Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Quantum Electronics and Laser Science Conference

Atom-cavity dynamics in the limit of ultraslow atomic decoherence

Christoph M. Greiner, B. Boggs, THOMAS W. MOSSBERG

Published Jan 1, 2000• 0 citations
OpenAlex

Abstract

Summary form only given. An underlying premise of quantum computing is the preservation of system coherence over long time scales. Here, we report studies of atom-cavity dynamics wherein behavior observed is distinctively related to the ultraslow atomic decoherence found in one such system. In our experiment, the atomic decoherence time is four orders of magnitude longer than the empty-cavity lifetime, making the atomic coherence the longest-lived system parameter. The phenomenon we observe here may be loosely thought of as cavity-mediated self-driven optical nutation, i.e., optical nutation driven by the active atoms own coherent emission into the cavity mode.

Related papers

Quantum area gate: experimental demonstration

Christoph M. Greiner, B. Boggs, T. Wang +1 more

Summary form only given. In quantum computing, the precise control of input variables used to initialize computational systems is vital for reliable system performance. A parameter that lends itself naturally to the preparation of coherent atomic dynamics used in computation is optical pulse area, i.e. time-integrated resonant Rabi frequency. It is therefore desirable to identify phenomena and demonstrate devices that provide the functionality that allows the controlled manipulation of this parameter. Here, we report the first observation of a novel phenomenon governing the pulse area transmission through an optical cavity containing atoms exhibiting ultraslow atomic decoherence.

Quantum Electronics and Laser Science Conference•Nov 13, 2002•0 citations

Entanglement, Decoherence and Correlations in a Strongly Driven Jaynes-Cummings System

Federico Casagrande, ALFREDO LULLI

We consider the resonant interaction of a cavity mode with a two-level atom that is driven by a coherent field while it crosses the cavity. Starting from the cavity field in a coherent state, we show that the state of the system can reach the maximum entanglement after a unitary evolution for long enough interaction times. Also we illustrate how the generation of cavity field superposition states can allow, in the open system dynamics, the observation of their decoherence in atomic correlation measurements, for any initial cavity field state, and even under the combined effects of dissipation, thermal noise, and atomic pumping.

Open Systems & Information Dynamics•Nov 13, 2006•4 citations

Driven-dissipative quantum dynamics in ultra-long-lived dipoles in an optical cavity

Diego Barberena, Robert J. Lewis-Swan, James K. Thompson +1 more

We study the quantum dynamics of many-body arrays of two-level atoms in a driven cavity subject to collective decay and interactions mediated by the cavity field. We work in the bad cavity limit accessible, for example, using long-lived electronic clock states of alkaline-earth atoms, for which the bare atomic linewidth is much less than the cavity linewidth. In the absence of interactions, our system reduces to previously studied models of collective fluorescence. We show that while interactions do not qualitatively change the steady-state properties they lead to a drastic change in the dynamical properties. We find that, for some intervals of driving strengths, the system shows two very distinct types of transient behaviors that depend on the initial state of the system. In particular, there is a parameter regime where the system features oscillatory dynamics with a period of oscillation that becomes much shorter than the duration of the overall transient dynamics as the atom number increases. We use both mean-field and exact numerical calculations of the quantum system to investigate the dynamics.

arXiv:1812.02291•Physical Review A•May 14, 2019•49 citations

Collapse and revival dynamics in a driven Jaynes-Cummings system

P. M. Alsing, Vassilios I. Kovanis, David A. Cardimona

A single atom coupled to a quantized mode of an electromagnetic cavity, driven by an external coherent field, is described by the Hamiltonian H djc = ig(a†σ− − aσ+) + iε(a† − a), where (a†, a) and (σ+, σ) are the raising and lowering operators for the cavity mode and atom, respectively. This is the single atom version of the Hamiltonian used in the study of optical bistability. It describes the evolution of the atom-cavity system on time scales much smaller than the inverse spontaneous emission and cavity decay rates. For 2ε/g < 1, HDJC possesses a discrete set of interaction eigenstates1 with eigenvalues E n ± = ± g n [ 1 − ( 2 ε / g ) 2 ] 3 / 4 . These form a renormalized version of the usual Jaynes-Cummings eigenstates2, which correctly take into account the effect of the driving field to all orders of magnitude. We investigate the collapse and revival nature of the dynamical evolution of the single atom in a cavity, with and without dissipation and above and below the threshold 2ε/g = 1 of the driven Jaynes-Cummings Hamiltonian.

Annual Meeting Optical Society of America•Jan 1, 1992•0 citations

Quantum Rabi nutation in vacuum and coherent fields: a direct test of field quantization in a cavity

M. Brune, J. M. Raimond, Ferdinand Schmidt‐Kaler +4 more

Summary form only given. We report here the first observation of the Rabi nutation of an atom in vacuum and in controlled coherent fields. Atomic and cavity relaxations are small enough to permit the observation of four oscillation periods in vacuum and the resolution of several individual frequency components when a field is injected.

