Demonstrating Entanglement-Enhanced Communication over Noisy Communication Channels

Charles H. Bennett, Christopher A. Fuchs, John A. Smolin

H. T. Williams, Paul Bourdon

We present a formal quantum mechanical analysis of the communication protocol of Prevedel {\it et al.}\ [Phys. Rev. Lett. \textbf{106}, 110505 (2011)], in which entanglement shared by sender and receiver is used to enhance, beyond that achievable via the optimal classical strategy, the probability of successful transmission of a bit through a particular noisy classical channel ${\cal N}$. We provide a full analysis of this protocol when the shared entanglement resides in a two-qubit system. Our analysis shows the measurement choices specified by the protocol yield the maximum possible enhancement of the probability of successful communication of the bit with one use of the channel ${\cal N}$. We determine that shared entanglement residing in a two-qudit system with $d > 2$ cannot provide enhancement beyond that produced by entangled qubits. Finally, we show how the protocol should be extended when probability parameters for the channel ${\cal N}$ are allowed to vary.

Robert Prevedel, Lu Yang, William Matthews +2 more

In this talk we describe an example of such an entanglement-enhanced classical communication protocol that, compared to the example given in, exhibits a larger absolute gap in the assisted and unassisted success probabilities, involves a much simpler classical channel, a smaller entangled state and, most significantly, is experimentally feasible. We perform an experimental implementation which clearly demonstrates the advantage gained from using entanglement.

Michail A. Zak

Zheshen Zhang, Shuhong Hao, Haowei Shi +2 more

Haowei Shi, Zheshen Zhang, Quntao Zhuang

We report structured encoding and decoding schemes for entanglement-assisted classical communication in a lossy and noisy scenario. Phase encoding on the entangled two-mode squeezed vacuum is shown to be optimal and practical receivers are analyzed.