State Initialization of a Hot Spin Qubit in a Double Quantum Dot by Measurement-Based Quantum Feedback Control

• URL: http://arxiv.org/abs/2204.02565v2
• Date: Fri, 11 Nov 2022 15:26:37 GMT
• Title: State Initialization of a Hot Spin Qubit in a Double Quantum Dot by Measurement-Based Quantum Feedback Control
• Authors: Azzouz Aarab, R\'emi Azouit, Vincent Reiher, Yves B\'erub\'e-Lauzi\`ere
• Abstract summary: The protocol robustly prepares the spin in shorter time and reach a higher fidelity, which can be pre-set. It is also effective at high temperatures, which is critical for the current efforts towards scaling up the number of qubits in quantum computers.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A measurement-based quantum feedback protocol is developed for spin state initialization in a gate-defined double quantum dot spin qubit coupled to a superconducting resonator. The protocol improves qubit state initialization as it is able to robustly prepare the spin in shorter time and reach a higher fidelity, which can be pre-set. Being able to pre-set the fidelity aimed at is a highly desired feature enabling qubit initialization to be more deterministic. The protocol developed herein is also effective at high temperatures, which is critical for the current efforts towards scaling up the number of qubits in quantum computers.

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