Degree of Fuzziness in Coarsened Measurement References

TL;DR

This paper investigates how the degree of fuzziness in measurement references, originating from Hamiltonian or timing uncertainties, affects the quantum-to-classical transition, revealing different behaviors based on the source of fuzziness.

Contribution

It introduces a general framework analyzing how varying degrees of reference fuzziness influence quantum effects, considering both Hamiltonian and timing sources.

Findings

Fuzziness from Hamiltonian varies with rotation angle, yet quantum effects persist.

Fuzziness from timing remains unchanged with rotation angle.

Environmental decoherence can facilitate quantum effects during measurement axis rotation.

Abstract

It has been found that the quantum-to-classical transition can be observed independent of macroscopicity of the quantum state for a fixed degree of fuzziness in the coarsened references of measurements. Here, a general situation, that is the degree of fuzziness can change with the rotation angle between two states (different rotation angles represent different references), is researched based on the reason that the fuzziness of reference can come from two kinds: the Hamiltonian (rotation frequency) and the timing (rotation time). Our results show that, for the fuzziness of Hamiltonian alone, the degree of fuzziness for reference will change with the rotation angle between two states and the quantum effects can still be observed no matter how much degree of fuzziness of Hamiltonian; for the fuzziness of timing, the degree of coarsening reference is unchanged with the rotation angle. Moreover, during the rotation of the measurement axis, the decoherence environment can also help the classical-to-quantum transition due to changing the direction of measurement axis.