Doppler and transit broadening effects inherent in a thermal atomic beam reduce the size of quantum fluctuations in a cavity QED system. A cold continuous atomic beam would reduce these effects, but would not eliminate the different atom–field couplings associated with the random distribution of atoms throughout the cavity. We present results that describe the effect that this has on quantum fl...

Photon correlation measurements reveal the response of the conditional evolution of the cavity QED system to a novel quantum feedback protocol. A photodetection collapses the state of the system and triggers a feedback pulse with an adjustable delay and amplitude that alters the intensity driving the system. The conditional evolution of the system freezes into a new steady state where it reside...

Cavity quantum electrodynamics, which explores the granularity of light by coupling a resonator to nonlinear emitter1, has played foundational role in development modern information science and technology. In parallel, field condensed matter physics been revolutionized discovery underlying topological2–4, often arising from breaking time-reversal symmetry, as case Hall effect. this work, we exp...

Understanding physical properties of quantum emitters strongly interacting with quantized electromagnetic modes is one the primary goals in emergent field waveguide electrodynamics (QED). When light-matter coupling strength comparable to or even exceeds energies elementary excitations, conventional approaches based on perturbative treatment interactions, two-level description matter and photon-...

A scheme is proposed to obtain three-qubit gates, such as quantum-phase gate and C2-NOT gate operations, in a cavity QED system where highly detuned cavity-field modes interact with a four-level system in an inverted-Y configuration. The influence of the Stark shift is also included in such proposed gate operations. Since only the metastable lower levels are involved in the gate operations, the...