Noise Suppression Using Symmetric Exchange Gates in Spin Qubits

Frederico Martins; Filip Kazimierz Malinowski; Peter Dahl Nissen; Edwin Barnes; Saeed  Fallahi; Geoffrey C. Gardner; Michael J. Manfra; Charles M. Marcus; Ferdinand Kuemmeth

doi:10.1103/physrevlett.116.116801

Noise Suppression Using Symmetric Exchange Gates in Spin Qubits

Frederico Martins, Filip Kazimierz Malinowski, Peter Dahl Nissen, Edwin Barnes, Saeed Fallahi, Geoffrey C. Gardner, Michael J. Manfra, Charles M. Marcus, Ferdinand Kuemmeth

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124 Citationer (Scopus)

Abstract

We demonstrate a substantial improvement in the spin-exchange gate using symmetric control instead of conventional detuning in GaAs spin qubits, up to a factor of six increase in the quality factor of the gate. For symmetric operation, nanosecond voltage pulses are applied to the barrier that controls the interdot potential between quantum dots, modulating the exchange interaction while maintaining symmetry between the dots. Excellent agreement is found with a model that separately includes electrical and nuclear noise sources for both detuning and symmetric gating schemes. Unlike exchange control via detuning, the decoherence of symmetric exchange rotations is dominated by rotation-axis fluctuations due to nuclear field noise rather than direct exchange noise.

Originalsprog	Engelsk
Artikelnummer	116801
Tidsskrift	Physical Review Letters
Vol/bind	116
ISSN	0031-9007
DOI	https://doi.org/10.1103/physrevlett.116.116801
Status	Udgivet - 16 mar. 2016

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10.1103/physrevlett.116.116801

PhysRevLett.116.116801Forlagets udgivne version, 712 KB

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AU - Martins, Frederico

AU - Malinowski, Filip Kazimierz

AU - Nissen, Peter Dahl

AU - Barnes, Edwin

AU - Fallahi, Saeed

AU - Gardner, Geoffrey C.

AU - Manfra, Michael J.

AU - Marcus, Charles M.

AU - Kuemmeth, Ferdinand

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N2 - We demonstrate a substantial improvement in the spin-exchange gate using symmetric control instead of conventional detuning in GaAs spin qubits, up to a factor of six increase in the quality factor of the gate. For symmetric operation, nanosecond voltage pulses are applied to the barrier that controls the interdot potential between quantum dots, modulating the exchange interaction while maintaining symmetry between the dots. Excellent agreement is found with a model that separately includes electrical and nuclear noise sources for both detuning and symmetric gating schemes. Unlike exchange control via detuning, the decoherence of symmetric exchange rotations is dominated by rotation-axis fluctuations due to nuclear field noise rather than direct exchange noise.

AB - We demonstrate a substantial improvement in the spin-exchange gate using symmetric control instead of conventional detuning in GaAs spin qubits, up to a factor of six increase in the quality factor of the gate. For symmetric operation, nanosecond voltage pulses are applied to the barrier that controls the interdot potential between quantum dots, modulating the exchange interaction while maintaining symmetry between the dots. Excellent agreement is found with a model that separately includes electrical and nuclear noise sources for both detuning and symmetric gating schemes. Unlike exchange control via detuning, the decoherence of symmetric exchange rotations is dominated by rotation-axis fluctuations due to nuclear field noise rather than direct exchange noise.

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DO - 10.1103/physrevlett.116.116801

M3 - Journal article

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SN - 0031-9007

VL - 116

JO - Physical Review Letters

JF - Physical Review Letters

M1 - 116801

ER -

Noise Suppression Using Symmetric Exchange Gates in Spin Qubits

Abstract

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