Interlaced Dynamical Decoupling and Coherent Operation of a Singlet-Triplet Qubit

被引：121

作者：

Barthel, C. ^{[1
]}

Medford, J. ^{[1
]}

Marcus, C. M. ^{[1
]}

Hanson, M. P. ^{[2
]}

Gossard, A. C. ^{[2
]}

机构：

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

[2] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 26期

关键词：

ELECTRON-SPIN; QUANTUM-DOT;

D O I：

10.1103/PhysRevLett.105.266808

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We experimentally demonstrate coherence recovery of singlet-triplet superpositions by interlacing qubit rotations between Carr-Purcell (CP) echo sequences. We then compare the performance of Hahn, CP, concatenated dynamical decoupling (CDD), and Uhrig dynamical decoupling for singlet recovery. In the present case, where gate noise and drift combined with spatially varying hyperfine coupling contribute significantly to dephasing, and pulses have limited bandwidth, CP and CDD yield comparable results, with T(2) similar to 80 mu s.

引用

收藏

页数：4

相关论文

共 23 条

[1] Electrical control of spin relaxation in a quantum dot [J].

Amasha, S. ;

MacLean, K. ;

Radu, Iuliana P. ;

Zumbuehl, D. M. ;

Kastner, M. A. ;

Hanson, M. P. ;

Gossard, A. C. .

PHYSICAL REVIEW LETTERS, 2008, 100 (04)

[2] Fast sensing of double-dot charge arrangement and spin state with a radio-frequency sensor quantum dot [J].

Barthel, C. ;

Kjaergaard, M. ;

Medford, J. ;

Stopa, M. ;

Marcus, C. M. ;

Hanson, M. P. ;

Gossard, A. C. .

PHYSICAL REVIEW B, 2010, 81 (16)

[3] Rapid Single-Shot Measurement of a Singlet-Triplet Qubit [J].

Barthel, C. ;

Reilly, D. J. ;

Marcus, C. M. ;

Hanson, M. P. ;

Gossard, A. C. .

PHYSICAL REVIEW LETTERS, 2009, 103 (16)

[4] Optimized dynamical decoupling in a model quantum memory [J].

Biercuk, Michael J. ;

Uys, Hermann ;

VanDevender, Aaron P. ;

Shiga, Nobuyasu ;

Itano, Wayne M. ;

Bollinger, John J. .

NATURE, 2009, 458 (7241) :996-1000

[5]

BLUHM H, NATURE PHYS IN PRESS

[6] EFFECTS OF DIFFUSION ON FREE PRECESSION IN NUCLEAR MAGNETIC RESONANCE EXPERIMENTS [J].

CARR, HY ;

PURCELL, EM .

PHYSICAL REVIEW, 1954, 94 (03) :630-638

[7]

Elzerman JM, 2004, NATURE, V430, P431, DOI 10.1039/nature02693

[8] SPIN ECHOES [J].

HAHN, EL .

PHYSICAL REVIEW, 1950, 80 (04) :580-594

[9] Performance of deterministic dynamical decoupling schemes: Concatenated and periodic pulse sequences [J].

Khodjasteh, Kaveh ;

Lidar, Daniel A. .

PHYSICAL REVIEW A, 2007, 75 (06)

[10] Universal pulse sequence to minimize spin depahasing in the central spin decoherence problem [J].

Lee, B. ;

Witzel, W. M. ;

Das Sarma, S. .

PHYSICAL REVIEW LETTERS, 2008, 100 (16)