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arXiv quant-ph/0609111quant-ph
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超冷碰撞中通过交换阻塞的量子逻辑

Quantum logic via the exchange blockade in ultracold collisions

David Hayes, Paul Julienne, Ivan Deutsch

摘要:

核自旋可以充当量子开关,即使在核自旋之间以及核自旋与电子自旋之间都没有相互作用的情况下,也可以打开或关闭原子之间的超冷碰撞。这种“交换封锁”是实现量子逻辑门的一种新机制,它源于复合全同粒子的对称性,而不是量子比特之间的直接耦合。我们研究了基于这种机制的纠缠$\sqrt{\text{SWAP}}$门的实现,并将其应用于自旋为1/2的$^1S_0$双原子光镊系统中。我们评估了基于一维双高斯阱绝热演化的原理验证协议,计算了操作保真度与相互作用强度、门时间和温度的函数关系。

英文摘要:

A nuclear spin can act as a quantum switch that turns on or off ultracold collisions between atoms even when there is neither interaction between nuclear spins nor between the nuclear and electron spins. This "exchange blockade" is a new mechanism for implementing quantum logic gates that arises from the symmetry of composite identical particles, rather than direct coupling between qubits. We study the implementation of the entangling $\sqrt{\text{SWAP}}$ gate based on this mechanism for a model system of two atoms with ground electron configuration $^1S_0$, spin 1/2 nuclei, trapped in optical tweezers. We evaluate a proof-of-principle protocol based on adiabatic evolution of a one dimensional double Gaussian well, calculating fidelities of operation as a function of interaction strength, gate time, and temperature.

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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