scholarly journals Localized Excitation of Single Atom to a Rydberg State with Structured Laser Beam for Quantum Information

2019 ◽  
Author(s):  
Leila Mashhadi ◽  
Gholamreza Shayeganrad
Keyword(s):  
Quantum Information ◽  
Laser Beam ◽  
Rydberg State ◽  
Single Atom

On the classical character of control fields in quantum information processing

2002 ◽  
Vol 2 (1) ◽  
pp. 1-13
Author(s):  
S.J. van Enk ◽  
H.J. Kimble
Keyword(s):  
Quantum Computing ◽  
Information Processing ◽  
Quantum Information ◽  
Laser Beam ◽  
Quantum State ◽  
Quantum Communication ◽  
Quantum Information Processing ◽  
Laser Fields ◽  
Undesirable Property

Control fields in quantum information processing are almost by definition assumed to be classical. In reality, however, when such a field is used to manipulate the quantum state of qubits, the qubits always become slightly entangled with the field. For quantum information processing this is an undesirable property, as it precludes perfect quantum computing and quantum communication. Here we consider the interaction of atomic qubits with laser fields and quantify atom-field entanglement in various cases of interest. We find that the entanglement decreases with the average number of photons \bar{n} in a laser beam as $E\propto\log_2 \bar{n}/\bar{n}$ for $\bar{n}\rightarrow\infty$.

Quantum Information

MRS Bulletin ◽  
2005 ◽  
Vol 30 (2) ◽  
pp. 99-104 ◽  
Author(s):  
Luiz Davidovich
Keyword(s):  
Quantum Information ◽  
San Francisco ◽  
Quantum Physics ◽  
Quantum Algorithms ◽  
Rapid Development ◽  
Superposition Principle ◽  
Deep Understanding ◽  
Single Atom ◽  
Recent Developments ◽  
Fundamental Research

AbstractThe following article is based on the plenary address by Luiz Davidovich (Federal University of Rio de Janeiro), presented on April 14, 2004, at the 2004 MRS Spring Meeting in San Francisco. The field of quantum information is a discipline that aims to investigate methods for characterizing, transmitting, storing, compressing, and computationally utilizing the information carried by quantum states. It owes its rapid development over the last few years to several factors: the ability, developed in several laboratories, to control and measure simple microscopic systems; the discovery of fast quantum algorithms; and the recognition that Moore's law will soon lead to the single-atom limit of elementary computing gates.Cryptography and quantum computing are among the main applications in the field.They rely on the subtle and fundamental properties of the quantum world: the unavoidable disturbance associated with measurement, the superposition principle, and the nonlocal properties of entangled states. Progress in this area is intimately connected to a deep understanding of quantum physics: recent achievements include the experimental demonstration of teleportation and detailed investigations of the role of the environment in the quantum–classical transition. This article reviews basic concepts and recent developments in the field of quantum information, emphasizing the close ties between fundamental research and possible applications.

scholarly journals Quantum Computation and Quantum Information by Michael E. Nielson and Isaac L. Chuang

2003 ◽  
Vol 1 (2) ◽  
pp. 120-121
Author(s):  
Neeraj Sinha
Keyword(s):  
Quantum Mechanics ◽  
Quantum Information ◽  
Quantum Computation ◽  
Semiconductor Industry ◽  
Atomic Level ◽  
Present Form ◽  
Single Atom ◽  
Large Size ◽  
Physical Laws ◽  
Ultimate Limit

One of the most promising scieniifc of East century was the Computers. Computers of initial days were of very large size consisting vacuum tubes ond valves. This has taken over by sernicor-,ductor and transistors which were 0' smaller size and more efficient. The rapid growth in the semiconductor industry hos led to the present form computer on our desktop. This hos initiated the questions about the ultimate limit of this development. AS size Of computer chip is decreasing, if has been predicted by Moor's law that within next twenty year, the size Of a sing bit will be of the order of a single atom. Physical laws governing the atomic phenomena, such cs quantum mechanics, are very different from macroscopic laws. so the computers operating on atomic level will not be Same cs pæsent days computers. This possibility has openee c completely new field of Quantum Computation.

