https://doi.org/10.1140/epjd/e2019-90588-y
Regular Article
Schemes to avoid entanglement sudden death of decohering two qubit system
Department of Physics, Pondicherry University,
Puducherry
605 014, India
a e-mail: svmsatya@gmail.com
Received:
25
October
2018
Received in final form:
20
December
2018
Published online: 14 February 2019
We investigate the entanglement dynamics of two interacting qubits in a common vacuum environment. The inevitable environment interaction leads to entanglement sudden death (ESD) in a two qubit entangled system. The entanglement dynamics can be modified by the use of local unitary operations (quantum gates), applied on the system during its evolution. We show that these operations not only delays or avoids the ESD but also advances the entanglement revival with an enhanced entanglement depending on the time of operation. We have analytically found out different time windows for switching with different quantum gates so that the ESD can be completely avoided in the subsequent evolution of the system. Our result offers practical applications in the field of quantum information processing where the entanglement is a necessary resource.
Key words: Quantum Information
© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature, 2019