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Coherence-based characterization of macroscopic quantumness

Naseri, M ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevA.103.032209
  3. Publisher: American Physical Society , 2021
  4. Abstract:
  5. One of the most elusive problems in quantum mechanics is the transition between classical and quantum physics. This problem can be traced back to Schrödinger's cat thought experiment. A key element that lies at the center of this problem is the lack of a clear understanding and characterization of macroscopic quantum states. Our understanding of macroscopic quantumness relies on states such as the Greenberger-Horne-Zeilinger (GHZ) or the NOON state. Here we take a first-principle approach to this problem. We start from coherence as the key quantity that captures the notion of quantumness and require the quantumness to be collective and macroscopic. To this end, we introduce macroscopic coherence which is the coherence between macroscopically distinct quantum states. We construct a measure that quantifies how global and collective the coherence of the state is. Our work also provides a first-principle way to derive well-established states like the GHZ and the NOON state as the states that maximize our measure. Our approach paves the way towards a better understanding of the quantum-to-classical transition. © 2021 American Physical Society
  6. Keywords:
  7. First principles ; First-principle approach ; Greenberger-Horne-Zeilinger ; Macroscopic quantum state ; Quantum physics ; Quantum state ; Quantum to classical transition ; Thought experiments ; Quantum entanglement
  8. Source: Physical Review A ; Volume 103, Issue 3 , 2021 ; 24699926 (ISSN)
  9. URL: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.103.032209