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arXiv 1412.4337quant-phcond-mat.otherhep-lat
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人工磁场中离散时间量子行走的朗道能级

Landau levels for discrete-time quantum walks in artificial magnetic fields

Pablo Arnault, Fabrice Debbasch

AI总结:

本文提出二维离散时间量子行走的新家族,证明其连续极限对应自旋1/2费米子耦合均匀磁场,通过微扰方法构造朗道能级,数值模拟验证其有效性,并探讨量子模拟凝聚态系统的潜力。

摘要:

提出了一类新的二维离散时间量子行走(DTQWs),并证明其在连续极限下与耦合到恒定均匀磁场的自旋1/2费米子的狄拉克动力学一致。不仅通过连续极限,而且针对DTQWs(即时间步长和位置步长有限且非零的情形),采用步长微扰方法构造了朗道能级。数值模拟支持上述结果,并表明磁场解释在连续极限范围之外仍然有效。还讨论了利用DTQWs对凝聚态系统进行量子模拟的可能性。

英文摘要:

A new family of 2D discrete-time quantum walks (DTQWs) is presented and shown to coincide, in the continuous limit, with the Dirac dynamics of a spin 1/2 fermion coupled to a constant and uniform magnetic field. Landau levels are constructed, not only in the continuous limit, but also for the DTQWs i.e. for finite non-vanishing values of the time- and position-step, by a perturbative approach in the step. Numerical simulations support the above results and suggest that the magnetic interpretation is valid beyond the scope of the continuous limit. The possibility of quantum simulation of condensed-matter systems by DTQWs is also discussed.

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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