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arXiv 2201.05114quant-phcond-mat.supr-con
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超导量子计算机的基本极限

Fundamental limits of superconducting quantum computers

Michele Vischi, Luca Ferialdi, Andrea Trombettoni, Angelo Bassi

摘要:

连续自发局域化(CSL)模型是量子力学的另一种表述,它引入了非线性耦合到波函数的噪声来解释其坍缩。我们考虑了超导transmon量子比特量子计算机的CSL效应。作为一个直接的影响CSL减少量子比特的计算基础状态的量子叠加:我们显示的减少率是微不足道的小。然而,CSL的间接效应,即噪声引起的耗散,也会通过产生额外的准粒子导致transmon量子位退相干。由于传输子量子比特的退相干速率依赖于准粒子密度,通过计算CSL诱导的量子比特产生速率,可以估计相应的准粒子密度,从而估计CSL对传输子量子计算机性能的限制。我们表明,CSL可能会破坏大型设备上的实际算法的量子计算。我们进一步探讨了在超导器件上测试CSL效应的可能性。

英文摘要:

The Continuous Spontaneous Localization (CSL) model is an alternative formulation of quantum mechanics which introduces a noise coupled non linearly to the wave function to account for its collapse. We consider CSL effects on quantum computers made of superconducting transmon qubits. As a direct effect CSL reduces quantum superpositions of the computational basis states of the qubits: we show the reduction rate to be negligibly small. However, an indirect effect of CSL, dissipation induced by the noise, also leads transmon qubits to decohere, by generating additional quasiparticles. Since the decoherence rate of transmon qubits depends on the quasiparticle density, by computing their generation rate induced by CSL, we can estimate the corresponding quasiparticle density and thus the limit set by CSL on the performances of transmon quantum computers. We show that CSL could spoil the quantum computation of practical algorithms on large devices. We further explore the possibility of testing CSL effects on superconducting devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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