A levitated ferromagnet enables generation of macroscopic spin GHZ states with achievable Heisenberg scaling in quantum Fisher information under accessible experimental conditions.
How often is the coordinate of a harmonic oscillator positive?
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abstract
The coordinate of a harmonic oscillator is measured at a time chosen at random among three equiprobable instants: now, after one third of the period, or after two thirds. The (total) probability that the outcome is positive depends on the state of the oscillator. In the classical case the probability varies between 1/3 and 2/3, but in the quantum case -- between 0.29 and 0.71.
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UNVERDICTED 3representative citing papers
Quantum-mechanical analysis of the Tsirelson inequality in harmonic oscillators shows that generalized uniform precession conditions hold sufficiently well to imply the presence of quantum interference terms.
The paper introduces the generalised probabilistic theories framework as a convex operational setting that represents states, transformations, and measurements and encompasses classical and quantum theories along with Bell non-locality and box world.
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Macroscopic Spin GHZ States with a Levitated Ferromagnet
A levitated ferromagnet enables generation of macroscopic spin GHZ states with achievable Heisenberg scaling in quantum Fisher information under accessible experimental conditions.
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Generalised Probabilistic Theories
The paper introduces the generalised probabilistic theories framework as a convex operational setting that represents states, transformations, and measurements and encompasses classical and quantum theories along with Bell non-locality and box world.