Thermality versus objectivity: can they peacefully coexist?

Abstract

Under the influence of external environments, quantum systems can undergo various different processes, including decoherence and equilibration. We observe that macroscopic objects are both objective and thermal, thus leading to the expectation that both objectivity and thermalisation can peacefully coexist on the quantum regime too. Crucially, however, objectivity relies on distributed classical information that could conflict with thermalisation. Here, we examine the overlap between thermal and objective states. We find that in general, one cannot exist when the other is present. However, there are certain regimes where thermality and objectivity are more likely to coexist: in the high temperature limit, at the non-degenerate low temperature limit, and when the environment is large. This is consistent with our experiences that everyday-sized objects can be both thermal and objective.

arXiv commentPublished version: 17 + 3 pages, 4 figures, 1 table

References in corpus (54)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Decoherence, einselection, and the quantum origins of the classical
• Phantom Energy and Cosmic Doomsday
• An Open-System Quantum Simulator with Trapped Ions
• The foundations of statistical mechanics from entanglement: Individual states vs. averages
• Equilibration, thermalisation, and the emergence of statistical mechanics in closed quantum systems
• The role of quantum information in thermodynamics --- a topical review
• Open Quantum Systems. An Introduction
• Quantum mechanical evolution towards thermal equilibrium
• Quantum Darwinism
• Almost all quantum states have non-classical correlations
• Quantum Decoherence
• Quantum-state preparation with universal gate decompositions
• A Dying Universe: The Long Term Fate and Evolution of Astrophysical Objects
• Extractable Work from Correlations
• Quantum equilibration in finite time
• Objective properties from subjective quantum states: Environment as a witness
• Stabilizing Open Quantum Systems by Markovian Reservoir Engineering
• Thermalization in Nature and on a Quantum Computer
• A divide-and-conquer algorithm for quantum state preparation
• Is There Really a de Sitter/CFT Duality
• Generic emergence of classical features in quantum Darwinism
• Quantum origins of objectivity
• Thermodynamic cost of creating correlations
• Quantum Darwinism in a hazy environment
• Convergence to equilibrium under a random Hamiltonian
• The Rise and Fall of Redundancy in Decoherence and Quantum Darwinism
• Quantum Darwinism in non-ideal environments
• Strong Quantum Darwinism and Strong Independence is equivalent to Spectrum Broadcast Structure
• Eavesdropping on the Decohering Environment: Quantum Darwinism, Amplification, and the Origin of Objective Classical Reality
• Application of quantum Darwinism to a structured environment
• Thermalization under randomized local Hamiltonians
• Non-Markovianity hinders Quantum Darwinism
• The role of information back-flow in the emergence of quantum Darwinism
• Monitoring of the process of system information broadcasting in time
• Generic emergence of objectivity of observables in infinite dimensions
• Decoherence without entanglement and Quantum Darwinism
• Quantum Darwinism and non-Markovian dissipative dynamics from quantum phases of the spin-1/2 XX model
• Generic appearance of objective results in quantum measurements
• Dynamical Objectivity in Quantum Brownian Motion
• Objectivity (or lack there of): a comparison between predictions of quantum Darwinism and spectrum broadcast structure
• Quantum Darwinism in a structured spin environment
• Entanglement and objectivity in pure dephasing models
• Quantum Darwinism in a composite system: Objectivity versus classicality
• (Anti-)Zeno-based dynamical control of the unfolding of quantum Darwinism
• Correlation density matrix: an unbiased analysis of exact diagonalizations
• Witnessing non-objectivity in the framework of strong quantum Darwinism
• System information propagation for spin structures
• Dissipation, dephasing and quantum Darwinism in qubit systems with random unitary interactions
• Decoherence of spin registers revisited
• Dependence of a quantum mechanical system on its own initial state and the initial state of the environment it interacts with
• Refined diamond norm bounds on the emergence of objectivity of observables
• A glimpse of objectivity in bipartite systems for non-entangling pure dephasing evolutions
• Witnessing Objectivity on a Quantum Computer