Quantum information of a three-level atom in one-dimensional photonic bandgaps

2006 ◽  
Vol 3 (12) ◽  
pp. 599-604 ◽  
Author(s):  
M Abdel-Aty ◽  
F Saif
Keyword(s):  
Quantum Information ◽  
Photonic Bandgaps ◽  
One Dimensional ◽  
Level Atom

scholarly journals Tutorial Notes on One-Party and Two-Party Gaussian States

2003 ◽  
Vol 01 (02) ◽  
pp. 153-188 ◽  
Author(s):  
Berthold-Georg Englert ◽  
Krzysztof Wódkiewicz
Keyword(s):  
Quantum Information ◽  
Phase Space ◽  
Characteristic Function ◽  
Information Science ◽  
Operator Method ◽  
Two Dimensional ◽  
Quantum Information Science ◽  
Gaussian States ◽  
One Dimensional ◽  
Practical Applications

Gaussian states — or, more generally, Gaussian operators — play an important role in Quantum Optics and Quantum Information Science, both in discussions about conceptual issues and in practical applications. We describe, in a tutorial manner, a systematic operator method for first characterizing such states and then investigating their properties. The central numerical quantities are the covariance matrix that specifies the characteristic function of the state, and the closely related matrices associated with Wigner's and Glauber's phase space functions. For pedagogical reasons, we restrict the discussion to one-dimensional and two-dimensional Gaussian states, for which we provide illustrating and instructive examples.

QUANTUM INFORMATION PROCESSING IN AN ARRAY OF SUPERCONDUCTING TRANSMISSION LINE RESONATORS

2009 ◽  
Vol 07 (06) ◽  
pp. 1255-1267
Author(s):  
JIAN LI ◽  
JIAN ZOU ◽  
BIN SHAO
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Transmission Line ◽  
Quantum State ◽  
Quantum Information Processing ◽  
Quantum State Transfer ◽  
Superconducting Qubit ◽  
One Dimensional ◽  
Dimensional Array ◽  
State Transfer

We consider a one-dimensional array of superconducting transmission line resonators (TLRs). The TLRs are coupled by current-biased Josephson junctions, which act as tunable couplers between each two nearest TLRs, and a superconducting qubit is fabricated in the center of each TLR. We show that some important quantum information processing, such as quantum state transfer and preparation of remote entanglement, can be achieved in this system, and we also propose a scheme for generating the W-class states.

scholarly journals Quantum information processing with quantum zeno many-body dynamics

2010 ◽  
Vol 10 (3&4) ◽  
pp. 201-222
Author(s):  
A. Monras ◽  
O. Romero-Isart
Keyword(s):  
Quantum Information ◽  
Quantum Information Processing ◽  
Quantum Zeno Effect ◽  
Quantum State Transfer ◽  
Many Body ◽  
One Dimensional ◽  
Zeno Effect ◽  
State Transfer ◽  
Body Dynamics ◽  
Universal Quantum

We show how the quantum Zeno effect can be exploited to control quantum many-body dynamics for quantum information and computation purposes. In particular, we consider a one dimensional array of three level systems interacting via a nearest-neighbour interaction. By encoding the qubit on two levels and using simple projective frequent measurements yielding the quantum Zeno effect, we demonstrate how to implement a well defined quantum register, quantum state transfer on demand, universal two-qubit gates and two-qubit parity measurements. Thus, we argue that the main ingredients for universal quantum computation can be achieved in a spin chain with an {\em always-on} and {\em constant} many-body Hamiltonian. We also show some possible modifications of the initially assumed dynamics in order to create maximally entangled qubit pairs and single qubit gates.

Transmittance properties of a quasi-periodic one-dimensional photonic crystals that incorporate nanocomposite material

2018 ◽  
Vol 32 (21) ◽  
pp. 1850220 ◽  
Author(s):  
Arafa H. Aly ◽  
Christina Malek ◽  
Hussein A. Elsayed
Keyword(s):  
Photonic Crystals ◽  
Volume Fraction ◽  
Dielectric Material ◽  
Optical Switches ◽  
Numerical Results ◽  
Nanocomposite Material ◽  
Characteristic Matrix ◽  
Photonic Bandgaps ◽  
One Dimensional ◽  
Transmission Properties

In this paper, we investigate theoretically the transmission properties of one-dimensional quasi-periodic photonic crystals that containing nanocomposite material in the IR wavelength regions. Our structure is particularly designed using the Fibonacci role. Here, the nanocomposite material is composed of nanoparticles of Ag that are randomly immersed in a host dielectric material of SiO2. Numerical results are mainly investigated based on the well-known characteristic matrix method. The numerical results show the appearance of many photonic bandgaps due to the multiple periodicities of our structure. Furthermore, the effects of the parameters of the nanocomposite such as the volume fraction, the refractive index of the dielectric material and the size of the nanoparticles have distinct effects on the transmittance characteristics of our structure. Wherefore, the proposed structure could be considered the cornerstone for many applications such as multichannel filters and optical switches.

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