scholarly journals Coherent-state superpositions in cavity quantum electrodynamics with trapped ions

2005 ◽  
Vol 71 (6) ◽  
Author(s):  
F. L. Semião ◽  
A. Vidiella-Barranco
Keyword(s):  
Coherent State ◽  
Quantum Electrodynamics ◽  
Cavity Quantum Electrodynamics ◽  
Trapped Ions

The influence of excitation number of photon-added coherent state field on the entanglement swapping process

2017 ◽  
Vol 31 (27) ◽  
pp. 1750198 ◽  
Author(s):  
M. Soltani ◽  
M. K. Tavassoly ◽  
R. Pakniat
Keyword(s):  
Coherent State ◽  
Quantum Electrodynamics ◽  
Coherent States ◽  
Success Probability ◽  
Entanglement Swapping ◽  
Cavity Quantum Electrodynamics ◽  
Linear Entropy ◽  
Entangled State ◽  
Maximally Entangled State ◽  
Coherent Field

In this paper, we outline a scheme for the entanglement swapping procedure based on cavity quantum electrodynamics using the Jaynes–Cummings model consisting of the coherent and photon-added coherent states. In particular, utilizing the photon-added coherent states ([Formula: see text][Formula: see text][Formula: see text][Formula: see text], where [Formula: see text] is the Glauber coherent state) in the scheme, enables us to investigate the effect of [Formula: see text], i.e., the number of excitations corresponding to the photon-added coherent field on the entanglement swapping process. In the scheme, two two-level atoms [Formula: see text] and [Formula: see text] are initially entangled together, and distinctly two exploited cavity fields [Formula: see text] and [Formula: see text] are prepared in an entangled state (a combination of coherent and photon-added coherent states). Interacting the atom [Formula: see text] with field [Formula: see text] (via the Jaynes–Cummings model) and then making detection on them, transfers the entanglement from the two atoms [Formula: see text], [Formula: see text] and the two fields [Formula: see text], [Formula: see text] to the atom-field “[Formula: see text]-[Formula: see text]”, i.e., entanglement swapping occurs. In the continuation, we pay our attention to the evaluation of the fidelity of the swapped entangled state relative to a suitable maximally entangled state, success probability of the performed detections and linear entropy as the degree of entanglement of the swapped entangled state. It is demonstrated that, an increase in the number of excitations, [Formula: see text], leads to the increment of fidelity as well as the amount of entanglement. According to our numerical results, the maximum values of fidelity (linear entropy) 0.98 (0.46) is obtained for [Formula: see text], however, the maximum value of success probability does not significantly change by increasing [Formula: see text].

scholarly journals Deterministic cavity quantum electrodynamics with trapped ions

2003 ◽  
Vol 36 (3) ◽  
pp. 613-622 ◽  
Author(s):  
M Keller ◽  
B Lange ◽  
K Hayasaka ◽  
W Lange ◽  
H Walther
Keyword(s):  
Quantum Electrodynamics ◽  
Cavity Quantum Electrodynamics ◽  
Trapped Ions

Photon-added Bell-type entangled coherent state and some nonclassical properties

2009 ◽  
Vol 87 (12) ◽  
pp. 1233-1245 ◽  
Author(s):  
Hong-Chun Yuan ◽  
Heng-Mei Li ◽  
Hong-Yi Fan
Keyword(s):  
Coherent State ◽  
Quantum Electrodynamics ◽  
Coherent States ◽  
Cavity Quantum Electrodynamics ◽  
Quantum Measurements ◽  
Nonclassical Properties ◽  
Entangled Coherent State ◽  
Creation Operators ◽  
Photon Excitations ◽  
Entangled Coherent States

We introduce a class of the photon-added Bell-type entangled coherent states (PABECSs) obtained from Bell-type entangled coherent states by applying creation operators. We investigate their entanglement characteristics by analyzing the entropy of entanglement and discuss the influence of photon excitations on quantum entanglement. It is shown that applying a creation operator can increase the amount of entanglement. We also study the statistical properties of such states by discussing the behavior of the quasi-probability functions graphically. In addition, a possible scheme is presented to produce the PABECSs by using cavity quantum electrodynamics and quantum measurements.

scholarly journals Intrinsically ultrastrong plasmon–exciton interactions in crystallized films of carbon nanotubes

2018 ◽  
Vol 115 (50) ◽  
pp. 12662-12667 ◽  
Author(s):  
Po-Hsun Ho ◽  
Damon B. Farmer ◽  
George S. Tulevski ◽  
Shu-Jen Han ◽  
Douglas M. Bishop ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Quantum Electrodynamics ◽  
Near Infrared ◽  
Cavity Quantum Electrodynamics ◽  
Optical Switches ◽  
Optical Antennas ◽  
Strongly Coupled ◽  
Exciton Coupling ◽  
Exciton Interactions ◽  
Nanotube Films

In cavity quantum electrodynamics, optical emitters that are strongly coupled to cavities give rise to polaritons with characteristics of both the emitters and the cavity excitations. We show that carbon nanotubes can be crystallized into chip-scale, two-dimensionally ordered films and that this material enables intrinsically ultrastrong emitter–cavity interactions: Rather than interacting with external cavities, nanotube excitons couple to the near-infrared plasmon resonances of the nanotubes themselves. Our polycrystalline nanotube films have a hexagonal crystal structure, ∼25-nm domains, and a 1.74-nm lattice constant. With this extremely high nanotube density and nearly ideal plasmon–exciton spatial overlap, plasmon–exciton coupling strengths reach 0.5 eV, which is 75% of the bare exciton energy and a near record for room-temperature ultrastrong coupling. Crystallized nanotube films represent a milestone in nanomaterials assembly and provide a compelling foundation for high-ampacity conductors, low-power optical switches, and tunable optical antennas.

Cavity quantum electrodynamics

2006 ◽  
Vol 69 (5) ◽  
pp. 1325-1382 ◽  
Author(s):  
Herbert Walther ◽  
Benjamin T H Varcoe ◽  
Berthold-Georg Englert ◽  
Thomas Becker
Keyword(s):  
Quantum Electrodynamics ◽  
Cavity Quantum Electrodynamics
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