Revisiting maximal average fidelity of teleportation

BUSSANDRI, D.G.; MARIELA PORTESI; MAJTEY, ANA P.

PHYSICA A - STATISTICAL AND THEORETICAL PHYSICS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2022

0378-4371

e obtain the maximal average fidelity corresponding to the standard quantum teleportation protocol for an arbitrary isotropic distribution of input states and an arbitrary resource state. We extend this result to a family of von Neumann measurements, which includes the projections onto the computational and Bell basis, considering a Bell-diagonal resource state. We focus on three specific isotropic distributions of input states: (1) completely mixed input states, (2) states with a certain (fixed) degree of purity, and (3) quasi-pure input states. We show that the standard quantum teleportation protocol can teleport arbitrary mixed states with higher average fidelity than its classical counterpart even when the resource of the protocol is a non-entangled state, specifically, a separable Werner state. Moreover, we find that the maximum average fidelity obtained with classical?quantum states used as a resource in a standard teleportation protocol also exceeds the classical fidelity. To e