Enhancing teleportation fidelity by means of weak measurements or reversal

• The method’s probabilistic nature should be responsible for the improvement.
• Quantum or classical correlation cannot explain the improvement.
• The receiver cannot apply weak measurements.
• The sender’s quantum measurement reversal is only useful for |Ψ±〉|Ψ±〉.

The enhancement of teleportation fidelity by weak measurement or quantum measurement reversal is investigated. One qubit of a maximally entangled state undergoes the amplitude damping, and the subsequent application of weak measurement or quantum measurement reversal could improve the teleportation fidelity beyond the classical region. The improvement could not be attributed to the increasing of entanglement, quantum discord, classical correlation or total correlation. We declare that it should be owed to the probabilistic nature of the method.