Quantum Entanglement and Correlations in Superconducting Flux Qubits
- 165 Downloads
We report on the quantum correlations dissipative dynamics followed by coupled superconducting flux qubits. The coupling between the superconducting quantum register and the reservoir is described by two different mechanisms: collective and independent decoherence. By means of the Bloch–Redfield formalism, we solve the quantum master equation and show that coupling under collective quantum noise is more robust to decoherence. This result is demonstrated for different flux qubit initial preparations, taking into account the influence due to external fields and temperature. Furthermore, we compute the entanglement and the quantum discord dissipative dynamics as controlled by external parameters. We show that the discord is more robust against decoherence effects. This fact could be harnessed in the realization of quantum computing tasks that do not need to invoke entanglement in their implementation.
KeywordsQuantum entanglement Quantum computation implementations Quantum noise Superconducting devices
This work was partially supported by the Vice-rectorship of Research of the Universidad del Valle.
- 11.Nielsen, M.A., Chuang, I.L.: Quantum Computation, Quantum Information. Cambridge University Press, Cambridge (2000) Google Scholar
- 12.Preskill, J.: Quantum Information and Computation. Lecture Notes for Physics, vol. 229. California Institute of Technology, Pasadena (1998) Google Scholar