论文标题
连贯保护的非绝热几何量子计算
Coherence-protected nonadiabatic geometric quantum computation
论文作者
论文摘要
由于使用几何阶段，非绝热几何门具有抵抗控制误差的稳健性。另一方面，反校准仍然会影响非绝热的几何门，这是降低其保真度的关键因素。在本文中，我们表明，基于实现非绝热几何门的哈密顿量系统，可以通过使用不仅保留了非绝热几何栅极的几何特征来构建新的哈密顿量，而且还保留了系统的连贯性。结果，通过新系统的哈密顿量实现了一个连贯保护的非绝热几何门，并且该门具有针对控制误差和谐波的鲁棒性。我们将进一步实施我们的方案，并表明可以实现一套通用的受糖保护的非绝热几何门。我们的方案不需要辅助系统或用物理Qubt的逻辑Qubits编码，这可以为实施节省资源。由于对控制误差和逆转性的鲁棒性，我们的方案提供了一种实现高保真量子门的有希望的方法。
Because of using geometric phases, nonadiabatic geometric gates have the robustness against control errors. On the other hand, decoherence still affects nonadiabatic geometric gates, which is a key factor in reducing their fidelities. In this paper, we show that based on the system Hamiltonian that realizes a nonadiabatic geometric gate, one may construct a new system Hamiltonian, by using which not only the geometric feature of the nonadiabatic geometric gate is preserved, but also the system's coherence is protected. As a result, a coherence-protected nonadiabatic geometric gate is realized with the new system Hamiltonian and this gate has the robustness against both control errors and decoherence. We further implement our scheme with nitrogen-vacancy centers and show that a universal set of coherence-protected nonadiabatic geometric gates can be realized. Our scheme does not need auxiliary systems or the encoding of logical qubits with physical qubits, which saves resources for the implementation. Due to the robustness against both control errors and decoherence, our scheme provides a promising way to realize high-fidelity quantum gates.
