Abstract
We report experimental results on the action of selected local environments on the fidelity of the quantum teleportation protocol, taking into account non-ideal, realistic entangled resources. Different working conditions are theoretically identified, where a noisy protocol can be made almost insensitive to further addition of noise. We put to test these conditions on a photonic implementation of the quantum teleportation algorithm, where two polarization entangled qubits act as the entangled resource and a path qubit on Alice encodes the state to be teleported. Bob's path qubit is used to implement a local environment, while the environment on Alice's qubit is simulated as a weighed average of different pure states. We obtain a good agreement with the theoretical predictions, we experimentally recreate the conditions to obtain a noise-induced enhancement of the protocol fidelity, and we identify parameter regions of increased insensibility to interactions with specific noisy environments.
Highlights
In the quantum teleportation algorithm an unknown quantum state is transmitted between two distant parties who share an entangled pair of qubits [1]
Badziag et al [8] presented a class of two-qubit states with f < 1/2 which can be used for teleportation with non-classical fidelity. They showed that dissipative interactions with an environment via an amplitude damping channel can enhance the fidelity of teleportation for a family of non-teleporting mixed entangled states, allowing for teleportation with quantum fidelity
0.6 a we present the expressions for the fully entangled fraction of a two-qubit maximally entangled state that is affected by a phase damping channel on one qubit (b) and an amplitude damping channel on the other qubit (a); 1 fAD(ρ ) = 2 1 +
Summary
In the quantum teleportation algorithm an unknown quantum state is transmitted between two distant parties who share an entangled pair of qubits [1]. Badziag et al [8] presented a class of two-qubit states with f < 1/2 which can be used for teleportation with non-classical fidelity They showed that dissipative interactions with an environment via an amplitude damping channel can enhance the fidelity of teleportation for a family of non-teleporting mixed entangled states, allowing for teleportation with quantum fidelity. Bandyopadhyay [9] later analyzed the action of the amplitude damping channel for bipartite maximally entangled states (the four Bell states) where the qubits of the entangled pair undergo local interactions with their respective environments. In [10] it was shown that an enhancement in teleportation fidelity via dissipative interactions with the local environment can be achieved for two-qubit teleportation using a family of four-qubit mixed states as a resource.
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