Transfer of arbitrary two-qubit states via a spin chain

Gioacchino Massimo Palma, Salvatore Lorenzo, Apollaro, Paganelli, Plastina, Palma

Risultato della ricerca: Articlepeer review

38 Citazioni (Scopus)

Abstract

We investigate the fidelity of the quantum state transfer (QST) of two qubits by means of an arbitrary spin- 1/2 network, on a lattice of any dimensionality. Under the assumptions that the network Hamiltonian preserves themagnetization and that a fully polarized initial state is taken for the lattice, we obtain a general formula for the average fidelity of the two qubits QST, linking it to the one- and two-particle transfer amplitudes of the spin excitations among the sites of the lattice. We then apply this formalism to a 1D spin chain with XX-Heisenberg type nearest-neighbour interactions adopting a protocol that is a generalization of the single qubit one proposed in Paganelli et al. [Phys. Rev. A 87, 062309 (2013)]. We find that a high-quality two qubit QST can be achieved provided one can control the local fields at sites near the sender and receiver. Under such conditions, we obtain an almost perfect transfer in a time that scales either linearly or, depending on the spin number, quadratically with the length of the chain.
Lingua originaleEnglish
Numero di pagine8
RivistaPHYSICAL REVIEW A
Volume91
Stato di pubblicazionePublished - 2015

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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