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quant-ph2007★ 10 cited
Upper bound on our knowledge about noncommuting observables for a qubit system
Yuji Kurotani, Takahiro Sagawa, Masahito Ueda
A trade-off relation on our knowledge about two noncommuting observables of a qubit system in simultaneous measurement is formulated. The obtained inequality offers a quantitative…
quant-ph2006★ 1 cited
Circuit analysis of quantum measurement
Yuji Kurotani, Masahito Ueda
We develop a circuit theory that enables us to analyze quantum measurements on a two-level system and on a continuous-variable system on an equal footing. As a measurement scheme a…