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首页> 外文期刊>Physical review, B >Coupling two spin qubits with a high-impedance resonator
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Coupling two spin qubits with a high-impedance resonator

机译：耦合两个旋转Qubits，具有高阻抗谐振器

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摘要

Fast, high-fidelity single and two-qubit gates are essential to building a viable quantum information processor, but achieving both in the same system has proved challenging for spin qubits. We propose and analyze an approach to perform a long-distance two-qubit controlled phase (CPHASE) gate between two singlet-triplet qubits using an electromagnetic resonator to mediate their interaction. The qubits couple longitudinally to the resonator, and by driving the qubits near the resonator's frequency, they can be made to acquire a state-dependent geometric phase that leads to a CPHASE gate independent of the initial state of the resonator. Using high impedance resonators enables gate times of order 10 ns while maintaining long coherence times. Simulations show average gate fidelities of over 96% using currently achievable experimental parameters and over 99% using state-of-the-art resonator technology. After optimizing the gate fidelity in terms of parameters tuneable in situ, we find it takes a simple power-law form in terms of the resonator's impedance and quality and the qubits' noise bath.
机译：快速，高保真单和两个Qubit门对于构建可行量子信息处理器至关重要，但在同一系统中实现既有具有挑战性的旋转Qubits。我们提出并分析了使用电磁谐振器在两个单线三态Qubits之间执行长距离双Qubbit控制相（CPhase）栅极的方法，以介导它们的相互作用。 Qubits纵向地耦合到谐振器，并且通过驱动谐振器频率附近的Qubits，它们可以被做出以获取与谐振器的初始状态无关的Cphase门的状​​态相关的几何相位。使用高阻抗谐振器使得能够在保持长相干时间的同时实现订单10ns的门。使用现有的实验参数和使用最先进的谐振器技术，模拟显示平均栅极保真度超过96％的栅极保真度超过99％。在以原位的参数优化栅极保真度之后，我们发现它在谐振器的阻抗和质量和Qubits的噪音浴方面采取简单的幂律形式。

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