| Issue |
EPL
Volume 89, Number 4, February 2010
|
|
|---|---|---|
| Article Number | 48005 | |
| Number of page(s) | 4 | |
| Section | Interdisciplinary Physics and Related Areas of Science and Technology | |
| DOI | https://doi.org/10.1209/0295-5075/89/48005 | |
| Published online | 08 March 2010 | |
Partial-measurement–induced entanglement dynamics in a Josephson-junction system
Key Laboratory of Quantum Information University of Science and Technology of China, CAS - Hefei, 230026,
PRC
Corresponding author: cfli@ustc.edu.cn
Received:
16
December
2009
Accepted:
8
February
2010
We study the continuous-partial-measurement–induced entanglement dynamics of two phase qubits in a superconducting loop coupled by capacity. It is shown that entanglement does not change monotonously during the measurement process, and is robust against small fluctuations of the tunneling probability. We find entanglement sudden birth induced by continuous partial measurement for an initially separable state. Furthermore, we show that with the help of continuous partial measurement an almost pure state can be generated from a totally mixed state.
PACS: 85.25.Dq – Superconducting quantum interference devices (SQUIDs) / 03.67.-a – Quantum information / 03.65.Ta – Foundations of quantum mechanics; measurement theory
© EPLA, 2010
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