High-fidelity error-resilient composite phase gates

Abstract

We present a method to construct high-fidelity quantum phase gates, which are insensitive to errors in various experimental parameters. The phase gates consist of a pair of two sequential broadband composite pulses, with a phase difference $\pi +\alpha /2$ between them, where $\alpha$ is the desired gate phase. By using composite pulses which compensate systematic errors in the pulse area, the frequency detuning, or both the area and the detuning, we thereby construct composite phase gates which compensate errors in the same parameters. Particularly interesting are phase gates which use the recently discovered universal composite pulses, which compensate systematic errors in any parameter of the driving field, which keep the evolution Hermitian (e.g., pulse amplitude and duration, pulse shape, frequency detuning, Stark shifts, residual frequency chirps, etc.

5 pages, 4 figures

References in corpus (5)

• Polynomial-Time Algorithms for Prime Factorization and Discrete Logarithms on a Quantum Computer
• Quantum Mechanics helps in searching for a needle in a haystack
• Geometric Quantum Computation
• Correction of Arbitrary Errors in Population Inversion of Quantum Systems by Universal Composite Pulses
• High-fidelity local addressing of trapped ions and atoms by composite sequences of laser pulses

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• Dynamical-Corrected Nonadiabatic Geometric Quantum Computation
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• Robust and Parallel Control of Many Qubits