Quantum state transfer through a spin chain in a multiexcitation subspace

Journal Article · Sun Jan 01 00:00:00 EST 2012 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.86.022330· OSTI ID:1052286

Wang, Zhao-Ming ^[1]; Ma, Rui-Song ^[2]; Bishop, Clifford A ^[3]; Gu, Yong-Jian ^[1]

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1. Department of Physics, Ocean University of China, Qingdao
2. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3. ORNL

We investigate the quality of quantum state transfer through a uniformly coupled antiferromagnetic spin chain in a multiexcitation subspace. The fidelity of state transfer using multiexcitation channels is found to compare well with communication protocols based on the ground state of a spin chain with ferromagnetic interactions. Our numerical results support the conjecture that the fidelity of state transfer through a multiexcitation subspace only depends on the number of initial excitations present in the chain and is independent of the excitation ordering. Based on these results, we describe a communication scheme which requires little effort for preparation.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Laboratory Directed Research and Development (LDRD) Program
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1052286
• Journal Information: Physical Review A, Vol. 86, Issue 1; ISSN 1050--2947
• Country of Publication: United States
• Language: English