2012/01/25 by Vincent Pouthier, Vincent J. C. Pouthier
Computer Science · Physics and Astronomy · #Algorithm #Computer science #Exciton #Physics #Quantum #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum mechanics #Simple (philosophy) #Spectroscopy and Quantum Chemical Studies #State (computer science) #Transfer (computing) #cond-mat.other #quant-ph
paper · pdf · doi:10.1103/physrevb.85.214303
13
arxiv created 2012/01/25 · openalex publication_date 2012/06/14 · arxiv updated 2015/06/03 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A communication protocol is proposed in which quantum state transfer is mediated by a vibrational exciton. We consider two distant molecular groups grafted on the sides of a one-dimensional lattice. These groups behave as two quantum computers where the information in encoded and received. The lattice plays the role of a communication channel along which the exciton propagates and interacts with a phonon bath. Special attention is paid to describing the system involving an exciton dressed by a single phonon mode. The Hamiltonian is thus solved exactly so that the relevance of the perturbation theory is checked. Within the nonadiabatic weak-coupling limit, it is shown that the system supports three quasidegenerate states that define the relevant paths followed by the exciton to tunnel between the computers. When the model parameters are judiciously chosen, constructive interferences take place between these paths. Phonon-induced decoherence is minimized and a high-fidelity quantum state transfer occurs over a broad temperature range.