H. Carmichael

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To catch and reverse a quantum jump mid-flight

Nature

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The path to “turbulence”: Optical bistability and universality in the ring cavity

Optics Communications, 1981

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The path to “turbulence”: Optical bistability and universality in the ring cavity

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Mutual Coherence and Interference in Resonance Fluorescence

Physical Review Letters, 1995

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Mutual Coherence and Interference in Resonance Fluorescence

Physical Review Letters - PHYS REV LETT, 1995

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Stochastic Schr篓odinger equations: what they mean and what they can do

The quantum mechanics we use in quantum optics is rather different from that taught in the standa... more The quantum mechanics we use in quantum optics is rather different from that taught in the standard quantum mechanics course. It is, of course, the same quantum mechanics; but the emphasis is different. Two observations illustrate what I mean. First, quantum optics emphasizes dissipative systems, open systems. The most notable of these is the laser, but a rather long list could be given which would include close relatives such as the parametric oscillator and a litany of systems involving resonance fluorescence. Second, quantum optics has always had close ties to the issue of quantum measurement. This theme goes back to the beginnings of the subject and Glauber’s quantum theory of coherence, which is founded on the multi-coincidence rates measured in photoelectric detection.

Optical Bistability and Multimode Instabilities

Physical Review Letters, 1984

Reference is made to the observation by several investigators that in a high-finesse cavity, Iked... more Reference is made to the observation by several investigators that in a high-finesse cavity, Ikeda's (1979, 1980) instability most readily occurs with the injected field tuned midway between cavity resonances. It is noted that the fundamental period of oscillation, at twice the cavity round-trip time, is just the beat frequency between the injected field and the adjacent cavity modes. It is shown here that a very general symmetry underlies this observation. This symmetry identifies an entire class of multimode instabilities in a cavity tuned between resonances as counterparts to conventional optical bistability. Given a short medium-response time or a long cavity, where cavity dynamics are described by a nonlinear map, a one-to-one correspondence exists between bistable and oscillatory systems. In this case, the theory of both absorptive and dispersive bistability can be transferred wholesale to a description of corresponding oscillatory instabilities. What is more, the ensuring oscillations occur between states on the S-shaped bistability curves. A simple relationship converts the theory of optical bistability into a theory of multimode instability and self-oscillation in a ring cavity excited between cavity resonances.

Quantum Teleportation of the Temporal Fluctuations of Light

Physical Review Letters, 2009

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Nonlinear oscillator behavior in the Jaynes-Cummings model

Physical Review A, 1996

The driven Jaynes-Cummings model shows collapses and revivals of the mean photon number on a time... more The driven Jaynes-Cummings model shows collapses and revivals of the mean photon number on a time scale much longer than the revival time for the two-state inversion. The behavior is essentially that of a nonlinear quantum oscillator with Hamiltonian {ital H}={radical}({cflx {ital A}}{sup {degree}}+{alpha})({cflx {ital A}}+{alpha}). {copyright} {ital 1996 The American Physical Society.}

Coherence and decoherence in the interaction of light with atoms

Physical Review A, 1997

Decoherence of a two-state atom driven by coherent light

Physical Review A, 2005

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Effect of atomic beam alignment on photon correlation measurements in cavity QED

Physical Review A, 2007

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Spontaneous emission in a standing-wave cavity: Quantum-mechanical center-of-mass motion

Physical Review A, 1995

We solve the spontaneous-emission problem for an atom coupled to a standing-wave cavity mode. The... more We solve the spontaneous-emission problem for an atom coupled to a standing-wave cavity mode. The interaction between the atom and the cavity mode is treated nonperturbatively with the quantized motion of the atom along the cavity axis included. Results are presented for the spontaneous-emission spectrum and the final momentum distribution of the atom. For equal atomic and cavity linewidths analytical

Classical interpretation of ‘‘Additional vacuum-field Rabi splittings in cavity QED’’

Physical Review A, 1991

Nonlinear analysis of quantum fluctuations in absorptive optical bistability

Physical Review A - PHYS REV A, 1986

ABSTRACT

Decoherence of a two-state atom driven by coherent light

Physical Review A, 2005

Recent studies of the decoherence induced by the quantum nature of the laser field driving a two-... more Recent studies of the decoherence induced by the quantum nature of the laser field driving a two-state atom [J. Gea-Banacloche, Phys. Rev. A 65, 022308 (2002); S. J. van Enk and H. J. Kimble, Quantum Inf. Comput. 2, 1 (2002)] have been questioned by Itano [W. M. Itano, Phys. Rev. A 68, 046301 (2003)] and the proposal made that all decoherence is due to spontaneous emission. We analyze the problem within the formalism of cascaded open quantum systems. Our conclusions agree with the Itano proposal. We show that the decoherence, nevertheless, may be divided into two parts---that due to forwards scattering and to scattering out of the laser mode. Previous authors attribute the former to the quantum nature of the laser field.

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Giant violations of classical inequalities through conditional homodyne detection of the quadrature amplitudes of light

Physical Review Letters, 2000

Conditional homodyne detection is proposed as an extension of the intensity correlation technique... more

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Entangled-state cycles from conditional quantum evolution

by Mile Gu and H. Carmichael

Physical Review A, Jan 1, 2006

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Quantum State Reduction and Conditional Time Evolution of Wave-Particle Correlations in Cavity QED

Physical Review Letters, 2000

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Quantum trajectory simulations of two-state behavior in an optical cavity containing one atom

Physical Review A, 1992

Under conditions of strong dipole coupling an optical cavity containing one atom behaves as a two... more Under conditions of strong dipole coupling an optical cavity containing one atom behaves as a two-state system when excited near one of the ``vacuum'' Rabi resonances. A coherent driving field induces a dynamic Stark splitting of the ``vacuum'' Rabi resonance. We demonstrate this two-state behavior in computer experiments based on quantum trajectory simulations.