Quantum annealing with spin lock technique

Matsuzaki, Yuichiro; Seki, Yoji; Kawabata, S.

doi:10.7567/ssdm.2019.e-1-05

Cited by 1 publication

(1 citation statement)

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“…Since the qubit frequency (an order of GHz) is just a few orders of magnitude larger than the other typical frequencies (an order of MHz), 31) a careful assessment of the error accumulation due to the violation of the RWA is necessary to evaluate the practicality of the spinlock based QA with the CSFQs. It is worth mentioning that, in our previous study at the SSDM, 33) we implement a numerical simulation along this direction with a fixed number of the qubits. On the other hand, we investigate how the performance of the QA with spin-lock changes when we increase the number of the qubits, and discuss how our scheme scales in this paper.…”

Section: Introductionmentioning

confidence: 99%

Quantum annealing with capacitive-shunted flux qubits

Matsuzaki

Hakoshima

Seki

et al. 2020

Jpn. J. Appl. Phys.

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Quantum annealing (QA) provides us with a way to solve combinatorial optimization problems. In the previous demonstration of the QA, a superconducting flux qubit (FQ) was used. However, the flux qubits in these demonstrations have a short coherence time such as tens of nano seconds. For the purpose to utilize quantum properties, it is necessary to use another qubit with a better coherence time. Here, we propose to use a capacitive-shunted flux qubit (CSFQ) for the implementation of the QA. The CSFQ has a few order of magnitude better coherence time than the FQ used in the QA. We theoretically show that, although it is difficult to perform the conventional QA with the CSFQ due to the form and strength of the interaction between the CSFQs, a spin-lock based QA can be implemented with the CSFQ even with the current technology. Our results pave the way for the realization of the practical QA that exploits quantum advantage with long-lived qubits. * matsuzaki.yuichiro@aist.go.jp † hakoshima-hideaki@aist.go.jp arXiv:2001.09844v2 [quant-ph]

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Section: Introductionmentioning

confidence: 99%