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Journal of Yanbian University

Probabilistic Dense Coding with Non-maximally Entangled State in Cavity QED

Shou Zhang

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

We propose a protocol for implementing probabilistic dense coding in cavity QED.The sender and the receiver share the non-maximally entangled quantum channel.We realize quantum dense coding in a simple way by performing unitary transformations on atoms.In the meanwhile,we complete conversion of entangled state from non-maximally entangled state to maximally entangled state.

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•Jan 1, 2009•0 citations
We propose a protocol for implementing probabilistic dense coding in cavity QED.The sender and the receiver share the non-maximally entangled quantum channel.We realize quantum dense coding in a simple way by performing unitary transformations on atoms.In the meanwhile,we complete conversion of entangled state from non-maximally entangled state to maximally entangled state.
In quantum communication, the concept of dense coding traditionally relies on maximally entangled states as quantum channels. Recent advancements have expanded this framework to include non-maximally entangled states within the probabilistic dense coding paradigm. However, such schemes introduce a significant limitation: the receiver cannot always retrieve the complete dense coding information sent by the sender. Consequently, the receiver must inform the sender of the amount of information successfully received. Based on this feedback, the sender determines whether retransmission is necessary, leading to inefficient use of the quantum channel and reduced communication efficiency. To address these shortcomings, we propose an alternative deterministic quantum dense coding scheme that utilizes non-maximally entangled states as the quantum channel. This deterministic approach eliminates the need for retransmissions and significantly enhances communication efficiency while maintaining compatibility with non-maximally entangled states. Our scheme represents a substantial improvement over existing probabilistic methods and paves the way for more efficient quantum communication protocols.
Dense coding of multi-atom entangled states in cavity QED is studied. If the quantum channel is generalized GHZ states, dense coding can be directly realized in a simply way. As for the partially entangled pure states, we propose a feasible protocol for entanglement concentration, and the efficiency of information transmitted is calculated. The schemes are insensitive to the cavity decay and the field state, due to the fact that the interaction here is a large-detuned one between atoms and the cavity.