Cavity-Enhanced Optical Readout of a Single Solid-State Spin

Cavity-Enhanced Optical Readout of a Single Solid-State Spin
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单固态自旋的腔增强光学读出

DOI:
10.1103/physrevapplied.9.054013
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发表时间:
2017
影响因子:
4.6
通讯作者:
E. Waks
E. Waks
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shuo Sun;Hyochul Kim;G. Solomon;E. Waks

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我们演示了一个单电子自旋光读出腔量子电动力学。自旋被困在一个单一的量子点,强烈耦合到纳米光子腔。选择性地将量子点的光学跃迁之一耦合到腔模式导致自旋相关的腔反射率,其通过监测入射光场的反射强度来实现投影自旋测量。使用这种方法,我们证明自旋读出保真度为0.61的量子点,具有较差的分支比为0.43。使用来自裸点的共振荧光实现这种保真度将需要光子收集效率提高43倍。
We demonstrate optical readout of a single electron spin using cavity quantum electrodynamics. The spin is trapped in a single quantum dot that is strongly coupled to a nanophotonic cavity. Selectively coupling one of the optical transitions of the quantum dot to the cavity mode results in a spin-dependent cavity reflectivity that enables projective spin measurements by monitoring the reflected intensity of an incident optical field. Using this approach, we demonstrate spin readout fidelity of 0.61 for a quantum dot that has a poor branching ratio of 0.43. Achieving this fidelity using resonance fluorescence from a bare dot would require 43 times improvement in photon collection efficiency.
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