Optical coherence: A convenient fiction
Abstract
We conjecture that optical coherences, i.e., quantum-mechanical coherences between states separated by Bohr frequencies in the optical regime, do not exist in optics experiments. We claim the exact vanishing of optical field amplitudes and atomic dipole expectation values, and we discuss the seemingly contradictory success of assigning finite values to such quantities in theoretical calculations. We show that our conjecture is not at variance with the observed interference between different light sources. The connection to the concept of spontaneous symmetry breaking and the identification of entangled states as pointer basis states is discussed.
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If all phase reference beams are taken into account, quantum states of light can be regarded as incoherent mixtures of states occupying different total photon number sectors.
“If all phase reference beams are taken into account, we can regard quantum states of light as incoherent mixtures of states occupying different total photon number sectors5354.”
From The elusive Heisenberg limit in quantum-enhanced metrology (2012) · cites this paper as [54]
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Stammer, P. (2024) · Physical Review Research · doi:10.1103/physrevresearch.6.l032033 · Cited by 18 · see citing works
Single particle nonlocality with completely independent reference states
Cooper, J. J., & Dunningham, J. A. (2008) · New Journal of Physics · doi:10.1088/1367-2630/10/11/113024 · Cited by 18 · see citing works
Defending Continuous Variable Teleportation: Why a laser is a clock, not a quantum channel
Wiseman, H. M. (2004) · CERN Document Server (European Organization for Nuclear Research) · Cited by 18 · see citing works
Operational formulation of homodyne detection
Tyc, T., & Sanders, B. C. (2004) · CERN Document Server (European Organization for Nuclear Research) · Cited by 18 · see citing works
Pegg, D. T., & Jeffers, J. (2005) · Journal of Modern Optics · doi:10.1080/09500340500106857 · Cited by 17 · see citing works
Decoherence of a two-state atom driven by coherent light
Nha, H., & Carmichael, H. J. (2005) · Physical Review A · doi:10.1103/physreva.71.013805 · Cited by 17 · see citing works
Reconstruction of the Joint State of a Two-Mode Bose-Einstein Condensate
Bolda, E. L., Tan, S. M., & Walls, D. F. (1997) · Physical Review Letters · doi:10.1103/physrevlett.79.4719 · Cited by 16 · see citing works
- Authors
- Mølmer, K.
- Affiliations
- Aarhus University (DK)
- Corresponding author
- Mølmer, Klaus
- ORCID
- Mølmer, Klaus
- Venue
- Physical Review A
- Publisher
- American Physical Society (APS)
- Published
- 1997-04-01
- Volume
- 55
- Issue
- 4
- Pages
- 3195-3203
- ISSN
- 0556-2791 (ISSN-L)
- 1050-2947
- 1094-1622
- OpenAlex
- W1996923927
- Cited by
- 223
- References
- 24
- Citations by year
- 2026: 4 · 2025: 4 · 2024: 5 · 2023: 9 · 2022: 4 · 2021: 4 · 2020: 3 · 2019: 3 · 2018: 4 · 2017: 28 · 2016: 4 · 2015: 6 · 2014: 11 · 2013: 6 · 2012: 9
- FWCI
- 6.75
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Physical Review A (publishedVersion)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum optics and atomic interactions
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Keywords
- optical coherence, quantum coherence, atomic dipole moments, field amplitude, spontaneous symmetry breaking, entangled states, quantum measurement
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