Compression of Entanglement Improves Quantum Communication
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866909498148388864 |
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| author | Guo, Yu Tang, Hao Pauwels, Jef Cruzeiro, Emmanuel Zambrini Hu, Xiao-Min Liu, Bi-Heng Huang, Yu-Feng Li, Chuan-Feng Guo, Guang-Can Tavakoli, Armin |
| author_facet | Guo, Yu Tang, Hao Pauwels, Jef Cruzeiro, Emmanuel Zambrini Hu, Xiao-Min Liu, Bi-Heng Huang, Yu-Feng Li, Chuan-Feng Guo, Guang-Can Tavakoli, Armin |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_13495 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Compression of Entanglement Improves Quantum Communication Guo, Yu Tang, Hao Pauwels, Jef Cruzeiro, Emmanuel Zambrini Hu, Xiao-Min Liu, Bi-Heng Huang, Yu-Feng Li, Chuan-Feng Guo, Guang-Can Tavakoli, Armin Quantum Physics 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. |
| title | Compression of Entanglement Improves Quantum Communication |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2306.13495 |