Abstract
Adiabatic gate operations required to remain within the qubit subspace in an anharmonic oscillator can be slow when compared to qubit decoherence times. However, significant gate speedups are possible using methods such as derivative-removal-by-adiabatic-gate (DRAG) (Motzoi et al. in Phys Rev Lett 103:110501, 2009), which creates spectral-holes near unwanted transitions. We analyze the effect of DRAG on the transmon qubit in some detail for cosine and truncated Gaussian pulses. An accurate tight-binding multi-level transmon model is presented here along with a multi-level Lindblad model and time-evolution methods to remove phase oscillations. It is shown that in addition to DRAG, the simultaneous optimization of the pulse truncation, detuning and the pulse norm significantly reduces leakage errors. For sharply truncated Gaussian pulses, DRAG leads to faster gates that are also stable against pulse jitter. However, for slow rising pulse envelopes, DRAG is not effective. This is explained using spectral analysis. Overall this can lead to much faster reverse-engineered qubit gates soon.
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Acknowledgements
I wish to thank Alexander Korotkov for his initial participation and for his helpful comments on this manuscript. I would also like to thank Leonid Pryadko for several very helpful discussions and for his support. AD has been supported by the US Army Research Office, Grant No. W911NF-11-1-0027 and W911NF-14-1-0272, and by the NSF, Grant No. 1018935.
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De, A. Fast two-quadrature adiabatic quantum gates for weakly nonlinear qubits: a tight-binding approach. Quantum Inf Process 18, 165 (2019). https://doi.org/10.1007/s11128-019-2285-7
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DOI: https://doi.org/10.1007/s11128-019-2285-7