SWAP gate between a Majorana qubit and a parity-protected superconducting qubit

• URL: http://arxiv.org/abs/2205.01410v1
• Date: Tue, 3 May 2022 10:41:27 GMT
• Title: SWAP gate between a Majorana qubit and a parity-protected superconducting qubit
• Authors: Luca Chirolli, Norman Y. Yao, Joel E. Moore
• Abstract summary: A parity-protected superconducting qubit is directly coupled to a Majorana qubit, which plays the role of a quantum memory. This architecture combines fast gates, which can be realized with the superconducting qubit, with a topologically protected Majorana memory.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: High fidelity quantum information processing requires a combination of fast gates and long-lived quantum memories. In this work, we propose a hybrid architecture, where a parity-protected superconducting qubit is directly coupled to a Majorana qubit, which plays the role of a quantum memory. The superconducting qubit is based upon a $\pi$-periodic Josephson junction realized with gate-tunable semiconducting wires, where the tunneling of individual Cooper pairs is suppressed. One of the wires additionally contains four Majorana zero modes that define a qubit. We demonstrate that this enables the implementation of a SWAP gate, allowing for the transduction of quantum information between the topological and conventional qubit. This architecture combines fast gates, which can be realized with the superconducting qubit, with a topologically protected Majorana memory.

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