Generation and stabilization of a three-qubit entangled W state in circuit QED via quantum feedback control

Huang, Shang-Yu, Goan, Hsi-Sheng, Li, Xin-Qi and Milburn G.J. (2013) Generation and stabilization of a three-qubit entangled W state in circuit QED via quantum feedback control. Physical Review A - Atomic, Molecular, and Optical Physics, 88 6: 062311.1-062311.11. doi:10.1103/PhysRevA.88.062311

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Author Huang, Shang-Yu
Goan, Hsi-Sheng
Li, Xin-Qi
Milburn G.J.
Title Generation and stabilization of a three-qubit entangled W state in circuit QED via quantum feedback control
Formatted title
Generation and stabilization of a three-qubit entangled W state in circuit QED via quantum feedback control
Journal name Physical Review A - Atomic, Molecular, and Optical Physics   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 2013-12
Year available 2013
Sub-type Article (original research)
DOI 10.1103/PhysRevA.88.062311
Open Access Status File (Publisher version)
Volume 88
Issue 6
Start page 062311.1
End page 062311.11
Total pages 11
Place of publication College Park, United States
Publisher American Physical Society
Collection year 2014
Language eng
Formatted abstract
Circuit cavity quantum electrodynamics (QED) is proving to be a powerful platform to implement quantum feedback control schemes due to the ability to control superconducting qubits and microwaves in a circuit. Here, we present a simple and promising quantum feedback control scheme for deterministic generation and stabilization of a three-qubit W state in the superconducting circuit QED system. The control scheme is based on continuous joint Zeno measurements of multiple qubits in a dispersive regime, which enables us not only to infer the state of the qubits for further information processing but also to create and stabilize the target W state through adaptive quantum feedback control. We simulate the dynamics of the proposed quantum feedback control scheme using the quantum trajectory approach with an effective stochastic maser equation obtained by a polaron-type transformation method and demonstrate that in the presence of moderate environmental decoherence, the average state fidelity higher than 0.9 can be achieved and maintained for a considerably long time (much longer than the single-qubit decoherence time). This control scheme is also shown to be robust against measurement inefficiency and individual qubit decay rate differences. Finally, the comparison of the polaron-type transformation method to the commonly used adiabatic elimination method to eliminate the cavity mode is presented.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
 
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