论文标题
选择性噪声门
Selective Noise Resistant Gate
论文作者
论文摘要
在基于自旋的量子寄存器中实现单个Qubit的个人控制是由于量子位共振频率的紧密距离，这是一个不断增加的挑战。当前的方案通常会遭受富达和Qubits选择性之间固有的权衡。在这里，我们报告了一种新方案，该方案通过动力学去耦和基于磁梯度的选择性结合噪声保护，以提高忠诚度和选择性。在Diamond的一个氮气接种中心的情况下，我们在实验上展示了富裕性= 0.9 $ \ pm $ 0.02和50 kHz光谱带宽的量子门，这几乎是比未受保护的带宽较窄的数量级。我们的方案将在相互作用的Qubits阵列中使用相对中等的梯度在相互作用的Qubits阵列中进行选择性控制，约为1 mg/nm。
Realizing individual control on single qubits in a spin-based quantum register is an ever-increasing challenge due to the close proximity of the qubits resonance frequencies. Current schemes typically suffer from an inherent trade-off between fidelity and qubits selectivity. Here, we report on a new scheme which combines noise protection by dynamical decoupling and magnetic gradient based selectivity, to enhance both the fidelity and the selectivity. With a single nitrogen-vacancy center in diamond, we experimentally demonstrate quantum gates with fidelity = 0.9 $\pm$ 0.02 and a 50 kHz spectral bandwidth, which is almost an order of magnitude narrower than the unprotected bandwidth. Our scheme will enable selective control of an individual nitrogen-vacancy qubit in an interacting qubits array using relatively moderate gradients of about 1 mG/nm.
