High-fidelity ion-trap quantum computing with hyperfine clock states

被引：16

作者：

Aolita, L. ^{[1
,2
]}

Kim, K. ^{[3
]}

Benhelm, J. ^{[3
]}

Roos, C. F. ^{[3
,4
]}

Haeffner, H. ^{[3
,4
]}

机构：

[1] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, Brazil

[2] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[3] Univ Innsbruck, Inst Experimentalphys, A-6020 Innsbruck, Austria

[4] Osterreichischen Akad Wissenschaften, Inst Quantenopt & Quanteninformat, A-6020 Innsbruck, Austria

来源：

PHYSICAL REVIEW A | 2007年 / 76卷 / 04期

关键词：

D O I：

10.1103/PhysRevA.76.040303

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We propose the implementation of a geometric-phase gate on magnetic-field-insensitive qubits with (sigma) over cap (z)-dependent forces for trapped ion quantum computing. The force is exerted by two laser beams in a Raman configuration. Qubit-state dependency is achieved by a small frequency detuning from the virtually excited state. Ion species with excited states of long radiative lifetimes are used to reduce the chance of a spontaneous photon emission to less than 10(-8) per gate run. This eliminates the main source of gate infidelity in previous implementations. With this scheme it seems possible to reach the fault-tolerant threshold.

引用

页数：4

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