Gate Fidelity and Gate Driven Dephasing via Time-Dependent Bloch-Redfield Master Equation

• URL: http://arxiv.org/abs/2410.06292v1
• Date: Tue, 8 Oct 2024 18:50:20 GMT
• Title: Gate Fidelity and Gate Driven Dephasing via Time-Dependent Bloch-Redfield Master Equation
• Authors: Sirui Chen, Dragomir Davidović,
• Abstract summary: This work examines driven qubit evolution in a bath of linear harmonic oscillators with a fast external drive. The interaction with the bath is investigated for its effect on gate fidelity.
• Score: 0.6036360355596617
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Understanding how the microscopic properties of open quantum systems affect gate functionality is essential for developing high-quality quantum gates. This work examines driven qubit evolution in a bath of linear harmonic oscillators with a fast external drive. The dynamically prepared state technique and the time-dependent Bloch-Redfield master equation allow for accurate state coherence calculations. This technique eliminates reaction delays for relaxation dynamics and corrects inaccurate dephasing rates caused by factorized initial states in traditional master equations. Furthermore, the interaction with the bath is investigated for its effect on gate fidelity. As a function of the qubit rotation angle, the gate fidelity is minimal for the {\pi}-flip and partially recovers with the 2{\pi}-flip.

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