Remote entanglement via adiabatic passage using a tunably-dissipative quantum communication system
| Autor: | Joel Grebel, Ming-Han Chou, Youpeng Zhong, Andrew Cleland, Audrey Bienfait, Rhys Povey, Hung-Shen Chang, G. A. Peairs, Etienne Dumur, Christopher Conner, Kevin J. Satzinger |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Quantum Physics Bell state Photon General Physics and Astronomy FOS: Physical sciences Quantum entanglement Data_CODINGANDINFORMATIONTHEORY 01 natural sciences Quantum state Quantum mechanics Qubit 0103 physical sciences 010306 general physics Adiabatic process Quantum information science Quantum Physics (quant-ph) Quantum Computer Science::Information Theory |
| DOI: | 10.48550/arxiv.2005.12334 |
| Popis: | Effective quantum communication between remote quantum nodes requires high fidelity quantum state transfer and remote entanglement generation. Recent experiments have demonstrated that microwave photons, as well as phonons, can be used to couple superconducting qubits, with a fidelity limited primarily by loss in the communication channel. Adiabatic protocols can overcome channel loss by transferring quantum states without populating the lossy communication channel. Here we present a unique superconducting quantum communication system, comprising two superconducting qubits connected by a 0.73 m-long communication channel. Significantly, we can introduce large tunable loss to the channel, allowing exploration of different entanglement protocols in the presence of dissipation. When set for minimum loss in the channel, we demonstrate an adiabatic quantum state transfer protocol that achieves 99% transfer efficiency as well as the deterministic generation of entangled Bell states with a fidelity of 96%, all without populating the intervening communication channel, and competitive with a qubit-resonant mode-qubit relay method. We also explore the performance of the adiabatic protocol in the presence of significant channel loss, and show that the adiabatic protocol protects against loss in the channel, achieving higher state transfer and entanglement fidelities than the relay method. Comment: 27 pages, 14 figures |
| Databáze: | OpenAIRE |
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