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Optimal Quantum State Estimation by No-Signaling Principle
No-Signaling Principle Quantum Physics
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2010/11/8
We obtain a simple derivation of the optimal quantum state estimation of a two-level system using the no-signaling principle. In particular, we show that the no-signaling principle determines the uni...
Uncertainty Relation Revisited from Quantum Estimation Theory
Uncertainty Relation Revisited Quantum Estimation Theory
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2010/11/5
By invoking quantum estimation theory we formulate the uncertainty relation for arbitrary quantum states and measurements in a finite-dimensional Hilbert space. To obtain information about the quantum...
On quantum estimation, quantum cloning and finite quantum de Finetti theorems
On quantum estimation quantum cloning finite quantum de Finetti theorems
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2010/11/4
This paper presents a series of results on the interplay between quantum estimation, cloning and finite de Finetti theorems. First, we consider the measure-and-prepare channel that uses optimal estim...
Bayesian estimation in homodyne interferometry
Bayesian estimation homodyne interferometry
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2010/4/8
We address phase-shift estimation by means of squeezed vacuum probe and homodyne detection. We analyze Bayesian estimator, which is known to asymptotically saturate the classical Cramer-Rao bound to t...