
资金
- Key-Area Research and Development Program of Guang Dong Province [2018B030326001]
- National Natural Science Foundation of China (NSFC) [12004253, 11074062, 11374083, 11774076, 11804228, 11965017, U21A20436]
- Jiangxi Natural Science Foundation [20192ACBL20051, 20212BAB211019, 20212BAB201025]
This article proposes a method for transferring entangled states between superconducting qubits and microwave-field qubits, using multiple superconducting qutrits and microwave cavities. The method allows for deterministic transfer and reduces decoherence effects.
Transferring entangled states between matter qubits and microwave-field (or optical-field) qubits is of fundamental interest in quantum mechanics and necessary in hybrid quantum information processing and quantum communication. We here propose a way for transferring entangled states between superconducting qubits (matter qubits) and microwave-field qubits. This proposal is realized by a system consisting of multiple superconducting qutrits and microwave cavities. Here, qutrit refers to a three-level quantum system with the two lowest levels encoding a qubit while the third level acting as an auxiliary state. In contrast, the microwave-field qubits are encoded with coherent states of microwave cavities. Because the third energy level of each qutrit is not populated during the operation, decoherence from the higher energy levels is greatly suppressed. The entangled states can be deterministically transferred because measurement on the states is not needed. The operation time is independent of the number of superconducting qubits or microwave-field qubits. In addition, the architecture of the circuit system is quite simple because only a coupler qutrit and an auxiliary cavity are required. As an example, our numerical simulations show that high-fidelity transfer of entangled states from two superconducting qubits to two microwave-field qubits is feasible with present circuit QED technology. This proposal is quite general and can be extended to transfer entangled states between other matter qubits (e.g., atoms, quantum dots, and NV centers) and microwave- or optical-field qubits encoded with coherent states.
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