Two-mode quantum interferometry with a single-mode Fock state and parity detection

Berry’s geometric phase naturally appears when a quantum system is driven by an external field whose parameters are slowly and cyclically changed. A variation in the coupling between the system and the external field can also give rise to a geometric phase, even when the field is in the vacuum state or any other Fock state. We demonstrate the appearance of a vacuum-induced Berry phase in an artificial atom, a superconducting transmon, interacting with a single mode of a microwave cavity. As we vary the phase of the interaction, the artificial atom acquires a geometric phase determined by the path traced out in the combined Hilbert space of the atom and the quantum field. Our ability to control this phase opens new possibilities for the geometric manipulation of atom-cavity systems also in the context of quantum information processing.

Download Full-text

Superposition of single-mode para-Bose coherent states: Generation and nonclassical properties

International Journal of Modern Physics A ◽

10.1142/s0217751x18501348 ◽

2018 ◽

Vol 33 (22) ◽

pp. 1850134 ◽

Cited By ~ 5

Author(s):

B. Mojaveri ◽

A. Dehghani ◽

R. Jafarzadeh Bahrbeig

Keyword(s):

Coherent States ◽

Essential Role ◽

Relative Phase ◽

Single Mode ◽

State Distribution ◽

Simple Scheme ◽

Nonclassical Properties ◽

Deformation Parameters ◽

Fock State

In this paper, we introduce two classes of superposed states generated by a superposition of two single-mode para-Bose coherent states (CS) with arbitrary relative phase factors. The first class is superposition of two opposite para-Bose CS and second class consists of two para-Bose CS, [Formula: see text] out of phase with each other. These states are reduced to the well-known superposed single-mode CS of the simple harmonic oscillator when the deformation parameter tends to one. We study the nonclassical properties of the introduced states by evaluating their para-Bose Fock state distribution, second-order squeezing, Klyshko’s and Mandel’s parameters. We investigate the essential role of coherent and deformation parameters on their nonclassicality. We show that some nonclassical properties of these states are different from those of the even and odd coherent states. Finally, we present a simple scheme for the physical generation of the introduced states.

Download Full-text

ENTANGLEMENT AND PHOTON DYNAMICS IN THE INTERACTION BETWEEN TWO QUANTIZED ELECTROMAGNETIC FIELDS AND 3-LEVEL ATOMS

International Journal of Quantum Information ◽

10.1142/s0219749911006703 ◽

2011 ◽

Vol 09 (01) ◽

pp. 593-605 ◽

Cited By ~ 1

Author(s):

B. VASEGHI ◽

G. REZAEI ◽

R. KHORDAD ◽

A. FALLAH ZADEH

Keyword(s):

Coherent State ◽

Electromagnetic Fields ◽

Atomic System ◽

Single Mode ◽

The Other ◽

Level Atom ◽

Number State ◽

Fock State ◽

The Mean ◽

Degree Of Entanglement

We study in this paper the dynamics of two electromagnetic (EM) fields and their entanglement in the interaction with a 3-level atom (Λ-configuration). We investigate the interaction when initially one of the fields is in a single mode coherent state, and the other one is in a Fock(number) state. We have calculated the mean photon numbers of the fields and their entanglement by means of the fields entropy as a measure of it. The results show the synchronization between entanglement beats and collapses-revivals of the fields, which cause the field in the Fock state (noncoherent) to behave coherently during the interaction. Also the results offer a way to generate coherent fields and achieve any desired degree of entanglement with specified dynamics via controlling the parameters of the atomic system.

Download Full-text

QUANTUM ENTANGLEMENT OF THREE ATOMS INDUCED BY FOCK STATE

International Journal of Modern Physics C ◽

10.1142/s0129183108012492 ◽

2008 ◽

Vol 19 (05) ◽

pp. 775-783

Author(s):

XIUWU WANG ◽

XIAOHONG ZHANG

Keyword(s):

Sudden Death ◽

Radiation Field ◽

Quantum Entanglement ◽

Single Mode ◽

Spin Squeezing ◽

Entanglement Sudden Death ◽

Intrinsic Decoherence ◽

Potential Measurement ◽

Fock State ◽

Quantized Radiation Field

In this paper, we study the quantum entanglement of three two-level atoms under the action of Fock state of a single-mode quantized radiation field. Milburn model is considered. Concurrence of the two atoms is given explicitly. As is expected, because of the intrinsic decoherence, Concurrence comes to a stationary value. A rule is summarized between this value and entanglement sudden death. As for the potential measurement of multi-particle entanglement, spin squeezing parameter is calculated.

Download Full-text