Compression of Entanglement Improves Quantum Communication

• URL: http://arxiv.org/abs/2306.13495v3
• Date: Tue, 18 Feb 2025 08:07:40 GMT
• Title: Compression of Entanglement Improves Quantum Communication
• Abstract summary: Shared entanglement can amplify classical correlations between systems interacting over a limited quantum channel.<n>We demonstrate a distributed task based on a qubit channel, for which irreversible encoding operations can outperform any possible coherence-preserving protocol.<n>We report on a proof-of-principle experiment that achieves the advantage by realizing separate systems in distinct and independently controlled paths of a single photon.
• Score: 11.666068806010507
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Shared entanglement can significantly amplify classical correlations between systems interacting over a limited quantum channel. A natural avenue is to use entanglement of the same dimension as the channel because this allows for unitary encodings, which preserve global coherence until a measurement is performed. Contrasting this, we here demonstrate a distributed task based on a qubit channel, for which irreversible encoding operations can outperform any possible coherence-preserving protocol. This corresponds to using high-dimensional entanglement and encoding information by compressing one of the subsystems into a qubit. Demonstrating this phenomenon requires the preparation of a four-dimensional maximally entangled state, the compression of two qubits into one and joint qubit-ququart entangled measurements, with all modules executed at near-optimal fidelity. We report on a proof-of-principle experiment that achieves the advantage by realizing separate systems in distinct and independently controlled paths of a single photon. Our result demonstrates the relevance of high-dimensional entanglement and non-unitary operations for enhancing the communication capabilities of standard qubit transmissions.

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