Efficient Z gates for quantum computing

被引：406

作者：

Mckay, David C. ^{[1
]}

Wood, Christopher J. ^{[1
]}

Sheldon, Sarah ^{[1
]}

Chow, Jerry M. ^{[1
]}

Gambetta, Jay M. ^{[1
]}

机构：

[1] IBM Corp, TJ Watson Res Ctr, Yorktown Hts, NY 10598 USA

来源：

PHYSICAL REVIEW A | 2017年 / 96卷 / 02期

关键词：

CODE;

D O I：

10.1103/PhysRevA.96.022330

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

For superconducting qubits, microwave pulses drive rotations around the Bloch sphere. The phase of these drives can be used to generate zero-duration arbitrary virtual Z gates, which, combined with two X-pi/2 gates, can generate any SU(2) gate. Here we show how to best utilize these virtual Z gates to both improve algorithms and correct pulse errors. We perform randomized benchmarking using a Clifford set of Hadamard and Z gates and show that the error per Clifford is reduced versus a set consisting of standard finite-durationX and Y gates. Z gates can correct unitary rotation errors for weakly anharmonic qubits as an alternative to pulse-shaping techniques such as derivative removal by adiabatic gate (DRAG). We investigate leakage and show that a combination of DRAG pulse shaping to minimize leakage and Z gates to correct rotation errors realizes a 13.3 ns X-pi/2 gate characterized by low error [1.95(3) x 10(-4)] and low leakage [3.1(6) x 10(-6)]. Ultimately leakage is limited by the finite temperature of the qubit, but this limit is two orders of magnitude smaller than pulse errors due to decoherence.

引用

页数：8

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