scholarly journals EFFECTS OF CAVITY-FIELD STATISTICS ON ATOMIC ENTANGLEMENT IN THE JAYNES–CUMMINGS MODEL

2007 ◽  
Vol 05 (01n02) ◽  
pp. 169-177 ◽  
Author(s):  
BIPLAB GHOSH ◽  
A. S. MAJUMDAR ◽  
N. NAYAK
Keyword(s):  
Thermal Field ◽  
Photon Number ◽  
Cavity Field ◽  
Photon Field ◽  
Entanglement Of Formation ◽  
Fock State ◽  
Atomic Entanglement ◽  
Joint State

We study the entanglement properties of a pair of two-level atoms going through a cavity one after another. The initial joint state of two successive atoms that enter the cavity is unentangled. Interactions mediated by the cavity photon field result in the final two-atom state being of a mixed entangled type. We consider the field statistics of the Fock state field, and the thermal field, respectively, inside the cavity. The entanglement of formation of the joint two-atom state is calculated for both these cases as a function of the Rabi angle gt. We present a comparitive study of two-atom entanglement for low and high mean photon number cases corresponding to the different fields statistics.

COLLAPSE AND REVIVAL OF ATOMIC ENTANGLEMENT IN AN INTENSITY DEPENDENT JAYNES–CUMMINGS INTERACTION

2010 ◽  
Vol 08 (08) ◽  
pp. 1397-1409 ◽  
Author(s):  
P. SAHA ◽  
A. S. MAJUMDAR ◽  
S. SINGH ◽  
N. NAYAK
Keyword(s):  
Photon Number ◽  
Dynamical Process ◽  
Cavity Field ◽  
Cavity Coupling ◽  
Atomic Entanglement

The evolution of entanglement of a bipartite spin-1/2 system coupled to a micromaser cavity field in an intensity-dependent Jaynes–Cummings model is studied in this paper. The dynamical process of the entanglement is investigated for different cavity fields. We find that the interactions lead to a phenomenon of periodic entanglement and disentanglement between the qubits. Effects such as the growth of the magnitude of atomic entanglement with the increase of the cavity photon number, arising out of the intensity-dependent atom-cavity coupling lead to interesting dissimilarities from the case of entanglement generated by the standard Jaynes–Cummings interaction.

scholarly journals Macroscopic displaced thermal field as the entanglement catalyst

2007 ◽  
Vol 7 (8) ◽  
pp. 775-781
Author(s):  
S.-B. Zheng
Keyword(s):  
Thermal Field ◽  
Cavity Mode ◽  
Thermal State ◽  
Atomic System ◽  
Photon Number ◽  
Resonant Interaction ◽  
Entangled State ◽  
Cavity Field ◽  
Average Photon Number

We show that entanglement of multiple atoms can arise via resonant interaction with a displaced thermal field with a macroscopic photon-number. The cavity field acts as the catalyst, which is disentangled with the atomic system after the operation. Remarkably, the entanglement speed does not decrease as the average photon-number of the mixed thermal state increases. The atoms may evolve to a highly entangled state even when the photon-number of the cavity mode approaches infinity.

ENTANGLING TWO MULTIATOM CLUSTERS VIA A SINGLE-MODE THERMAL FIELD

2011 ◽  
Vol 25 (20) ◽  
pp. 2681-2696 ◽  
Author(s):  
S. R. J. PATRICK ◽  
YANG YANG ◽  
ZHANG-QI YIN ◽  
FU-LI LI
Keyword(s):  
Thermal Field ◽  
Photon Number ◽  
Single Mode ◽  
Cavity Field ◽  
Thermal Photon ◽  
Atom Clusters ◽  
Level Atom ◽  
The Mean ◽  
Single Mode Cavity

We consider a system consisting of two multiple two-level-atom clusters simultaneously interacting with a single-mode cavity field. Entanglement of the two clusters is investigated by use of the negativity measure. We find that the entanglement can be not only induced by a thermal field but also enhanced by increasing the mean thermal photon number.

scholarly journals Probing higher order correlations of the photon field with photon number resolving avalanche photodiodes

2011 ◽  
Vol 19 (14) ◽  
pp. 13268 ◽  
Author(s):  
J. F. Dynes ◽  
Z. L. Yuan ◽  
A. W. Sharpe ◽  
O. Thomas ◽  
A. J. Shields
Keyword(s):  
Avalanche Photodiodes ◽  
Photon Number ◽  
Higher Order ◽  
Photon Field

scholarly journals Optimal time-resolved photon number distribution reconstruction of a cavity field by maximum likelihood

2012 ◽  
Vol 14 (11) ◽  
pp. 115007 ◽  
Author(s):  
C Sayrin ◽  
I Dotsenko ◽  
S Gleyzes ◽  
M Brune ◽  
J M Raimond ◽  
...  
Keyword(s):  
Maximum Likelihood ◽  
Photon Number ◽  
Optimal Time ◽  
Cavity Field ◽  
Time Resolved ◽  
Number Distribution ◽  
Photon Number Distribution

