scholarly journals Solid-state multiple quantum NMR in quantum information processing: exactly solvable models

2012 ◽  
Vol 370 (1976) ◽  
pp. 4690-4712 ◽  
Author(s):  
E. B. Fel'dman ◽  
A. N. Pyrkov ◽  
A. I. Zenchuk
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Solid State ◽  
Quantum Information Processing ◽  
Quantum Correlations ◽  
Multiple Quantum ◽  
Exactly Solvable Models ◽  
Solvable Models ◽  
Exactly Solvable ◽  
Large Clusters

Multiple quantum (MQ) NMR is an effective tool for the generation of a large cluster of correlated particles, which, in turn, represent a basis for quantum information processing devices. Studying the available exactly solvable models clarifies many aspects of the quantum information. In this study, we consider two exactly solvable models in the MQ NMR experiment: (i) the isolated system of two spin- particles (dimers) and (ii) the large system of equivalent spin- particles in a nanopore. The former model is used to describe the quantum correlations and their relations with the MQ NMR coherences, whereas the latter helps one to model the creation and decay of large clusters of correlated particles.

scholarly journals Solid-state NMR three-qubit homonuclear system for quantum-information processing: Control and characterization

2006 ◽  
Vol 73 (2) ◽  
Author(s):  
Jonathan Baugh ◽  
Osama Moussa ◽  
Colm A. Ryan ◽  
Raymond Laflamme ◽  
Chandrasekhar Ramanathan ◽  
...  
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Solid State ◽  
Solid State Nmr ◽  
Quantum Information Processing ◽  
Processing Control

Measurement-induced nonlocality in the two-qubit Heisenberg XY model

2015 ◽  
Vol 29 (15) ◽  
pp. 1550098 ◽  
Author(s):  
Wen-Xue Chen ◽  
Yu-Xia Xie ◽  
Xiao-Qiang Xi
Keyword(s):  
Magnetic Field ◽  
Information Processing ◽  
Quantum Information ◽  
External Magnetic Field ◽  
Potential Application ◽  
Quantum Correlation ◽  
Quantum Information Processing ◽  
Quantum Correlations ◽  
Xy Model ◽  
Anisotropic Parameter

Quantum correlations are essential for quantum information processing (QIP). Measurement-induced nonlocality (MIN) is a good measure of quantum correlation, and is favored for its conceptual implication and potential application. We investigated here the particular behaviors of the geometric and entropic measures of MIN in the two-qubit Heisenberg XY model and revealed the effects of anisotropic parameter γ and the external magnetic field B on them. Our results showed that both γ and B can serve as efficient controlling parameters for tuning MIN in the XY model.

DYNAMICAL CONTROL OF QUANTUM CORRELATIONS IN A COMMON ENVIRONMENT

2013 ◽  
Vol 11 (01) ◽  
pp. 1350012 ◽  
Author(s):  
HONGTING SONG ◽  
YU PAN ◽  
ZAIRONG XI
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Information Processing ◽  
Quantum Correlations ◽  
Quantum Systems ◽  
Common Environment ◽  
Qubit System ◽  
Long Time ◽  
Dynamical Control

Quantum correlations (QC) are generally considered to be the crucial resource for quantum information processing, however, in practice, the inevitable interaction of the quantum systems with the environment can cause decoherence and thus destroy the QC. In this paper, by comparatively studying the model of a two-qubit system in a common environment with and without dynamical control, we show that dynamical control can be exploited to protect QC from being completely destroyed for a long time. For certain product states, the dynamical control can even be used to generate the QC.

