论文标题
激发上的光学多Qubit Gate操作阻滞了原子量子寄存器
Optical multi-qubit gate operations on an excitation blockaded atomic quantum register
论文作者
论文摘要
我们考虑了一个具有两个计算接地态的原子或离子的多量系统系统，并且在所谓的封锁状态下具有相互作用的激发态，因此任何时候只能激发一个量子。此类系统的例子是稀土离子掺杂的晶体和被困在镊子阵列中的中性原子。我们提出了一个简单的激光激发协议，该协议在任何所需的多量产品状态上产生一个复杂的相位因子，并且可用于实现多数门（例如N位Toffoli门）。该操作仅使用两个脉冲执行，每个脉冲同时介绍所有量子位。通过使用复杂的双曲线脱离脉冲，我们的方案是稳健的，尽管相互作用参数的差异差异，但允许往返激发态的完整转移。提供了对多Qubit Gate性能的详细分析。
We consider a multi-qubit system of atoms or ions with two computational ground states and an interacting excited state in the so-called blockade regime, such that only one qubit can be excited at any one time. Examples of such systems are rare-earth-ion-doped crystals and neutral atoms trapped in tweezer arrays. We present a simple laser excitation protocol that yields a complex phase factor on any desired multi-qubit product state, and which can be used to implement multi-qubit gates such as the n-bit Toffoli gates. The operation is performed using only two pulses, where each pulse simultaneously address all qubits. By the use of complex hyperbolic secant pulses our scheme is robust and permits complete transfers to and from the excited states despite the variability of interaction parameters. A detailed analysis of the multi-qubit gate performance is provided.
