Highly tunable exchange-only singlet-only qubit in a GaAs triple quantum dot

Sala, Arnau; Qvist, Jørgen Holme; Danon, Jeroen

doi:10.1103/physrevresearch.2.012062

Cited by 14 publications

(7 citation statements)

References 47 publications

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“…Exchange coupling also allows rapid and high-fidelity initialization and readout of pairs of spins. As a result, exchange coupling underlies the operation of electron-spin qubits consisting of two [7,8], three [9][10][11][12][13][14], or more [15][16][17] electrons. Superexchange [18,19] in multielectron systems and extended exchange-coupled spin chains can enable new forms of quantum information transfer [20,21] and the generation of many-body entangled states [22].…”

Section: Introductionmentioning

confidence: 99%

Coherent Multispin Exchange Coupling in a Quantum-Dot Spin Chain

et al. 2020

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Heisenberg exchange coupling between neighboring electron spins in semiconductor quantum dots provides a powerful tool for quantum information processing and simulation. Although so far unrealized, extended Heisenberg spin chains can enable long-distance quantum information transfer and the generation of nonequilibrium quantum states. In this work, we implement simultaneous, coherent exchange coupling between all nearest-neighbor pairs of spins in a quadruple quantum dot. The main challenge in implementing simultaneous exchange couplings is the nonlinear and nonlocal dependence of the exchange couplings on gate voltages. Through a combination of electrostatic simulation and theoretical modeling, we show that this challenge arises primarily due to lateral shifts of the quantum dots during gate pulses. Building on this insight, we develop two models that can be used to predict the confinement gate voltages for a desired set of exchange couplings. Although the model parameters depend on the number of exchange couplings desired (suggesting that effects in addition to lateral wave-function shifts are important), the models are sufficient to enable simultaneous and independent control of all three exchange couplings in a quadruple quantum dot. We demonstrate two-, three-, and four-spin exchange oscillations, and our data agree with simulations.

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Section: Introductionmentioning

confidence: 99%

Coherent Multispin Exchange Coupling in a Quantum-Dot Spin Chain

et al. 2020

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“…The YSR singlet qubits are relatively insensitive to magnetic field noise and do not require any magnetic flux tuning through superconducting loops and are in this aspect similar to spin singlet qubits 82,83 . The robustness with respect to magnetic field weakly depends on the g-factors of the subsystems (QD vs. SC islands).…”

Section: Discussionmentioning

confidence: 98%

Qubit based on spin-singlet Yu-Shiba-Rusinov states

Pavešić,

Žitko

2021

Preprint

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“…• Multi-dot spin qubits: Generalizing the singlet-triplet and exchange-only qubits to collective spin states of multi-dot systems, the quadrupolar exchange-only (QUEX 35 ) qubit and the exchange-only singlet-only (XOSO 36 ) qubit were recently proposed. Both of them exploit a decoherence-free subspace at an extended charge sweet-spot, and potentially can be operated fast, either resonantly or via electrical voltages.…”

Section: Qubit Encodingsmentioning

confidence: 99%

Semiconductor Qubits In Practice

Chatterjee,

Stevenson,

De Franceschi

et al. 2020

Preprint

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In recent years semiconducting qubits have undergone a remarkable evolution, making great strides in overcoming decoherence as well as in prospects for scalability, and have become one of the leading contenders for the development of large-scale quantum circuits. In this Review we describe the current state of the art in semiconductor charge and spin qubits based on gate-controlled semiconductor quantum dots, shallow dopants, and color centers in wide band gap materials. We frame the relative strengths of the different semiconductor qubit implementations in the context of quantum simulations, computing, sensing and networks. By highlighting the status and future perspectives of the basic types of semiconductor qubits, this Review aims to serve as a technical introduction for non-specialists as well as a forward-looking reference for scientists intending to work in this field.

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Highly tunable exchange-only singlet-only qubit in a GaAs triple quantum dot

Cited by 14 publications

References 47 publications

Coherent Multispin Exchange Coupling in a Quantum-Dot Spin Chain

Coherent Multispin Exchange Coupling in a Quantum-Dot Spin Chain

Qubit based on spin-singlet Yu-Shiba-Rusinov states

Semiconductor Qubits In Practice

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