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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…
Information heat engine: converting information to energy by feedback control
Shoichi Toyabe, Takahiro Sagawa, Masahito Ueda +2
In 1929, Leo Szilard invented a feedback protocol in which a hypothetical intelligence called Maxwell's demon pumps heat from an isothermal environment and transduces it to work. A…
Quantum Szilard Engine
Sang Wook Kim, Takahiro Sagawa, Simone De Liberato +1
The Szilard engine (SZE) is the quintessence of Maxwell's demon, which can extract the work from a heat bath by utilizing information. We present the first complete quantum analysi…