Thermal quantum correlations in a two-qubit Heisenberg XYZ model with different magnetic fields

2015 ◽  
Vol 13 (06) ◽  
pp. 1550046 ◽  
Author(s):  
Zheng Hu ◽  
Yu-Chen Wang ◽  
Xi-Wen Hou
Keyword(s):  
Magnetic Field ◽  
Information Processing ◽  
Quantum Information ◽  
Magnetic Fields ◽  
Finite Temperature ◽  
Quantum Discord ◽  
Quantum Information Processing ◽  
Quantum Correlations ◽  
Field Coupling ◽  
Magnetic Field Coupling

Two kinds of thermal quantum correlations, measured respectively by quantum discord (QD) and the generalized negativity (GN), are studied for various magnetic fields, couplings, and temperatures in a two-qubit Heisenberg XYZ model. It is shown that QD and GN can exhibit a similar behavior in some regions of magnetic field, coupling, and temperature, while they behave in a contrary manner in other regions. For example, QD may increase with suitable magnetic fields, couplings, and temperature when GN decreases. QD is more robust against temperature than GN, and can reveal a kink at a suitable coupling at finite temperature while GN cannot. Moreover, a nearly unchanged QD or GN can be obtained in a large region of magnetic field, coupling, and temperature. These adjustable QD and GN via the varied magnetic field, coupling, and temperature may have significant applications in quantum information processing.

scholarly journals Robust coherent control of solid-state spin qubits using anti-Stokes excitation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jun-Feng Wang ◽  
Fei-Fei Yan ◽  
Qiang Li ◽  
Zheng-Hao Liu ◽  
Jin-Ming Cui ◽  
...  
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Solid State ◽  
Color Center ◽  
Coherent Control ◽  
Quantum Information Processing ◽  
Spin Qubits ◽  
Silicon Vacancy ◽  
Quantum Sensing ◽  
Anti Stokes

AbstractOptically addressable solid-state color center spin qubits have become important platforms for quantum information processing, quantum networks and quantum sensing. The readout of color center spin states with optically detected magnetic resonance (ODMR) technology is traditionally based on Stokes excitation, where the energy of the exciting laser is higher than that of the emission photons. Here, we investigate an unconventional approach using anti-Stokes excitation to detect the ODMR signal of silicon vacancy defect spin in silicon carbide, where the exciting laser has lower energy than the emitted photons. Laser power, microwave power and temperature dependence of the anti-Stokes excited ODMR are systematically studied, in which the behavior of ODMR contrast and linewidth is shown to be similar to that of Stokes excitation. However, the ODMR contrast is several times that of the Stokes excitation. Coherent control of silicon vacancy spin under anti-Stokes excitation is then realized at room temperature. The spin coherence properties are the same as those of Stokes excitation, but with a signal contrast that is around three times greater. To illustrate the enhanced spin readout contrast under anti-Stokes excitation, we also provide a theoretical model. The experiments demonstrate that the current anti-Stokes excitation ODMR approach has promising applications in quantum information processing and quantum sensing.

scholarly journals Thermalization and quantum correlations in exactly solvable models

2012 ◽  
Vol 85 (1) ◽  
Author(s):  
Miguel A. Cazalilla ◽  
Anibal Iucci ◽  
Ming-Chiang Chung
Keyword(s):  
Quantum Correlations ◽  
Exactly Solvable Models ◽  
Solvable Models ◽  
Exactly Solvable

Dynamical decoupling of random telegraph noise in a two-qubit gate

2014 ◽  
Vol 12 (02) ◽  
pp. 1461008 ◽  
Author(s):  
A. D'Arrigo ◽  
G. Falci ◽  
E. Paladino
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Solid State ◽  
Quantum Information Processing ◽  
Analytic Form ◽  
Dynamical Decoupling ◽  
Random Telegraph Noise ◽  
Telegraph Noise ◽  
Gate Time ◽  
Qubit Gate

Controlling the dynamics of entanglement and preventing its disappearance are central requisites for any implementation of quantum information processing. Solid state qubits are frequently affected by random telegraph noise due to bistable impurities of different nature coupled to the device. In this paper, we investigate the possibility to achieve an efficient universal two-qubit gate in the presence of random telegraph noise by periodic dynamical decoupling. We find an analytic form of the gate error as a function of the number of applied pulses valid when the gate time is much shorter then the telegraphic process correlation time. The analysis is further supplemented by exact numerical results demonstrating the feasibility of a highly-efficient universal two-qubit gate.

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