Spin chains for two-qubit teleportation

Tony J. G. Apollaro, Guilherme M. A. Guilherme, Salvatore Lorenzo, Alessandro Ferraro, Simone Paganelli

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
70 Downloads (Pure)


Generating high-quality multi-particle entanglement between communicating parties is the primary resource in quantum teleportation protocols. To this aim, we show that the natural dynamics of a single spin chain is able to sustain the generation of two pairs of Bell states –possibly shared between a sender and a distant receiver– which can in turn enable two-qubit teleportation. In particular, we address a spin- 1 2 chain with XX interactions, connecting two pairs of spins located at its boundaries, playing the roles of sender and receiver. In the regime where both end pairs are weakly coupled to the spin chain, it is possible to generate at predefinite times a state that has vanishing infidelity with the product state of two Bell pairs, thereby providing nearly unit fidelity of teleportation. We also derive an effective Hamiltonian via a second-order perturbation approach that faithfully reproduces the dynamics of the full system.
Original languageEnglish
Article number052308
Number of pages9
JournalPhysical Review A (Atomic, Molecular, and Optical Physics)
Early online date06 Nov 2019
Publication statusEarly online date - 06 Nov 2019


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