Heisenberg spin bus as a robust transmission line for quantum-state transfer

Sangchul Oh, Lian Ao Wu, Yun Pil Shim, Jianjia Fei, Mark Friesen, Xuedong Hu

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

We study quantum-state transfer (QST) through a strongly coupled antiferromagnetic spin chain (acting as a spin bus), between weakly coupled external qubits. By treating the weak coupling as a perturbation, we find that QST is enabled specifically by the second-order terms in the perturbative expansion. We show that QST is robust against disorder in the couplings, either within the bus or to the external qubits. We find that the protocol works when the qubits are attached to any node on an even-size bus or to the antiferromagnetic nodes on an odd-size bus. The optimal time for QST is found to depend nonmonotonically on qubit separation.

Original languageEnglish
Article number022330
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume84
Issue number2
DOIs
Publication statusPublished - 24 Aug 2011
Externally publishedYes

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transmission lines
disorders
perturbation
expansion

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Heisenberg spin bus as a robust transmission line for quantum-state transfer. / Oh, Sangchul; Wu, Lian Ao; Shim, Yun Pil; Fei, Jianjia; Friesen, Mark; Hu, Xuedong.

In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 84, No. 2, 022330, 24.08.2011.

Research output: Contribution to journalArticle

Oh, Sangchul ; Wu, Lian Ao ; Shim, Yun Pil ; Fei, Jianjia ; Friesen, Mark ; Hu, Xuedong. / Heisenberg spin bus as a robust transmission line for quantum-state transfer. In: Physical Review A - Atomic, Molecular, and Optical Physics. 2011 ; Vol. 84, No. 2.
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