Enhancing the fidelity of two-qubit gates by measurements

被引：4
|
作者：
Gefen, Tuvia [1 ]
Cohen, Daniel [1 ]
Cohen, Itsik [1 ]
Retzker, Alex [1 ]
机构：
[1] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Givat Ram, Israel
来源：
PHYSICAL REVIEW A | 2017年 / 95卷 / 03期
基金：
以色列科学基金会;
关键词：
QUANTUM COMPUTATION; DECOHERENCE; THRESHOLD; LOGIC; IONS;
D O I：
10.1103/PhysRevA.95.032314
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Dynamical decoupling techniques are the method of choice for increasing gate fidelities. While these methods have produced very impressive results in terms of decreasing local noise and increasing the fidelities of single-qubit operations, dealing with the noise of two-qubit gates has proven more challenging. The main obstacle is that the noise time scale is shorter than the two-qubit gate itself, so that refocusing methods do not work. We present a measurement-and feedback-based method to suppress two-qubit-gate noise, which cannot be suppressed by conventional methods. We analyze in detail this method for an error model, which is relevant for trapped-ion quantum information.
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页数：9
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