6533b7d8fe1ef96bd126af32
RESEARCH PRODUCT
Spin chains for two-qubit teleportation
Guilherme M. A. AlmeidaSimone PaganelliTony J. G. ApollaroSalvatore LorenzoAlessandro Ferrarosubject
PhysicsQuantum PhysicsSpinsmedia_common.quotation_subjectQuantum communication Quantum entanglement Quantum teleportation 1-dimensional spin chains Quantum InformationFidelityFOS: Physical sciencesQuantum entanglementQuantum Physics01 natural sciencesTeleportationNatural dynamics010305 fluids & plasmasCondensed Matter - Other Condensed Mattersymbols.namesakeQuantum mechanicsQubit0103 physical sciencessymbols010306 general physicsHamiltonian (quantum mechanics)Quantum Physics (quant-ph)Quantum teleportationmedia_commonOther Condensed Matter (cond-mat.other)description
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-11-06 |