Abstract We study the performances of quantum channel adaptive [4,1] code transmitting in a joint amplitude damping and dephasing channel, the [6,2] code transmitting in an amplitude damping channel by combining the encoding, noise process, and decoding as one effective channel. We explicitly obtain the entanglement fidelities. The recovery operators of the [6,2] code are given. The performance is nearly optimal comparing with that of the optimal method of semidefinite programming.
Received: 16 March 2012
Revised: 22 June 2012
Accepted manuscript online:
PACS:
03.67.Pp
(Quantum error correction and other methods for protection against decoherence)
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60972071), the Natural Science Foundation of Zhejiang Province, China (Grant Nos. Y6100421 and LQ12F02012), and the Zhejiang Province Science and Technology Project, China (Grant No. 2009C31060).
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
