Alternative Scheme for Generation of Atomic Schrödinger Cat States and Entangled Coherent States in an Optical Cavity

In this paper, we consider the generalized Schrödinger cat states. Using these states, we obtain the corresponding quasi-Bell states and the reduced density operator. For these quasi-Bell states, we investigate the non-classical effects such as oscillatory photon statistics, sub-Poissonian property and violation of the Cauchy–Schwarz inequality.

Download Full-text

Engineering Schrödinger cat states with a photonic even-parity detector

Quantum ◽

10.22331/q-2020-03-02-239 ◽

2020 ◽

Vol 4 ◽

pp. 239 ◽

Cited By ~ 5

Author(s):

G. S. Thekkadath ◽

B. A. Bell ◽

I. A. Walmsley ◽

A. I. Lvovsky

Keyword(s):

Time Reversal ◽

Coherent States ◽

Beam Splitter ◽

Photon Number ◽

Input State ◽

Interference Phenomenon ◽

Arbitrary Size ◽

Two Component ◽

Schrödinger Cat ◽

Cat States

When two equal photon-number states are combined on a balanced beam splitter, both output ports of the beam splitter contain only even numbers of photons. Consider the time-reversal of this interference phenomenon: the probability that a pair of photon-number-resolving detectors at the output ports of a beam splitter both detect the same number of photons depends on the overlap between the input state of the beam splitter and a state containing only even photon numbers. Here, we propose using this even-parity detection to engineer quantum states containing only even photon-number terms. As an example, we demonstrate the ability to prepare superpositions of two coherent states with opposite amplitudes, i.e. two-component Schrödinger cat states. Our scheme can prepare cat states of arbitrary size with nearly perfect fidelity. Moreover, we investigate engineering more complex even-parity states such as four-component cat states by iteratively applying our even-parity detector.

Download Full-text

A TREATMENT OF THE QUANTUM PARTIAL ENTROPIES IN THE ATOM-FIELD INTERACTION WITH A CLASS OF SCHRÖDINGER CAT STATES

International Journal of Quantum Information ◽

10.1142/s0219749905001092 ◽

2005 ◽

Vol 03 (03) ◽

pp. 591-602 ◽

Cited By ~ 8

Author(s):

A.-S. F. OBADA ◽

H. A. HESSIAN ◽

MAHMOUD ABDEL-ATY

Keyword(s):

Coherent State ◽

Coherent States ◽

Stark Shift ◽

Initial State ◽

Field Interaction ◽

Composite State ◽

Quantum Dynamical ◽

Initial States ◽

Schrödinger Cat ◽

Cat States

This paper is an enquiry into the circumstances under which entropy and subentropy methods can give an answer to the question of quantum entanglement in the composite state. Using a general quantum dynamical system, we obtain the analytical solution when the atom initially starts from its excited state and the field in different initial states. Different features of the entanglement are investigated when the field is initially assumed to be in a coherent state, an even coherent state (Schrödinger cate state), and a statistical mixture of coherent states. Our results show that the setting of the initial state and the Stark shift play important roles in the evolution of the sub-entropies and entanglement.

Download Full-text

q-Deformed Barut–Girardello su(1, 1) coherent states and Schrödinger cat states

Theoretical and Mathematical Physics ◽

10.1134/s0040577917120108 ◽

2017 ◽

Vol 193 (3) ◽

pp. 1844-1852 ◽

Cited By ~ 1

Author(s):

Yuefeng Zhao ◽

Yan Zeng ◽

Honggang Liu ◽

Qi Song ◽

Gangcheng Wang ◽

...

Keyword(s):

Coherent States ◽

Schrödinger Cat ◽

Cat States

Download Full-text

Efficient Scheme for the Generation of Atomic Schrödinger Cat States in an Optical Cavity

Communications in Theoretical Physics ◽

10.1088/0253-6102/40/1/103 ◽

2003 ◽

Vol 40 (1) ◽

pp. 103-104 ◽

Cited By ~ 2

Author(s):

Zheng Shi-Biao ◽

Lin Li-Hua ◽

Jiang Yun-Kun

Keyword(s):

Optical Cavity ◽

Efficient Scheme ◽

Schrödinger Cat ◽

Cat States

Download Full-text

Generation of optical Schrödinger cat states in intense laser–matter interactions

Nature Physics ◽

10.1038/s41567-021-01317-w ◽

2021 ◽

Vol 17 (10) ◽

pp. 1104-1108 ◽

Cited By ~ 3

Author(s):

M. Lewenstein ◽

M. F. Ciappina ◽

E. Pisanty ◽

J. Rivera-Dean ◽

P. Stammer ◽

...

Keyword(s):

Intense Laser ◽

Schrödinger Cat ◽

Cat States

Download Full-text

Phase-space studies of backscattering diffraction of defective Schrödinger cat states

Scientific Reports ◽

10.1038/s41598-021-90738-x ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Damian Kołaczek ◽

Bartłomiej J. Spisak ◽

Maciej Wołoszyn

Keyword(s):

Phase Space ◽

Dispersive Medium ◽

Wigner Distribution ◽

Interference Term ◽

Wigner Distribution Function ◽

The Subject ◽

Schrödinger Cat ◽

Cat States ◽

Schrodinger Cat State ◽

Space Approach

AbstractThe coherent superposition of two well separated Gaussian wavepackets, with defects caused by their imperfect preparation, is considered within the phase-space approach based on the Wigner distribution function. This generic state is called the defective Schrödinger cat state due to this imperfection which significantly modifies the interference term. Propagation of this state in the phase space is described by the Moyal equation which is solved for the case of a dispersive medium with a Gaussian barrier in the above-barrier reflection regime. Formally, this regime constitutes conditions for backscattering diffraction phenomena. Dynamical quantumness and the degree of localization in the phase space of the considered state as a function of its imperfection are the subject of the performed analysis. The obtained results allow concluding that backscattering communication based on the defective Schrödinger cat states appears to be feasible with existing experimental capabilities.

Download Full-text