Boosted quantum teleportation

TL;DR

This paper demonstrates a method to surpass the 50% success limit of linear-optical quantum teleportation by generating ancillary photonic states, achieving higher fidelity and success rates, with potential applications in quantum repeaters.

Contribution

The authors introduce a novel scheme that boosts Bell-state measurement success probability beyond the traditional limit in linear optics quantum teleportation.

Findings

Achieved an average teleportation fidelity of 0.8677.

Realized a success rate of approximately 70%.

Demonstrated applicability to quantum repeaters.

Abstract

Quantum teleportation has proven to be fundamental for many quantum information and communication processes. The core concept can be exploited in many tasks, from the transmission of quantum states, quantum repeaters, to quantum computing. However, for linear-optical systems, the efficiency of teleportation is directly linked to the success probability of the involved Bell-state measurement. In most implementations, this is realized by linear optics with an intrinsically limited success probability of 50%. Here, we demonstrate quantum teleportation surpassing this limit. We achieve an average fidelity of the teleported states of $0.8677\pm0.0024$, leading to an overall acceptance rate of the teleportation of $69.71\pm0.75\%$. We obtain this boosted success probability by generating ancillary photonic states that are interfered with the Bell states. Thus, our work demonstrates the boosting Bell-state measurements in quantum-technology applications and our scheme could directly be applied to e.g. quantum repeaters.