Data and code underlying the publication "Quantum-network nodes with real-time noise mitigation using spectator qubits"

Data and jupyter notebooks to reproduce the figures contained in the manuscript called "Quantum-network nodes with real-time noise mitigation using spectator qubits". The objective of the manuscript is to demonstrate improved quantum state storage using ancillary spectator qubits. Measurements on these spectator qubits reveal information about the (correlated) noise that has acted on the memory qubit, that can then be (partially) corrected in real time. The dataset contains simulations and measurements on using spectator qubits in the context of generating entanglement between distant NV centers in diamond. Surrounding nuclear spins act as memory qubit and spectator qubits. We demonstrate both a measurement-based implementation of the spectator qubit protocol and identify that measurements impart additional dephasing. We bypass these measurements in a gate-based implementation. Based on our measurements we show the spectator-induced improvements in memory fidelity for different entanglement generation success probabilities.

本数据集包含用于复现题为《使用旁观量子比特（spectator qubits）实现实时噪声抑制的量子网络节点》的学术论文中所有图表的数据与Jupyter Notebook。该论文的研究目标为验证利用辅助旁观量子比特（ancillary spectator qubits）提升量子态存储性能的可行性：对这些旁观量子比特的测量能够获取作用于存储量子比特的（关联）噪声信息，进而可实时（部分）抵消该噪声带来的影响。本数据集涵盖在金刚石中远距离氮-空位中心（NV centers）之间生成纠缠的场景下，使用旁观量子比特的相关模拟与实验测量数据，其中周围的核自旋可充当存储量子比特与旁观量子比特。本研究分别实现了基于测量的旁观量子比特协议，并发现测量过程会引入额外的退相位效应；我们在基于量子门的实现方案中规避了此类测量操作。基于实验测量结果，我们验证了在不同纠缠生成成功概率下，旁观量子比特带来的存储保真度提升效果。