Related papers: Cat-qubit-inspired gate on cos($2\theta$) qubits

Cat-qubit-inspired gate on cos($2\theta$) qubits

URL: http://arxiv.org/abs/2304.02155v1
Date: Tue, 4 Apr 2023 23:06:22 GMT
Title: Cat-qubit-inspired gate on cos($2\theta$) qubits
Authors: Catherine Leroux and Alexandre Blais
Abstract summary: We introduce a single-qubit $Z$ gate inspired by the noise-bias preserving gate of the Kerr-cat qubit. This scheme relies on a $pi$ rotation in phase space via a beamsplitter-like transformation between a qubit and ancilla qubit.
Score: 77.34726150561087
License: http://creativecommons.org/licenses/by/4.0/
Abstract: For $\cos(2\theta)$ qubits based on voltage-controlled semiconductor nanowire Josephson junctions we introduce a single-qubit $Z$ gate inspired by the noise-bias preserving gate of the Kerr-cat qubit. This scheme relies on a $\pi$ rotation in phase space via a beamsplitter-like transformation between a qubit and ancilla qubit. The rotation is implemented by adiabatically changing the potential energies of the two qubits such as to preserve a double-well potential at all times. This gate constrains the dynamics in the subspace of a $\cos(2\theta)$ qubit at all times, therefore yielding high-fidelity operation while preserving the qubit's coherence. We introduce a circuit to realize this gate and support our findings with numerical simulations.

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