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arXiv 2004.01638quant-ph
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利用分子固体作为按比例放大的量子比特

Using Molecular Solids as Scaled-up Qubits

Malcolm P. Roberts

摘要:

提出的按比例放大的量子比特是在非常低的温度下显示大幅度运动的分子和捕获它们的矩阵。这些包括离子固体,例如稀释在氙基质中的四苯硼酸铵(ATPB)或甲烷。以这种方式,从一开始就存在大量的量子比特。每种量子比特都有许多感兴趣的跃迁,这些跃迁是使用各种成熟的实验技术在10到3300 cm-1的频率范围内观察到的(不需要外部场,超低温或超高真空条件)。详细描述了ATPB中的过渡。其中包括:(i)铵离子量子比特的IR N-H不对称振动,其在四苯硼酸盐基质内几乎自由地围绕其C3轴旋转。这导致多级振动取向,其即使在非常低的温度下也由于前三个取向水平之间的核自旋冻结而呈现多个带。取向水平和可能性之间的可控隧穿频率,以控制量子比特间的距离,使这个量子比特一个强有力的候选人,同时产生大的纠缠和稳定的叠加在不同的实验设置;和(ii)拉曼允许正常模式的四苯硼酸根阴离子量子比特。这些都是实验解决从非常低的温度高达300 K。进一步的量子位的例子和感兴趣的转变进行检查。使用这种方法,在给定或多个位置中使用多晶体阵列的实验设置成为可能。

英文摘要:

The scaled-up qubits proposed are molecules which display large amplitude motions at very low temperatures and the matrix that traps them. These comprise ionic solids such as ammonium tetraphenylborate (ATPB) or methane dilute in a xenon matrix. In this manner, an enormous number qubits are present from inception. Each kind of qubit has a multiplicity of transitions of interest which are observed (without the need of external fields, ultra-low temperatures or ultra-high vacuum conditions) using diverse well established experimental techniques at frequencies ranging from 10 to 3300 cm-1. Described in detail are the transitions in ATPB. These include: (i) the IR N-H asymmetric vibration of the ammonium ion qubit which nearly freely rotate about their C3 axes inside the tetraphenylborate matrix. This results in a multi-level vibration-orientation which exhibits multiple bands even at very low temperatures due to nuclear spin freezing between the first three orientation levels. Accessible tunneling frequencies between the orientation levels and the possibility to control inter-qubit distance make this qubit a strong candidate to generate concurrently large entanglement and stable superposition in diverse experimental set-ups; and (ii) the Raman allowed normal modes of the tetraphenylborate anion qubit. These are experimentally resolved from very low temperatures up to 300 K. Further qubit examples and transitions of interest are examined. Experimental setups with multi-crystal arrays, both in a given or several locations, become possible using this approach.

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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