30 citations · 93 across the 9 of their papers we have counts for
9 papers
A comprehensive survey on quantum computer usage: How many qubits are employed for what purposes?
Tsubasa Ichikawa, Hideaki Hakoshima, Koji Inui +18
Quantum computers (QCs), which work based on the law of quantum mechanics, are expected to be faster than classical computers in several computational tasks such as prime factoring…
Latency-aware adaptive shot allocation for run-time efficient variational quantum algorithms
Kosuke Ito
Efficient classical optimizers are crucial in practical implementations of Variational Quantum Algorithms (VQAs). In particular, to make Stochastic Gradient Descent (SGD) resource…
Universal noise-precision relations in variational quantum algorithms
Kosuke Ito, Wataru Mizukami, Keisuke Fujii
Variational quantum algorithms (VQAs) are expected to become a practical application of near-term noisy quantum computers. Although the effect of the noise crucially determines whe…
Collectively enhanced high-power and high-capacity charging of quantum batteries via quantum heat engines
Kosuke Ito, Gentaro Watanabe
As a model of so-called quantum battery (QB), quantum degrees of freedom as energy storage, we study a charging protocol of a many-body QB consisting of two-level systems (TLSs…
Universal relations and bounds for fluctuations in quasistatic small heat engines
Kosuke Ito, Guo-Hua Xu, Chao Jiang +4
The efficiency of any heat engine, defined as the ratio of average work output to heat input, is bounded by Carnot's celebrated result. However, this measure is insufficient to cha…
Generalized energy measurements and quantum work compatible with fluctuation theorems
Kosuke Ito, Peter Talkner, B. Prasanna Venkatesh +1
The probability densities of work that can be exerted on a quantum system initially staying in thermal equilibrium are constrained by the fluctuation relations of Jarzynski and Cro…
Fundamental bound on the power of quantum machines
Kosuke Ito, Takayuki Miyadera
Giving a universal upper bound on the power output of heat engines is a long-standing open problem. We tackle this problem for generic quantum machines in self-contained formulatio…
Optimal performance of generalized heat engines with finite-size baths of arbitrary multiple conserved quantities beyond i.i.d. scaling
Kosuke Ito, Masahito Hayashi
In quantum thermodynamics, effects of finiteness of the baths have been less considered. In particular, there is no general theory which focuses on finiteness of the baths of multi…
Asymptotic Compatibility between LOCC Conversion and Recovery
Kosuke Ito, Wataru Kumagai, Masahito Hayashi
Recently, entanglement concentration was explicitly shown to be irreversible. However, it is still not clear what kind of states can be reversibly converted in the asymptotic setti…