Related papers: Error-detected state transfer and entanglement in a superconducting quantum network

Error-detected state transfer and entanglement in a superconducting quantum network

URL: http://arxiv.org/abs/2004.06168v1
Date: Mon, 13 Apr 2020 19:34:37 GMT
Title: Error-detected state transfer and entanglement in a superconducting quantum network
Authors: Luke D. Burkhart, James Teoh, Yaxing Zhang, Christopher J. Axline, Luigi Frunzio, M.H. Devoret, Liang Jiang, S.M. Girvin, and R.J. Schoelkopf
Abstract summary: Modular networks are a promising paradigm for increasingly complex quantum devices based on the ability to transfer qubits and generate entanglement between modules. We demonstrate communication and entanglement in a superconducting network with a microwave-actuated beamsplitter transformation between two bosonic qubits. We show several promising methods for faithful operations between modules, including novel possibilities for resource-efficient direct gates.
Score: 1.8063563681614785
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Modular networks are a promising paradigm for increasingly complex quantum devices based on the ability to transfer qubits and generate entanglement between modules. These tasks require a low-loss, high-speed intermodule link that enables extensible network connectivity. Satisfying these demands simultaneously remains an outstanding goal for long-range optical quantum networks as well as modular superconducting processors within a single cryostat. We demonstrate communication and entanglement in a superconducting network with a microwave-actuated beamsplitter transformation between two bosonic qubits, which are housed in separate modules and joined by a demountable coaxial bus resonator. We transfer a qubit in a multi-photon encoding and track photon loss events to improve the fidelity, making it as high as in a single-photon encoding. Furthermore, generating entanglement with two-photon interference and postselection against loss errors produces a Bell state with success probability 79% and fidelity 0.94, halving the error obtained with a single photon. These capabilities demonstrate several promising methods for faithful operations between modules, including novel possibilities for resource-efficient direct gates.

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