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Title: Revealing the Emergence of Classicality Using Nitrogen-Vacancy Centers

Journal Article · · Physical Review Letters
 [1];  [2];  [3]; ORCiD logo [4];  [5]
  1. Ulm Univ., Ulm (Germany). Inst. for Quantum Optics
  2. Ulm Univ., Ulm (Germany). Inst. for Quantum Optics; Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Physical Measurement Lab.
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Ulm Univ., Ulm (Germany). Inst. for Quantum Optics and Center for Integrated Quantum Science and Technology (IQst)

The origin of classical reality in our quantum world is a long-standing mystery. Here, we examine a nitrogen-vacancy center in diamond evolving in the presence of its magnetic nuclear spin environment which is formed by the natural appearance of carbon 13C atoms in the diamond lattice, to study quantum Darwinism—the proliferation of information about preferred quantum states throughout the world via the environment. This redundantly imprinted information accounts for the perception of objective reality, as it is independently accessible by many without perturbing the system of interest. To observe this process, we implement a novel dynamical decoupling scheme that enables the measurement and control of several nuclear spins (the environment $$\mathcal{E}$$) interacting with a nitrogen vacancy (the system $$\mathcal{S}$$). Our experiment demonstrates that, in the course of the decoherence of $$\mathcal{S}$$, redundant information is indeed imprinted onto $$\mathcal{E}$$, giving rise to incipient classical objectivity—a consensus recorded in redundant copies, and available from the fragments of the nuclear spin environment E, about the state of $$\mathcal{S}$$. This provides the first laboratory verification of the process responsible for the emergence of the objective classical world from the underlying quantum substrate.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1764949
Report Number(s):
LA-UR-18-27412; TRN: US2206448
Journal Information:
Physical Review Letters, Vol. 123, Issue 14; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Quantum Darwinism and non-Markovianity in a model of quantum harmonic oscillators journal November 2019
Quantum Darwinism in a structured spin environment journal November 2021
Appearance of objectivity for NV centers interacting with dynamically polarized nuclear environment journal April 2021
Quantum Darwinism and the spreading of classical information in non-classical theories journal January 2022
Decoherence and information encoding in quantum reference frames preprint January 2020

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