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arXiv:1401.3218 · The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting

Ground state quantum coherences, from quantum beats to strong control

Andres D. Cimmarusti, Burkley D. Patterson, Wanderson M. Pimenta, Luis A. Orozco, Pablo Barberis-Blostein, H. J. Carmichael

Published Jan 1, 2013• 0 citations
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Abstract

Second order correlations reveal quantum beats from a coherent ground-state superposition on the undriven mode of a two-mode cavity QED system. Continuous drive induces decoherence due to Rayleigh scattering. We control this with feedback.
DOI
10.1364/qim.2013.w5a.3

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Ground state quantum coherences, from quantum beats to strong control

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Second order correlations reveal quantum beats from a coherent ground-state superposition on the undriven mode of a two-mode cavity QED system. Continuous drive induces decoherence due to Rayleigh scattering. We control this with feedback.

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Cavity-QED Ground-State Coherence via Quantum Beats and Feedback Control — E8 Intelligence Research

Andrew Stewart Caldin

FINDING: Microtubule quantum-coherence claims remain speculative; the only rigorous mathematical result is cavity-QED ground-state coherence control via quantum beats and feedback. | MATH: Two-mode cavity QED Hamiltonian with undriven mode; second-order correlation \(g^{(2)}(\tau)\) reveals coherent ground-state superposition; continuous drive induces decoherence rate \(\Gamma_{\text{Rayleigh}}\) from Rayleigh scattering; feedback control modifies effective dissipation; postselection projects onto desired coherence subspace. No explicit constants or ratios given in abstract. | CONNECTION: None directly — no golden ratios, base-60, or crystallographic symmetries appear in the cited cavity-QED work. Microtubule geometry (13 protofilaments, 3-start helix) implies a helical lattice with screw symmetry, but no quantitative link to 0.618/1.618 is provided in these sources. | DEPTH: 2 — The cavity-QED result is real but narrow (quantum optics control). The microtubule "quantum computer" claim Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com

•Sep 28, 2026•0 citations
\nConditional measurements on the undriven mode of a two-mode cavity QED system prepare a coherent superposition of ground states which generate quantum beats. The continuous system drive induces decoherence through the phase interruptions from Rayleigh scattering, which manifests as a decrease of the beat amplitude and an increase of the frequency of oscillation. We report recent experiments that implement a simple feedback mechanism to protect the quantum beat. We continuously drive the system until a photon is detected, heralding the presence of a coherent superposition. We then turn off the drive and let the superposition evolve in the dark, protecting it against decoherence. At a later time we reinstate the drive to measure the amplitude, phase, and frequency of the beats. The amplitude can increase by more than fifty percent, while the frequency is unchanged by the feedback.\n
We implement a simple feedback mechanism on a two-mode cavity QED system to preserve the Zeeman coherence of a ground state superposition that generates quantum beats on the second-order correlation function. Our investigation includes theoretical and experimental studies that show how to prevent a shift away from the Larmor frequency and associated decoherence caused by Rayleigh scattering. The protocol consists of turning off the drive of the system after the detection of a first photon and letting it evolve in the dark. Turning the drive back on after a pre-set time reveals a phase accumulated only from Larmor precession, with the amplitude of the quantum beat more than a factor of two larger than with continuous drive.
Conditional measurements on the undriven mode of a two-mode cavity QED system prepare a coherent superposition of ground states which generate quantum beats. The continuous system drive induces decoherence through the phase interruptions from Rayleigh scattering, which manifests as a decrease of the beat amplitude and an increase of the frequency of oscillation. We report recent experiments that implement a simple feedback mechanism to protect the quantum beat. We continuously drive the system until a photon is detected, heralding the presence of a coherent superposition. We then turn off the drive and let the superposition evolve in the dark, protecting it against decoherence. At a later time we reinstate the drive to measure the amplitude, phase, and frequency of the beats. The amplitude can increase by more than fifty percent, while the frequency is unchanged by the feedback.
We probe a ground-state superposition that produces a quantum beat in the intensity correlation of a two-mode cavity QED system. We mix drive with scattered light from an atomic beam traversing the cavity, and effectively measure the interference between the drive and the light from the atom. When a photon escapes the cavity, and upon detection, it triggers our feedback which modulates the drive at the same beat frequency but opposite phase for a given time window. This results in a partial interruption of the beat oscillation in the correlation function, that then returns to oscillate.
FINDING: Microtubule quantum-coherence claims remain speculative; the only rigorous mathematical result is cavity-QED ground-state coherence control via quantum beats and feedback. | MATH: Two-mode cavity QED Hamiltonian with undriven mode; second-order correlation g(2)(τ)g^{(2)}(\tau)g(2)(τ) reveals coherent ground-state superposition; continuous drive induces decoherence rate ΓRayleigh\Gamma_{\text{Rayleigh}}ΓRayleigh​ from Rayleigh scattering; feedback control modifies effective dissipation; postselection projects onto desired coherence subspace. No explicit constants or ratios given in abstract. | CONNECTION: None directly — no golden ratios, base-60, or crystallographic symmetries appear in the cited cavity-QED work. Microtubule geometry (13 protofilaments, 3-start helix) implies a helical lattice with screw symmetry, but no quantitative link to 0.618/1.618 is provided in these sources. | DEPTH: 2 — The cavity-QED result is real but narrow (quantum optics control). The microtubule "quantum computer" claim Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com