Single-shot optical readout of a quantum bit using cavity quantum electrodynamics

Sun, Shuo; Waks, Edo

doi:10.1103/physreva.94.012307

Cited by 25 publications

(21 citation statements)

References 68 publications

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“…Integration of these defects into cavities should improve readout by increasing the collection efficiency and by Purcell enhancement of the radiative transitions relative to the ISC. Cavity enhancement of different optical transitions in semiconductor QDs has been successful in improving the fidelity of both readout and initialization [45][46][47].…”

Section: Discussionmentioning

confidence: 99%

Resonant Optical Spin Initialization and Readout of Single Silicon Vacancies in 4H - SiC

Banks

Soykal²,

Myers-Ward

et al. 2019

Phys. Rev. Applied

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The silicon monovacancy in 4H-SiC is a promising candidate for solid-state quantum information processing. We perform high-resolution optical spectroscopy on single V2 defects at cryogenic temperatures. We find favorable low temperature optical properties that are essential for optical readout and coherent control of its spin and for the development of a spin-photon interface. The common features among individual defects include two narrow, nearly lifetime-limited optical transitions that correspond to ms= ± 3/2 and ms= ± 1/2 spin states with no discernable zero-field splitting fluctuations. Initialization and readout of the spin states is characterized by time-resolved optical spectroscopy under resonant excitation of these transitions, showing significant differences between the ±3/2 and ±1/2 spin states. These results are well-described by a theoretical model that strengthens our understanding of the quantum properties of this defect. arXiv:1811.01293v2 [cond-mat.mes-hall]

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Section: Discussionmentioning

confidence: 99%

Resonant Optical Spin Initialization and Readout of Single Silicon Vacancies in 4H - SiC

Banks

Soykal²,

Myers-Ward

et al. 2019

Phys. Rev. Applied

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“…Let us assume our initial state is predetermined and restricted to the { 0 m s ñ | and 1 m s + ñ | } subspace, but that the fidelity decays exponentially in the number of photon pulses. The probability of each state after n pulses is then given by Bayes' theorem and a binomial distribution (similar to the treatment of a Poisson-distribution in [122]). The probability of a detection event from 0 m s ñ | and 1 m s + ñ | will be p 0 and p 1 + respectively.…”

Section: Single Photon Pulsesmentioning

confidence: 99%

“…Recently an alternative approach based on dipole-induced transparency has been proposed [118][119][120][121][122] wherein the state of the NV center changes the resonance properties of an optical cavity. More specifically, if the electronic spin in its 0 m s ñ | state, an incident photon is reflected from the cavity, while for the 1 m s + ñ | electronic spin state the photon enters the cavity where it is scattered but not absorbed by the NV center.…”

Section: Introductionmentioning

confidence: 99%

High-fidelity spin measurement on the nitrogen-vacancy center

et al. 2017

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Nitrogen-vacancy (NV) centers in diamond are versatile candidates for many quantum information processing tasks, ranging from quantum imaging and sensing through to quantum communication and fault-tolerant quantum computers. Critical to almost every potential application is an efficient mechanism for the high fidelity readout of the state of the electronic and nuclear spins. Typically such readout has been achieved through an optically resonant fluorescence measurement, but the presence of decay through a meta-stable state will limit its efficiency to the order of 99%. While this is good enough for many applications, it is insufficient for large scale quantum networks and fault-tolerant computational tasks. Here we explore an alternative approach based on dipole induced transparency (state-dependent reflection) in an NV center cavity QED system, using the most recent knowledge of the NV center's parameters to determine its feasibility, including the decay channels through the meta-stable subspace and photon ionization. We find that single-shot measurements above fault-tolerant thresholds should be available in the strong coupling regime for a wide range of cavity-center cooperativities, using a majority voting approach utilizing single photon detection. Furthermore, extremely high fidelity measurements are possible using weak optical pulses.

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“…Many confined spin systems such as quantum dot spins 16 , fluorine impurities 17 , and silicon-vacancy centers in diamond 18,19 , do not possess a good branching ratio due to non-radiative decay mechanisms or poor selection rules. In addition, the external magnetic field direction to achieve optimal branching ratio for these confined spin systems typically conflict with the condition that allows coherent optical spin manipulations 20- 23 . These qubit systems therefore require new methods for readout.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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We demonstrate optical readout of a single spin using cavity quantum electrodynamics. The spin is based on a single trapped electron in a quantum dot that has a poor branching ratio of 0.43.Selectively coupling one of the optical transitions of the quantum dot to the cavity mode results in a spin-dependent cavity reflectivity that enables spin readout by monitoring the reflected intensity of an incident optical field. Using this approach, we demonstrate spin readout fidelity of 0.61.Achieving this fidelity using resonance fluorescence from a bare dot would require 43 times improvement in photon collection efficiency. a)

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Single-shot optical readout of a quantum bit using cavity quantum electrodynamics

Cited by 25 publications

References 68 publications

Resonant Optical Spin Initialization and Readout of Single Silicon Vacancies in 4H - SiC

Resonant Optical Spin Initialization and Readout of Single Silicon Vacancies in 4H - SiC

High-fidelity spin measurement on the nitrogen-vacancy center

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

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