论文标题
光学镊子中中性费米原子的Fast Univers Universion两级Qubit Gate
Fast universal two-qubit gate for neutral fermionic atoms in optical tweezers
论文作者
论文摘要
在光学微陷阱中持有的一系列超低中性原子是量子计算的有前途的平台。该平台的主要瓶颈之一是相邻原子之间的弱耦合强度，这限制了两量门的速度。在这里，我们提出了一种用费米原子执行快速通用的正方形 - 根式栅极的方法。门的基本思想是将原子释放到两个原子之间位于两个原子之间的谐波电位。通过正确调整交互参数，原子之间的碰撞过程会产生纠缠并产生所需的栅极。我们分析地证明，在宽阔的原子波包的极限中，门的忠诚度接近统一性。我们在数值上证明，对于典型的实验参数，我们的门可以在微秒的时间尺度上运行，并达到高于0.998的忠诚度。此外，栅极持续时间与原子之间的初始距离无关。具有此类特征的门是用中性原子量子计算中全面连通性和容错性的重要里程碑。
An array of ultracold neutral atoms held in optical micro-traps is a promising platform for quantum computation. One of the major bottlenecks of this platform is the weak coupling strength between adjacent atoms, which limits the speed of two-qubit gates. Here, we present a method to perform a fast universal square-root-SWAP gate with fermionic atoms. The basic idea of the gate is to release the atoms into a harmonic potential positioned in between the two atoms. By properly tailoring the interaction parameter, the collision process between the atoms generates entanglement and yields the desired gate. We prove analytically that in the limit of broad atomic wave-packets, the fidelity of the gate approaches unity. We demonstrate numerically that with typical experimental parameters, our gate can operate on a microsecond timescale and achieves a fidelity higher than 0.998. Moreover, the gate duration is independent of the initial distance between the atoms. A gate with such features is an important milestone towards all-to-all connectivity and fault tolerance in quantum computation with neutral atoms.