Approaching Single Atom Detection with Atomic Fluorescence in a Glow Discharge Atom Reservoir

1989 ◽  
Vol 43 (5) ◽  
pp. 873-876 ◽  
Author(s):  
B. W. Smith ◽  
J. B. Womack ◽  
N. Omenetto ◽  
J. D. Winefordner
Keyword(s):  
Detection Limit ◽  
Glow Discharge ◽  
Laser Beam ◽  
Hollow Cathode ◽  
Single Atom ◽  
Atomic Fluorescence ◽  
Discharge Source ◽  
Atom Detection ◽  
Atomization Characteristics ◽  
Glow Discharge Source

A commercial hollow cathode lamp is used as an atom reservoir for the atomic fluorescence of lead excited by a copper laser pumped dye laser. The glow discharge source is nearly an ideal atom cell for such measurements, having very low background emission and excellent atomization characteristics. A detection limit of 1.8 ag of lead within the laser beam is easily obtained.

scholarly journals Coherent excitation of a single atom to a Rydberg state

2010 ◽  
Vol 82 (1) ◽  
Author(s):  
Y. Miroshnychenko ◽  
A. Gaëtan ◽  
C. Evellin ◽  
P. Grangier ◽  
D. Comparat ◽  
...  
Keyword(s):  
Rydberg State ◽  
Single Atom ◽  
Coherent Excitation

scholarly journals Velocity-dependent optical forces and Maxwell’s demon

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
J. D. Franson
Keyword(s):  
Quantum Information ◽  
Laser Beam ◽  
Optical Tweezers ◽  
Optical Forces ◽  
Velocity Dependence ◽  
Photon Scattering ◽  
Maxwell’S Demon ◽  
Maxwell's Demon ◽  
Dipole Force ◽  
The Doppler Effect

Abstract An atom placed in a focused laser beam will experience a dipole force due to the gradient in the interaction energy, which is analogous to the well-known optical tweezers effect. This force will be dependent on the velocity of the atom due to the Doppler effect, which could potentially be used to implement a Maxwell’s demon. Photon scattering and other forms of dissipation can be negligibly small, which would seem to contradict quantum information proofs that a Maxwell’s demon must dissipate a minimum amount of energy. We show that the velocity dependence of the dipole force is cancelled out by another force that is related to the gradient in the phase of the laser beam. As a result, a Maxwell’s demon cannot be implemented in this way.

scholarly journals Distributed quantum information processing via single atom driving

2020 ◽  
Vol 53 (3) ◽  
pp. 035503 ◽  
Author(s):  
Jing-Xin Liu ◽  
Jun-Yao Ye ◽  
Lei-Lei Yan ◽  
Shi-Lei Su ◽  
Mang Feng
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Information Processing ◽  
Single Atom

UV laser beam switching system for Yb trapped ion quantum information processing

2012 ◽  
Author(s):  
David R. Scherer ◽  
Joel M. Hensley ◽  
Krishnan R. Parameswaran ◽  
Douglas J. Bamford ◽  
Emily Mount ◽  
...  
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Laser Beam ◽  
Quantum Information Processing ◽  
Switching System ◽  
Uv Laser ◽  
Trapped Ion ◽  
Beam Switching

Isotropic-coupled oscillators interacting with a single atom via two-photon processes: quantum information aspects

2004 ◽  
Vol 37 (4) ◽  
pp. 775-790 ◽  
Author(s):  
M Sebawe Abdalla ◽  
A-S F Obada ◽  
Mahmoud Abdel-Aty
Keyword(s):  
Quantum Information ◽  
Coupled Oscillators ◽  
Single Atom ◽  
Two Photon
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