Entanglement Purification and Protection in a Superconducting Quantum Network

Yan, Haoxiong; Zhong, Youpeng; Chang, Hung-Shen; Bienfait, Audrey; Chou, Ming-Han; Conner, Christopher R.; Dumur, Étienne; Grebel, Joel; Povey, Rhys G.; Cleland, Andrew N.

doi:10.1103/physrevlett.128.080504

Entanglement Purification and Protection in a Superconducting Quantum Network

Journal Article · Tue Feb 22 00:00:00 EST 2022 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.128.080504· OSTI ID:1868971

^[1]; Zhong, Youpeng ^[2]; ^[1]; Bienfait, Audrey ^[3]; ^[1]; ^[1]; Dumur, Étienne ^[4]; Grebel, Joel ^[1]; ^[1]; ^[5]

Univ. of Chicago, IL (United States)
Univ. of Chicago, IL (United States); Southern University of Science and Technology (SUSTech), Shenzhen (China)
Univ. of Chicago, IL (United States); Univ. of Lyon (France)
Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Grenoble Alpes, Grenoble (France)
Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

High-fidelity quantum entanglement is a key resource for quantum communication and distributed quantum computing, enabling quantum state teleportation, dense coding, and quantum encryption. Any sources of decoherence in the communication channel, however, degrade entanglement fidelity, thereby increasing the error rates of entangled state protocols. Entanglement purification provides a method to alleviate these nonidealities by distilling impure states into higher-fidelity entangled states. In this work, we demonstrate the entanglement purification of Bell pairs shared between two remote superconducting quantum nodes connected by a moderately lossy, 1-meter long superconducting communication cable. We use a purification process to correct the dominant amplitude damping errors caused by transmission through the cable, with fractional increases in fidelity as large as 25%, achieved for higher damping errors. The best final fidelity the purification achieves is 94.09 ± 0.98%. In addition, we use both dynamical decoupling and Rabi driving to protect the entangled states from local noise, increasing the effective qubit dephasing time by a factor of 4, from 3 to 12 μs. These methods demonstrate the potential for the generation and preservation of very high-fidelity entanglement in a superconducting quantum communication network.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1868971

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 128; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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