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Fast non-Abelian geometric gates via transitionless quantum driving

机译:通过无过渡量子驱动实现快速的非阿贝尔几何门

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摘要

A practical quantum computer must be capable of performing high fidelity quantum gates on a set of quantum bits (qubits). In the presence of noise, the realization of such gates poses daunting challenges. Geometric phases, which possess intrinsic noise-tolerant features, hold the promise for performing robust quantum computation. In particular, quantum holonomies, i.e., non-Abelian geometric phases, naturally lead to universal quantum computation due to their non-commutativity. Although quantum gates based on adiabatic holonomies have already been proposed, the slow evolution eventually compromises qubit coherence and computational power. Here, we propose a general approach to speed up an implementation of adiabatic holonomic gates by using transitionless driving techniques and show how such a universal set of fast geometric quantum gates in a superconducting circuit architecture can be obtained in an all-geometric approach. Compared with standard non-adiabatic holonomic quantum computation, the holonomies obtained in our approach tends asymptotically to those of the adiabatic approach in the long run-time limit and thus might open up a new horizon for realizing a practical quantum computer.
机译:实用的量子计算机必须能够对一组量子位(qubit)执行高保真量子门。在存在噪声的情况下,这种门的实现提出了艰巨的挑战。具有固有的噪声容忍特征的几何相位,有望实现强大的量子计算。尤其是,量子完整论,即非阿贝尔几何相位,由于其不可交换性,自然会导致通用量子计算。尽管已经提出了基于绝热完整论的量子门,但缓慢的发展最终会损害量子比特的相干性和计算能力。在这里,我们提出了一种通用方法,通过使用无过渡驱动技术来加快绝热完整门的实现,并展示了如何以全几何方法获得超导电路体系结构中这样一套通用的快速几何量子门。与标准的非绝热完整量子计算相比,在较长的运行时间范围内,我们的方法所获得的完全渐近性趋于绝热方法,因此可能为实现实用的量子计算机开辟新的视野。

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