Quantum criticality at infinite temperature

Abstract

Quantum criticality, being important as an indicator of new quantum matters emerging, is known to occur only at zero or low temperature. We find that a quantum probe, if its coherence time is long, can detect quantum criticality at infinitely high temperature. In particular, the echo control over a spin probe can remove the thermal fluctuation effects and hence reveals the quantum fluctuation effects. Probes with quantum coherence time of milliseconds or seconds can be used to study emerging quantum orders that would occur at extremely low temperatures of nano- or pico-Kelvin. This discovery establishes a physical link between time and inverse temperature and provides a new route to the wonderland of quantum matters.

4 pages 4 figures

References in corpus (14)

• Many-Body Physics with Ultracold Gases
• Ultracold atomic gases in optical lattices: mimicking condensed matter physics and beyond
• Dynamical decoupling and noise spectroscopy with a superconducting flux qubit
• Universal dynamical decoupling of a single solid-state spin from a spin bath
• A robust, scanning quantum system for nanoscale sensing and imaging
• How to Enhance Dephasing Time in Superconducting Qubits
• Extending Quantum Coherence in Diamond
• Decoherence induced by interacting quantum spin baths
• Nuclear spin pair coherence in diamond for atomic scale magnetometry
• Coherence Time of a Solid-State Nuclear Qubit
• Detection of quantum critical points by a probe qubit
• Anomalous decoherence effect in a quantum bath
• Intrinsic Heating and Cooling in Adiabatic Processes for Bosons in Optical Lattices
• Bang-Bang control of a qubit coupled to a quantum critical spin bath

Cited by in corpus (10)

• Phase transitions in the complex plane of physical parameters
• Uncovering many-body correlations in nanoscale nuclear spin baths by central spin decoherence
• Contact matrix in dilute quantum systems
• Faraday rotation echo spectroscopy and detection of quantum fluctuations
• Pulsed Quantum-State Reconstruction of Dark Systems
• Effects of local decoherence on quantum critical metrology
• Spin-echo and quantum versus classical critical fluctuations in TmVO${}_4$
• Quantum Criticality in the infinite-range Transverse Field Ising Model
• Fluctuation Relations for Heat Exchange in the Generalized Gibbs Ensemble
• Nuclear magnetic resonance studies in a model transverse field Ising system