Coherent Operations and Screening in Multielectron Spin Qubits

被引：49

作者：

Higginbotham, A. P. ^{[1
,2
]}

Kuemmeth, F. ^{[2
]}

Hanson, M. P. ^{[3
]}

Gossard, A. C. ^{[3
]}

Marcus, C. M. ^{[2
]}

机构：

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

[2] Niels Bohr Inst, Ctr Quantum Devices, DK-2100 Copenhagen, Denmark

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

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 02期

基金：

新加坡国家研究基金会;

关键词：

D O I：

10.1103/PhysRevLett.112.026801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Multielectron spin qubits are demonstrated, and performance examined by comparing coherent exchange oscillations in coupled single-electron and multielectron quantum dots, measured in the same device. Fast (> 1 GHz) exchange oscillations with a quality factor Q similar to 15 are found for the multielectron case, compared to Q similar to 2 for the single-electron case, the latter consistent with experiments in the literature. A model of dephasing that includes voltage and hyperfine noise is developed that is in good agreement with both single-and multielectron data, though in both cases additional exchange-independent dephasing is needed to obtain quantitative agreement across a broad parameter range.

引用

页数：5

共 31 条

[1] Pauli Spin Blockade and Influence of Hyperfine Interaction in Vertical Quantum Dot Molecule with Six-Electrons [J].

Amaha, Shinichi ;

Kodera, Tetsuo ;

Hatano, Tsuyoshi ;

Ono, Keiji ;

Tokura, Yasuhiro ;

Tarucha, Seigo ;

Gupta, James A. ;

Austing, David Guy .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2011, 80 (02)

[2] Screening of charged impurities with multielectron singlet-triplet spin qubits in quantum dots [J].

Barnes, Edwin ;

Kestner, J. P. ;

Nguyen, N. T. T. ;

Das Sarma, S. .

PHYSICAL REVIEW B, 2011, 84 (23)

[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] Dephasing time of GaAs electron-spin qubits coupled to a nuclear bath exceeding 200 μs [J].

Bluhm, Hendrik ;

Foletti, Sandra ;

Neder, Izhar ;

Rudner, Mark ;

Mahalu, Diana ;

Umansky, Vladimir ;

Yacoby, Amir .

NATURE PHYSICS, 2011, 7 (02) :109-113

[5] Mesoscopic fluctuations of the ground-state spin of a small metal particle [J].

Brouwer, PW ;

Oreg, Y ;

Halperin, BI .

PHYSICAL REVIEW B, 1999, 60 (20) :13977-13980

[6] Pauli spin blockade in carbon nanotube double quantum dots [J].

Buitelaar, M. R. ;

Fransson, J. ;

Cantone, A. L. ;

Smith, C. G. ;

Anderson, D. ;

Jones, G. A. C. ;

Ardavan, A. ;

Khlobystov, A. N. ;

Watt, A. A. R. ;

Porfyrakis, K. ;

Briggs, G. A. D. .

PHYSICAL REVIEW B, 2008, 77 (24)

[7] Electron-nuclear interaction in 13C nanotube double quantum dots [J].

Churchill, H. O. H. ;

Bestwick, A. J. ;

Harlow, J. W. ;

Kuemmeth, F. ;

Marcos, D. ;

Stwertka, C. H. ;

Watson, S. K. ;

Marcus, C. M. .

NATURE PHYSICS, 2009, 5 (05) :321-326

[8] Singlet-triplet decoherence due to nuclear spins in a double quantum dot [J].

Coish, WA ;

Loss, D .

PHYSICAL REVIEW B, 2005, 72 (12)

[9] Charge Noise Spectroscopy Using Coherent Exchange Oscillations in a Singlet-Triplet Qubit [J].

Dial, O. E. ;

Shulman, M. D. ;

Harvey, S. P. ;

Bluhm, H. ;

Umansky, V. ;

Yacoby, A. .

PHYSICAL REVIEW LETTERS, 2013, 110 (14)

[10]

Higginbotham A. P., UNPUB

← 1 2 3 4 →