Classicalization of Quantum State of Detector by Amplification Process
arXiv:1704.04630 · doi:10.1016/j.physleta.2019.02.039
Abstract
It has been shown that a macroscopic system being in a high-temperature thermal coherent state can be, in principle, driven into a non-classical state by coupling to a microscopic system. Therefore, thermal coherent states do not truly represent the classical limit of quantum description. Here, we study the classical limit of quantum state of a more relevant macroscopic system, namely the pointer of a detector, after the phase-preserving linear amplification process. In particular, we examine to what extent it is possible to find the corresponding amplified state in a superposition state, by coupling the pointer to a qubit system. We demonstrate quantitatively that the amplification process is able to produce the classical limit of quantum state of the pointer, offering a route for a classical state in a sense of not to be projected into a quantum superposition state.
arXiv comment7 pages, 7 figures
References in corpus (18)
- Decoherence, einselection, and the quantum origins of the classical
- Introduction to Quantum Noise, Measurement and Amplification
- Quantum key distribution using gaussian-modulated coherent states
- Decoherence, the measurement problem, and interpretations of quantum mechanics
- Dynamical Reduction Models
- Classical world arising out of quantum physics under the restriction of coarse-grained measurements
- Quantification of Macroscopic Quantum Superpositions within Phase Space
- Quantum limits on phase-preserving linear amplifiers
- Probing macroscopic realism via Ramsey correlations measurements
- Transfer of Nonclassical Properties from A Microscopic Superposition to Macroscopic Thermal States in The High Temperature Limit
- Nonclassical Properties of Coherent States
- Quantum superpositions and entanglement of thermal states at high temperatures and their applications to quantum information processing
- Nonclassicality of Thermal Radiation
- Macroscopic superposition and entanglement for displaced thermal fields induced by a single atom
- Decoherence of Highly Mixed Macroscopic Quantum Superpositions
- Effective description of the short-time dynamics in open quantum systems
- Atom Lasers, Coherent States, and Coherence:II. Maximally Robust Ensembles of Pure States
- Assisted Macroscopic Quantumness