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arXiv 2102.01682quant-ph
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利用超导量子比特的量子算法中的动态量子线路

Exploiting dynamic quantum circuits in a quantum algorithm with superconducting qubits

Antonio D. Corcoles, Maika Takita, Ken Inoue, Scott Lekuch, Zlatko K. Minev, Jerry M. Chow, Jay M. Gambetta

摘要:

量子线路在真实系统上的执行在很大程度上被限制在那些简单的时间有序序列的幺正操作之后的投影测量。随着量子计算的硬件平台在规模和能力上不断成熟,使量子线路超越其传统结构势在必行。在这里,我们进入了基于超导的量子系统上的动态量子线路的领域。动态量子线路不仅涉及整个计算过程中量子态的演化,而且还涉及在比电路的执行时间更短的时间尺度内周期性地测量电路中间的量子比特子集以及对所产生的经典信息的并发处理。使用嘈杂的量子硬件,我们探索最基本的量子算法之一,量子相位估计,在其自适应版本,利用动态电路,并比较结果的非自适应实现相同的算法。我们证明,当系统中的噪声和延迟足够低时,具有动态电路的实时量子计算版本可以提供实质性和有形的优势,为真实量子系统上的可用算法的新领域打开了大门。

英文摘要:

The execution of quantum circuits on real systems has largely been limited to those which are simply time-ordered sequences of unitary operations followed by a projective measurement. As hardware platforms for quantum computing continue to mature in size and capability, it is imperative to enable quantum circuits beyond their conventional construction. Here we break into the realm of dynamic quantum circuits on a superconducting-based quantum system. Dynamic quantum circuits involve not only the evolution of the quantum state throughout the computation, but also periodic measurements of a subset of qubits mid-circuit and concurrent processing of the resulting classical information within timescales shorter than the execution times of the circuits. Using noisy quantum hardware, we explore one of the most fundamental quantum algorithms, quantum phase estimation, in its adaptive version, which exploits dynamic circuits, and compare the results to a non-adaptive implementation of the same algorithm. We demonstrate that the version of real-time quantum computing with dynamic circuits can offer a substantial and tangible advantage when noise and latency are sufficiently low in the system, opening the door to a new realm of available algorithms on real quantum systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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