We study the entanglement dynamics for two independent superconducting qubits, each affected by a bistable impurity generating random telegraph noise (RTN) at pure dephasing. The relevant parameter is the ratio g between the qubit–RTN coupling strength and the RTN switching rate, which captures the physics of the crossover between Markovian and non-Markovian features of the dynamics. For identical qubit–RTN subsystems, a threshold value gth of the crossover parameter separates exponential decay and the onset of revivals; different qualitative behaviors also show up by changing the initial conditions of the RTN. We also show that, for different qubit–RTN subsystems, when both qubits are very strongly coupled to the RTN, an increase of entanglement revival amplitude may occur during the dynamics.

Lo Franco, R., D’Arrigo, A., Falci, G., Compagno, G., Paladino E (2012). Entanglement dynamics in superconducting qubits affected by local bistable impurities. PHYSICA SCRIPTA, 2012(T147), 014019 [10.1088/0031-8949/2012/T147/014019].

Entanglement dynamics in superconducting qubits affected by local bistable impurities

LO FRANCO, Rosario;COMPAGNO, Giuseppe;
2012-01-01

Abstract

We study the entanglement dynamics for two independent superconducting qubits, each affected by a bistable impurity generating random telegraph noise (RTN) at pure dephasing. The relevant parameter is the ratio g between the qubit–RTN coupling strength and the RTN switching rate, which captures the physics of the crossover between Markovian and non-Markovian features of the dynamics. For identical qubit–RTN subsystems, a threshold value gth of the crossover parameter separates exponential decay and the onset of revivals; different qualitative behaviors also show up by changing the initial conditions of the RTN. We also show that, for different qubit–RTN subsystems, when both qubits are very strongly coupled to the RTN, an increase of entanglement revival amplitude may occur during the dynamics.
Settore FIS/03 - Fisica Della Materia
http://iopscience.iop.org/1402-4896/2012/T147/014019
Lo Franco, R., D’Arrigo, A., Falci, G., Compagno, G., Paladino E (2012). Entanglement dynamics in superconducting qubits affected by local bistable impurities. PHYSICA SCRIPTA, 2012(T147), 014019 [10.1088/0031-8949/2012/T147/014019].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/66593
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