•Jun 7, 1996•0 citations

Experiments in two-mode cavity QED

D. G. Norris

Cavity quantum electrodynamics (QED) allows the study of light-matter in-teractions at the most basic level, through precise identification of the coherent and incoherent (dissipative) parts of the system evolution. We present measurements of light from a cavity QED system consisting of a high-finesse optical resonator coupled to a beam of cold Rb atoms. The novelty of the design lies in the interplay of two degenerate and orthogonal polarization modes. One mode (driven) behaves as the canonical cavity mode of the Jaynes-Cummings Hamiltonian, coherently exciting the atoms with a modest coupling strength; the other mode (undriven) collects a small fraction of spontaneously emitted light and provides a probe of the dissipative processes. We first demonstrate the ability to detect individual atoms passing through the cavity modes in real time by coincidence detection of photons from the un-driven mode. Calculation of statistics and correlation functions from the complete photon detection record allows the determination of detection probabilities and the reconstruction of atomic trajectories. We next present evidence of quantum coher-ence that is created, modified, and measured in the excitation-spontaneous emission cycle. The coherence appears as a long-lived quantum beat at the ground-state Larmor frequency, visible in the intensity autocorrelation function of the undriven mode. Quantum jumps of the atomic state, occurring in between the detections of photons from the cavity, result in substantial changes in the frequency and spectral width of the beats. We present the results of a full quantum Monte Carlo calculation in order to quantitatively explain the measurements.

•Jan 1, 2011•0 citations
Summary form only given. An underlying premise of quantum computing is the preservation of system coherence over long time scales. Here, we report studies of atom-cavity dynamics wherein behavior observed is distinctively related to the ultraslow atomic decoherence found in one such system. In our experiment, the atomic decoherence time is four orders of magnitude longer than the empty-cavity lifetime, making the atomic coherence the longest-lived system parameter. The phenomenon we observe here may be loosely thought of as cavity-mediated self-driven optical nutation, i.e., optical nutation driven by the active atoms own coherent emission into the cavity mode.
Summary form only given. In quantum computing, the precise control of input variables used to initialize computational systems is vital for reliable system performance. A parameter that lends itself naturally to the preparation of coherent atomic dynamics used in computation is optical pulse area, i.e. time-integrated resonant Rabi frequency. It is therefore desirable to identify phenomena and demonstrate devices that provide the functionality that allows the controlled manipulation of this parameter. Here, we report the first observation of a novel phenomenon governing the pulse area transmission through an optical cavity containing atoms exhibiting ultraslow atomic decoherence.
We consider the resonant interaction of a cavity mode with a two-level atom that is driven by a coherent field while it crosses the cavity. Starting from the cavity field in a coherent state, we show that the state of the system can reach the maximum entanglement after a unitary evolution for long enough interaction times. Also we illustrate how the generation of cavity field superposition states can allow, in the open system dynamics, the observation of their decoherence in atomic correlation measurements, for any initial cavity field state, and even under the combined effects of dissipation, thermal noise, and atomic pumping.
We study the quantum dynamics of many-body arrays of two-level atoms in a driven cavity subject to collective decay and interactions mediated by the cavity field. We work in the bad cavity limit accessible, for example, using long-lived electronic clock states of alkaline-earth atoms, for which the bare atomic linewidth is much less than the cavity linewidth. In the absence of interactions, our system reduces to previously studied models of collective fluorescence. We show that while interactions do not qualitatively change the steady-state properties they lead to a drastic change in the dynamical properties. We find that, for some intervals of driving strengths, the system shows two very distinct types of transient behaviors that depend on the initial state of the system. In particular, there is a parameter regime where the system features oscillatory dynamics with a period of oscillation that becomes much shorter than the duration of the overall transient dynamics as the atom number increases. We use both mean-field and exact numerical calculations of the quantum system to investigate the dynamics.
A single atom coupled to a quantized mode of an electromagnetic cavity, driven by an external coherent field, is described by the Hamiltonian H djc = ig(a†σ− − aσ+) + iε(a† − a), where (a†, a) and (σ+, σ) are the raising and lowering operators for the cavity mode and atom, respectively. This is the single atom version of the Hamiltonian used in the study of optical bistability. It describes the evolution of the atom-cavity system on time scales much smaller than the inverse spontaneous emission and cavity decay rates. For 2ε/g < 1, HDJC possesses a discrete set of interaction eigenstates1 with eigenvalues E n ± = ± g n [ 1 − ( 2 ε / g ) 2 ] 3 / 4 . These form a renormalized version of the usual Jaynes-Cummings eigenstates2, which correctly take into account the effect of the driving field to all orders of magnitude. We investigate the collapse and revival nature of the dynamical evolution of the single atom in a cavity, with and without dissipation and above and below the threshold 2ε/g = 1 of the driven Jaynes-Cummings Hamiltonian.
Cavity quantum electrodynamics (QED) allows the study of light-matter in-teractions at the most basic level, through precise identification of the coherent and incoherent (dissipative) parts of the system evolution. We present measurements of light from a cavity QED system consisting of a high-finesse optical resonator coupled to a beam of cold Rb atoms. The novelty of the design lies in the interplay of two degenerate and orthogonal polarization modes. One mode (driven) behaves as the canonical cavity mode of the Jaynes-Cummings Hamiltonian, coherently exciting the atoms with a modest coupling strength; the other mode (undriven) collects a small fraction of spontaneously emitted light and provides a probe of the dissipative processes. We first demonstrate the ability to detect individual atoms passing through the cavity modes in real time by coincidence detection of photons from the un-driven mode. Calculation of statistics and correlation functions from the complete photon detection record allows the determination of detection probabilities and the reconstruction of atomic trajectories. We next present evidence of quantum coher-ence that is created, modified, and measured in the excitation-spontaneous emission cycle. The coherence appears as a long-lived quantum beat at the ground-state Larmor frequency, visible in the intensity autocorrelation function of the undriven mode. Quantum jumps of the atomic state, occurring in between the detections of photons from the cavity, result in substantial changes in the frequency and spectral width of the beats. We present the results of a full quantum Monte Carlo calculation in order to quantitatively explain the measurements.