Coherent Optical Control of a Quantum-Dot Spin-Qubit in a Waveguide-Based Spin-Photon Interface

Dapeng Ding; Martin Hayhurst Appel; Alisa Javadi; Xiaoyan Zhou; Matthias C. Löbl; Immo Söllner; Rüdiger Schott; Camille Papon; Tommaso Pregnolato; Leonardo Midolo; Andreas D. Wieck; Arne Ludwig; Richard J. Warburton; Tim Schröder; Peter Lodahl

doi:10.1103/PhysRevApplied.11.031002

Coherent Optical Control of a Quantum-Dot Spin-Qubit in a Waveguide-Based Spin-Photon Interface

Dapeng Ding, Martin Hayhurst Appel, Alisa Javadi, Xiaoyan Zhou, Matthias C. Löbl, Immo Söllner, Rüdiger Schott, Camille Papon, Tommaso Pregnolato, Leonardo Midolo, Andreas D. Wieck, Arne Ludwig, Richard J. Warburton, Tim Schröder, Peter Lodahl

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8 Citationer (Scopus)

Abstract

Waveguide-based spin-photon interfaces on the GaAs platform have emerged as a promising system for a variety of quantum information applications directly integrated into planar photonic circuits. The coherent control of spin states in a quantum dot can be achieved by applying circularly polarized laser pulses that may be coupled into the planar waveguide vertically through radiation modes. However, proper control of the laser polarization is challenging since the polarization is modified through the transformation from the far field to the exact position of the quantum dot in the nanostructure. Here, we demonstrate polarization-controlled excitation of a quantum-dot electron spin and use that to perform coherent control in a Ramsey interferometry experiment. The Ramsey interference reveals an inhomogeneous dephasing time of 2.2±0.1 ns, which is comparable to the values so far only obtained in bulk media. We analyze the experimental limitations in spin initialization fidelity and Ramsey contrast and identify the underlying mechanisms.

Originalsprog	Engelsk
Artikelnummer	031002
Tidsskrift	Physical Review Applied
Vol/bind	11
Antal sider	7
ISSN	2331-7019
DOI	https://doi.org/10.1103/PhysRevApplied.11.031002
Status	Udgivet - 13 mar. 2019

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10.1103/PhysRevApplied.11.031002

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Citationsformater

Ding, D., Appel, M. H., Javadi, A., Zhou, X., Löbl, M. C., Söllner, I., Schott, R., Papon, C., Pregnolato, T., Midolo, L., Wieck, A. D., Ludwig, A., Warburton, R. J., Schröder, T., & Lodahl, P. (2019). Coherent Optical Control of a Quantum-Dot Spin-Qubit in a Waveguide-Based Spin-Photon Interface. Physical Review Applied, 11, Artikel 031002. https://doi.org/10.1103/PhysRevApplied.11.031002

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title = "Coherent Optical Control of a Quantum-Dot Spin-Qubit in a Waveguide-Based Spin-Photon Interface",

abstract = "Waveguide-based spin-photon interfaces on the GaAs platform have emerged as a promising system for a variety of quantum information applications directly integrated into planar photonic circuits. The coherent control of spin states in a quantum dot can be achieved by applying circularly polarized laser pulses that may be coupled into the planar waveguide vertically through radiation modes. However, proper control of the laser polarization is challenging since the polarization is modified through the transformation from the far field to the exact position of the quantum dot in the nanostructure. Here, we demonstrate polarization-controlled excitation of a quantum-dot electron spin and use that to perform coherent control in a Ramsey interferometry experiment. The Ramsey interference reveals an inhomogeneous dephasing time of 2.2±0.1 ns, which is comparable to the values so far only obtained in bulk media. We analyze the experimental limitations in spin initialization fidelity and Ramsey contrast and identify the underlying mechanisms.",

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doi = "10.1103/PhysRevApplied.11.031002",

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T1 - Coherent Optical Control of a Quantum-Dot Spin-Qubit in a Waveguide-Based Spin-Photon Interface

AU - Ding, Dapeng

AU - Appel, Martin Hayhurst

AU - Javadi, Alisa

AU - Zhou, Xiaoyan

AU - Löbl, Matthias C.

AU - Söllner, Immo

AU - Schott, Rüdiger

AU - Papon, Camille

AU - Pregnolato, Tommaso

AU - Midolo, Leonardo

AU - Wieck, Andreas D.

AU - Ludwig, Arne

AU - Warburton, Richard J.

AU - Schröder, Tim

AU - Lodahl, Peter

PY - 2019/3/13

Y1 - 2019/3/13

N2 - Waveguide-based spin-photon interfaces on the GaAs platform have emerged as a promising system for a variety of quantum information applications directly integrated into planar photonic circuits. The coherent control of spin states in a quantum dot can be achieved by applying circularly polarized laser pulses that may be coupled into the planar waveguide vertically through radiation modes. However, proper control of the laser polarization is challenging since the polarization is modified through the transformation from the far field to the exact position of the quantum dot in the nanostructure. Here, we demonstrate polarization-controlled excitation of a quantum-dot electron spin and use that to perform coherent control in a Ramsey interferometry experiment. The Ramsey interference reveals an inhomogeneous dephasing time of 2.2±0.1 ns, which is comparable to the values so far only obtained in bulk media. We analyze the experimental limitations in spin initialization fidelity and Ramsey contrast and identify the underlying mechanisms.

AB - Waveguide-based spin-photon interfaces on the GaAs platform have emerged as a promising system for a variety of quantum information applications directly integrated into planar photonic circuits. The coherent control of spin states in a quantum dot can be achieved by applying circularly polarized laser pulses that may be coupled into the planar waveguide vertically through radiation modes. However, proper control of the laser polarization is challenging since the polarization is modified through the transformation from the far field to the exact position of the quantum dot in the nanostructure. Here, we demonstrate polarization-controlled excitation of a quantum-dot electron spin and use that to perform coherent control in a Ramsey interferometry experiment. The Ramsey interference reveals an inhomogeneous dephasing time of 2.2±0.1 ns, which is comparable to the values so far only obtained in bulk media. We analyze the experimental limitations in spin initialization fidelity and Ramsey contrast and identify the underlying mechanisms.

U2 - 10.1103/PhysRevApplied.11.031002

DO - 10.1103/PhysRevApplied.11.031002

M3 - Journal article

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JO - Physical Review Applied

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ER -

Coherent Optical Control of a Quantum-Dot Spin-Qubit in a Waveguide-Based Spin-Photon Interface

Abstract

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