The influence of the classical homogenous gravitational field on interaction of a three-level atom with a single mode cavity field

2015 ◽  
Vol 29 (29) ◽  
pp. 1550175 ◽  
Author(s):  
N. H. Abd El-Wahab ◽  
Ahmed Salah
Keyword(s):  
Electromagnetic Field ◽  
Gravitational Field ◽  
Photon Number ◽  
Single Mode ◽  
Temporal Behavior ◽  
Cavity Field ◽  
Text Type ◽  
Level Atom ◽  
The Mean ◽  
Single Mode Cavity

We study the interaction between a single mode electromagnetic field and a three-level [Formula: see text]-type atom in the presence of a classical homogenous gravitational field when the atom is prepared initially in the momentum eigenstate. The model includes the detuning parameters and the classical homogenous gravitational field. The wave function is calculated by using the Schrödinger equation for a coherent electromagnetic field and an atom is in its excited state. The influence of the detuning parameter and the classical homogenous gravitational field on the temporal behavior of the mean photon number, the normalized second-order correlation function and the normal squeezing is analyzed. The results show that the presence of these parameters has an important effect on these phenomena. The conclusion is reached and some features are given.

scholarly journals Optical Bistability in an Optomechanical System with N-Type Atoms under Nonresonant Conditions

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 122
Author(s):  
Yan Gao ◽  
Li Deng ◽  
Aixi Chen
Keyword(s):  
Optical Bistability ◽  
Light Field ◽  
Photon Number ◽  
Optical Switches ◽  
Atomic Ensemble ◽  
Cavity Field ◽  
Bistable Behavior ◽  
Optomechanical System ◽  
The Mean ◽  
Nonlinear Distribution

In this paper, the phenomenon of the optical bistability of a cavity field is theoretically investigated in an optomechanical system containing an N-type atomic ensemble. In this hybrid optomechanical system, the atoms are coupled with two controlling light fields besides coupling with the cavity field. Under the nonresonant condition, we analyze the influences of the coupling strength between cavity and atoms, Rabi frequencies of the controlling light field, the detuning between the controlling light field and atoms, and pump field power on the optical bistable behavior of mean intracavity photon number. The nonlinear distribution of the mean intracavity photon number has a potential application in field optical switches and optical bistable devices.

DYNAMICS AND NONCLASSICAL PHOTON STATISTICS IN THE INTERACTION OF TWO-LEVEL SPIN SYSTEMS WITH A TWO-MODE CAVITY FIELD: A GENERALIZED JAYNES-CUMMINGS MODEL

2008 ◽  
Vol 22 (06) ◽  
pp. 599-633 ◽  
Author(s):  
HORACIO GRINBERG
Keyword(s):  
Time Evolution ◽  
Spin System ◽  
Evolution Operator ◽  
Photon Number ◽  
Perturbation Expansion ◽  
Coupling Constants ◽  
Operator Matrix ◽  
Cavity Field ◽  
Photon Distribution ◽  
Time Evolution Operator

The interaction of a two-level XYn-spin system with a two-mode cavity field is investigated through a generalized Jaynes-Cummings model in the rotating wave approximation. The spontaneous decay of a spin level was treated by considering the interaction of the two-level spin system with the modes of the universe in the vacuum state. The different cases of interest, characterized in terms of a detuning parameter for each mode, which emerge from the nonvanishing of certain commutation relations between interaction picture Hamiltonians associated with each mode, were analytically implemented and numerically discussed for various values of the initial mean photon number and spin-photon coupling constants. Photon distribution, time evolution of the spin population inversion, as well as the statistical properties of the field leading to the possible production of nonclassical states, such as antibunched light and violations of the Cauchy-Schwartz inequality are examined for an excited initial state. It was assumed that the two modes are initially in coherent states and have the same photon distribution. The case of zero detuning of both modes was treated in terms of a linearization of the expansion of the time evolution operator, while in other three cases, the computations were conducted via second- and third-order Dyson perturbation expansion of the time evolution operator matrix elements for the excited and ground states respectively.

DECOHERENCE-FREE MULTIPARTITE ATOMIC ENTANGLEMENT IN A CAVITY QED SYSTEM

2009 ◽  
Vol 07 (supp01) ◽  
pp. 229-235 ◽  
Author(s):  
MATTEO BINA ◽  
FEDERICO CASAGRANDE ◽  
ALFREDO LULLI
Keyword(s):  
Cavity Qed ◽  
Cavity Mode ◽  
Cavity Field ◽  
Analytical Results ◽  
Atomic Subsystem ◽  
Atomic Entanglement ◽  
Decoherence Free Subspaces

We present analytical results on entanglement and decoherence in a system of N strongly driven two-level atoms resonantly coupled to a dissipative cavity mode. In the specific cases of N = 3 and 4 qubits we show the existence of decoherence-free subspaces for the whole system and/or the atomic subsystem and we discuss examples where a multipartite qubit entanglement remains preserved. Also we illustrate the conditional preparation of cat-like states of the cavity field and the generation of atomic correlations.

Sign in / Sign up

Export Citation Format

Share Document