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arXiv 2007.03869cond-mat.mes-hallquant-ph
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半导体量子点自旋链中的绝热量子态转移

Adiabatic quantum state transfer in a semiconductor quantum-dot spin chain

Yadav P. Kandel, Haifeng Qiao, Saeed Fallahi, Geoffrey C. Gardner, Michael J. Manfra, John M. Nichol

摘要:

半导体量子点自旋量子比特是一种很有前途的量子计算平台,因为它们具有可扩展性和长的相干时间。然而,为了实现这种全部潜力,需要用于量子纠错的高保真信息传输机制和有效算法。在这里,我们提出的证据绝热量子态转移链的半导体量子点电子自旋。通过对交换耦合进行精细的修改,我们在不到127 ns的时间内在远距离电子之间转移单自旋和双自旋态。我们还表明,这种方法可以级联的自旋态转移在长自旋链。基于模拟,我们估计在所研究的实验参数下,正确转移单自旋本征态和双自旋单重态的概率可以超过0.95。在未来,将需要状态和过程层析成像来验证具有超过经典界限的保真度的任意单量子比特状态的传输。绝热量子态转移对噪声和脉冲定时误差具有鲁棒性。该方法对基于门的量子计算中大自旋量子位阵列的初始化、态分布和读出等问题具有重要意义。这也为在半导体量子点自旋量子比特中进行通用绝热量子计算提供了可能。

英文摘要:

Semiconductor quantum-dot spin qubits are a promising platform for quantum computation, because they are scalable and possess long coherence times. In order to realize this full potential, however, high-fidelity information transfer mechanisms are required for quantum error correction and efficient algorithms. Here, we present evidence of adiabatic quantum-state transfer in a chain of semiconductor quantum-dot electron spins. By adiabatically modifying exchange couplings, we transfer single- and two-spin states between distant electrons in less than 127 ns. We also show that this method can be cascaded for spin-state transfer in long spin chains. Based on simulations, we estimate that the probability to correctly transfer single-spin eigenstates and two-spin singlet states can exceed 0.95 for the experimental parameters studied here. In the future, state and process tomography will be required to verify the transfer of arbitrary single qubit states with a fidelity exceeding the classical bound. Adiabatic quantum-state transfer is robust to noise and pulse-timing errors. This method will be useful for initialization, state distribution, and readout in large spin-qubit arrays for gate-based quantum computing. It also opens up the possibility of universal adiabatic quantum computing in semiconductor quantum-dot spin qubits.

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