Repetitive Readout of a Single Electronic Spin via Quantum Logic with Nuclear Spin Ancillae

被引：285

作者：

Jiang, L. ^{[1
]}

Hodges, J. S. ^{[1
,2
]}

Maze, J. R. ^{[1
]}

Maurer, P. ^{[1
]}

Taylor, J. M. ^{[3
]}

Cory, D. G. ^{[2
]}

Hemmer, P. R. ^{[4
]}

Walsworth, R. L. ^{[1
,5
]}

Yacoby, A. ^{[1
]}

Zibrov, A. S. ^{[1
]}

Lukin, M. D. ^{[1
]}

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[2] MIT, Dept Nucl Sci & Engn, Cambridge, MA 02139 USA

[3] MIT, Dept Phys, Cambridge, MA 02139 USA

[4] Texas A&M Univ, Dept Elect & Comp Engn, College Stn, TX 77843 USA

[5] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

来源：

SCIENCE | 2009年 / 326卷 / 5950期

基金：

美国国家科学基金会;

关键词：

DIAMOND; ENTANGLEMENT; ALGORITHMS; DYNAMICS; QUBITS;

D O I：

10.1126/science.1176496

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Robust measurement of single quantum bits plays a key role in the realization of quantum computation and communication as well as in quantum metrology and sensing. We have implemented a method for the improved readout of single electronic spin qubits in solid-state systems. The method makes use of quantum logic operations on a system consisting of a single electronic spin and several proximal nuclear spin ancillae in order to repetitively readout the state of the electronic spin. Using coherent manipulation of a single nitrogen vacancy center in room-temperature diamond, full quantum control of an electronic-nuclear system consisting of up to three spins was achieved. We took advantage of a single nuclear-spin memory in order to obtain a 10-fold enhancement in the signal amplitude of the electronic spin readout. We also present a two-level, concatenated procedure to improve the readout by use of a pair of nuclear spin ancillae, an important step toward the realization of robust quantum information processors using electronic-and nuclear-spin qubits. Our technique can be used to improve the sensitivity and speed of spin-based nanoscale diamond magnetometers.

引用

页码：267 / 272

页数：6

共 31 条

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