6533b851fe1ef96bd12a8eb9
RESEARCH PRODUCT
Entanglement dynamics in superconducting qubits affected by local bistable impurities
Elisabetta PaladinoGiuseppe CompagnoAntonio D'arrigoRosario Lo FrancoGiuseppe Falcisubject
BistabilityDephasingCrossoverquantum statistical methodEntanglement measures witnesses and other characterizations Decoherence; open systems; quantum statistical methods; Quantum computation architectures and implementationsFOS: Physical sciencesQuantum computation architectures and implementationsQuantum entanglement01 natural sciencesNoise (electronics)Settore FIS/03 - Fisica Della Materia010305 fluids & plasmasComputer Science::Emerging TechnologiesQuantum mechanics0103 physical sciencesExponential decay010306 general physicsMathematical PhysicsEntanglement measures witnesses and other characterizations DecoherencePhysicsQuantum PhysicsQuantum PhysicsCondensed Matter PhysicsAtomic and Molecular Physics and OpticsAmplitudeQubitopen systemQuantum Physics (quant-ph)description
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 qubit-RTN coupling strength and RTN switching rate, that captures the physics of the crossover between Markovian and non-Markovian features of the dynamics. For identical qubit-RTN subsystems, a threshold value $g_\mathrm{th}$ of the crossover parameter separates exponential decay and onset of revivals; different qualitative behaviors also show up by changing the initial conditions of the RTN. We moreover show that, for different qubit-RTN subsystems, when both qubits are very strongly coupled to the RTN an increase in entanglement revival amplitude may occur during the dynamics.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-01-01 |