标题： 弗洛凯增强的自旋交换 显示英文标题

标题： Floquet-Enhanced Spin Swaps

摘要： 量子系统之间信息的传递对于量子通信和计算至关重要。 在量子计算机中，量子比特之间的高连通性可以提高算法的效率，协助错误校正，并实现高保真度的读取。 然而，与所有量子门一样，量子比特之间传递信息的操作可能会因量子比特之间的杂散相互作用和无序等因素而出现错误。 在此，我们利用量子比特之间的相互作用和无序来改进半导体门定义量子点自旋中的自旋本征态交换操作。 我们使用一个由四个电子自旋组成的系统，将其配置为两个交换耦合的单态-三重态量子比特。 我们的方法依赖于离散时间晶体背后的物理原理，使自旋本征态交换的质量因子提高了数量级。 我们的结果表明，多量子比特系统中的相互作用和无序可以稳定非平凡的量子操作，并暗示了非平衡量子现象（如时间晶体）在量子信息处理应用中的潜在用途。 我们的结果还证实了长期以来预测的交换耦合单态-三重态量子比特之间有效伊辛相互作用的出现。 显示英文摘要

摘要： The transfer of information between quantum systems is essential for quantum communication and computation. In quantum computers, high connectivity between qubits can improve the efficiency of algorithms, assist in error correction, and enable high-fidelity readout. However, as with all quantum gates, operations to transfer information between qubits can suffer from errors associated with spurious interactions and disorder between qubits, among other things. Here, we harness interactions and disorder between qubits to improve a swap operation for spin eigenstates in semiconductor gate-defined quantum-dot spins. We use a system of four electron spins, which we configure as two exchange-coupled singlet-triplet qubits. Our approach, which relies on the physics underlying discrete time crystals, enhances the quality factor of spin-eigenstate swaps by up to an order of magnitude. Our results show how interactions and disorder in multi-qubit systems can stabilize non-trivial quantum operations and suggest potential uses for non-equilibrium quantum phenomena, like time crystals, in quantum information processing applications. Our results also confirm the long-predicted emergence of effective Ising interactions between exchange-coupled singlet-triplet qubits.