Zobrazeno 1 - 10
of 54
pro vyhledávání: '"Shirai, Tatsuhiko"'
Combinatorial optimization has wide applications from industry to natural science. Ising machines bring an emerging computing paradigm for efficiently solving a combinatorial optimization problem by searching a ground state of a given Ising model. Cu
Externí odkaz:
http://arxiv.org/abs/2403.19175
Autor:
Shirai, Tatsuhiko, Togawa, Nozomu
Publikováno v:
IEEE Transactions on Quantum Engineering, 5, 3101114 (2024)
We propose a post-processing variationally scheduled quantum algorithm (pVSQA) for solving constrained combinatorial optimization problems (COPs). COPs are typically transformed into ground-state search problems of the Ising model on a quantum anneal
Externí odkaz:
http://arxiv.org/abs/2309.08120
Autor:
Shirai, Tatsuhiko, Mori, Takashi
Publikováno v:
Phys. Rev. Lett. 133, 040201 (2024)
Markovian open many-body quantum systems display complicated relaxation dynamics. The spectral gap of the Liouvillian characterizes the asymptotic decay rate towards the stationary state, but it has recently been pointed out that the spectral gap doe
Externí odkaz:
http://arxiv.org/abs/2309.03485
Autor:
Mori, Takashi, Shirai, Tatsuhiko
Markovian open quantum systems display complicated relaxation dynamics. The spectral gap of the Liouvillian characterizes the asymptotic decay rate towards the steady state, but it does not necessarily give a correct estimate of the relaxation time b
Externí odkaz:
http://arxiv.org/abs/2212.06317
Publikováno v:
Phys. Rev. E 103, 040102 (2021)
We investigate the relaxation dynamics of open non-integrable quantum many-body systems in the thermodynamic limit by using a tensor-network formalism. We simulate the Lindblad quantum master equation (LQME) of infinite systems by making use of the u
Externí odkaz:
http://arxiv.org/abs/2012.12274
Publikováno v:
IEEE Access, vol. 8, pp. 210490-210502, 2020
We propose a novel type of minor-embedding (ME) in simulated-annealing-based Ising machines. The Ising machines can solve combinatorial optimization problems. Many combinatorial optimization problems are mapped to find the ground (lowest-energy) stat
Externí odkaz:
http://arxiv.org/abs/2012.02372
Autor:
Shirai, Tatsuhiko, Tanaka, Shu
This study investigates the dynamical critical exponent of disordered Ising chains under transverse fields to examine the effect of a correlated disorder on quantum phase transitions. The correlated disorder, where the on-site transverse field depend
Externí odkaz:
http://arxiv.org/abs/2007.07439
Autor:
Mori, Takashi, Shirai, Tatsuhiko
Publikováno v:
Phys. Rev. Lett. 125, 230604 (2020)
The gap of the Liouvillian spectrum gives the asymptotic decay rate of a quantum dissipative system, and therefore its inverse has been identified as the slowest relaxation time. In contrary to this common belief, we show that the relaxation time due
Externí odkaz:
http://arxiv.org/abs/2006.10953
Publikováno v:
Phys. Rev. A 101, 013809 (2020)
We study a dynamical phase transition in optical bistable systems subject to a time-periodic driving field. The phase transition occurs in the structure of limit cycle as a function of the frequency of the driving field. In the thermodynamic limit, a
Externí odkaz:
http://arxiv.org/abs/1910.10618
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