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29 papers · 2 filters
Breakdown of the coherent state path integral: two simple examples
Justin H. Wilson, Victor Galitski
We show how the time-continuous coherent state path integral breaks down for both the single-site Bose-Hubbard model and the spin path integral. Specifically, when the Hamiltonian…
Non-Equilibrium Fluctuation-Dissipation Inequality and Non-Equilibrium Uncertainty Principle
C. H. Fleming, B. L. Hu, Albert Roura
The fluctuation-dissipation relation is usually formulated for a system interacting with a heat bath at finite temperature in the context of linear response theory, where only smal…
Non-Markovian Dynamics and Entanglement of Two-level Atoms in a Common Field
C. H. Fleming, N. I. Cummings, Charis Anastopoulos +1
We derive the stochastic equations and consider the non-Markovian dynamics of a system of multiple two-level atoms in a common quantum field. We make only the dipole approximation…
Majorana path integral for nonequilibrium dynamics of two-level systems
Tigran A. Sedrakyan, Victor M. Galitski
We present a new field-theoretic approach to anaylize non-equilirbium dynamics of two-level systems (TLS), which is based on a correspondence between a driven TLS and a Majorana fe…
Sharp phase transitions in a small frustrated network of trapped ion spins
G. -D. Lin, C. Monroe, L. -M. Duan
Sharp quantum phase transitions typically require a large system with many particles. Here we show that for a frustrated fully-connected Ising spin network represented by trapped a…
Correlated photon pairs generated from a warm atomic ensemble
R. T. Willis, F. E. Becerra, L. A. Orozco +1
We present measurements of the cross-correlation function of photon pairs at 780 nm and 1367 nm, generated in a hot rubidium vapor cell. The temporal character of the biphoton is d…