Experimental limits on the fidelity of adiabatic geometric phase gates in a single solid-state spin qubit

Zhang, Kai; Nusran, N. M.; Slezak, B. R.; Dutt, M. V. Gurudev

doi:10.1088/1367-2630/18/5/053029

Title: Experimental limits on the fidelity of adiabatic geometric phase gates in a single solid-state spin qubit

Journal Article · Sun May 01 00:00:00 EDT 2016 · New Journal of Physics

DOI:https://doi.org/10.1088/1367-2630/18/5/053029· OSTI ID:1253424

Zhang, Kai; Nusran, N. M.; Slezak, B. R.; Dutt, M. V. Gurudev

While it is often thought that the geometric phase is less sensitive to fluctuations in the control fields, a very general feature of adiabatic Hamiltonians is the unavoidable dynamic phase that accompanies the geometric phase. The effect of control field noise during adiabatic geometric quantum gate operations has not been probed experimentally, especially in the canonical spin qubit system that is of interest for quantum information. We present measurement of the Berry phase and carry out adiabatic geometric phase gate in a single solid-state spin qubit associated with the nitrogen-vacancy center in diamond. We manipulate the spin qubit geometrically by careful application of microwave radiation that creates an effective rotating magnetic field, and observe the resulting Berry phase signal via spin echo interferometry. Our results show that control field noise at frequencies higher than the spin echo clock frequency causes decay of the quantum phase, and degrades the fidelity of the geometric phase gate to the classical threshold after a few (~10) operations. This occurs in spite of the geometric nature of the state preparation, due to unavoidable dynamic contributions. In conclusion, we have carried out systematic analysis and numerical simulations to study the effects of the control field noise and imperfect driving waveforms on the quantum phase gate.

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Research Organization:: Univ. of Pittsburgh, Pittsburgh, PA (United States). Dept. of Physics and Astronomy

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC 0006638; SC0006638

OSTI ID:: 1253424

Alternate ID(s):: OSTI ID: 1253426; OSTI ID: 1282051

Journal Information:: New Journal of Physics, Journal Name: New Journal of Physics Vol. 18 Journal Issue: 5; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 8 works

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Observation of a Quantum Phase from Classical Rotation of a Single Spin Wood, A. A.; Hollenberg, L. C. L.; Scholten, R. E. Physical Review Letters, Vol. 124, Issue 2 https://doi.org/10.1103/physrevlett.124.020401	journal	January 2020

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
diamond
NV center
Berry phase
geometric phase
experimental realization
quantum computation

Title: Experimental limits on the fidelity of adiabatic geometric phase gates in a single solid-state spin qubit

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