112 citations · 514 across the 8 of their papers we have counts for
8 papers
Integral Quantum Fluctuation Theorems under Measurement and Feedback control
Ken Funo, Yu Watanabe, Masahito Ueda
We derive integral quantum fluctuation theorems and quantum Jarzynski equalities for a feedback-controlled system and a memory which registers outcomes of the measurement. The obta…
Simultaneous continuous measurement of photon-counting and homodyne detection on a free photon field: dynamics of state reduction and mutual influence of measurement backaction
Yui Kuramochi, Yu Watanabe, Masahito Ueda
We analyze a simultaneous continuous measurement of photon-counting and homodyne detection. The stochastic master equation or stochastic Schrödinger equation describing the measure…
Thermodynamic Work Gain from Entanglement
Ken Funo, Yu Watanabe, Masahito Ueda
We show that entanglement can be utilized to extract thermodynamic work beyond classical correlation via feedback control based on measurement on part of a composite system. The ne…
Finite-Size Scaling Analysis of the Eigenstate Thermalization Hypothesis in a One-Dimensional Interacting Bose gas
Tatsuhiko N. Ikeda, Yu Watanabe, Masahito Ueda
By calculating correlation functions for the Lieb-Liniger model based on the algebraic Bethe ansatz method, we conduct a finite-size scaling analysis of the eigenstate thermalizati…
Quantum Estimation Theory of Error and Disturbance in Quantum Measurement
Yu Watanabe, Masahito Ueda
We formulate the error and disturbance in quantum measurement by invoking quantum estimation theory. The disturbance formulated here characterizes the non-unitary state change caus…
Eigenstate Randomization Hypothesis: Why Does the Long-Time Average Equal the Microcanonical Average?
Tatsuhiko N. Ikeda, Yu Watanabe, Masahito Ueda
We derive an upper bound on the difference between the long-time average and the microcanonical ensemble average of observables in isolated quantum systems. We propose, numerically…
Uncertainty Relation Revisited from Quantum Estimation Theory
Yu Watanabe, Takahiro Sagawa, Masahito Ueda
By invoking quantum estimation theory we formulate bounds of errors in quantum measurement for arbitrary quantum states and observables in a finite-dimensional Hilbert space. We pr…
Optimal Measurement on Noisy Quantum Systems
Yu Watanabe, Takahiro Sagawa, Masahito Ueda
We identify the optimal measurement for obtaining information about the original quantum state after the state to be measured has undergone partial decoherence due to noise. We qua…