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.

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

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 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.

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