The Correlation Conversion Property of Quantum Channels

Gyöngyösi, László (2014) The Correlation Conversion Property of Quantum Channels. QUANTUM INFORMATION PROCESSING, 13 (2). pp. 467-473. ISSN 1570-0755

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Abstract

Transmission of quantum entanglement will play a crucial role in future networks and long- distance quantum communications. Quantum Key Distribution, the working mechanism of quantum repeaters and the various quantum communication protocols are all based on quan- tum entanglement. On the other hand, quantum entanglement is extremely fragile and sensi- tive to the noise of the communication channel over which it has been transmitted. To share entanglement between distant points, high fidelity quantum channels are needed. In practice, these communication links are noisy, which makes it impossible or extremely difficult and ex- pensive to distribute entanglement. In this work we first show that quantum entanglement can be generated by a new idea, exploiting the most natural effect of the communication channels: the noise itself of the link. We prove that the noise transformation of quantum channels that are not able to transmit quantum entanglement can be used to generate distil- lable (useable) entanglement from classically correlated input. We call this new phenomenon the Correlation Conversion property (CC-property) of quantum channels. The proposed solu- tion does not require any non-local operation or local measurement by the parties, only the use of standard quantum channels. Our results have implications and consequences for the future of quantum communications, and for global-scale quantum communication networks. The discovery also revealed that entanglement generation by local operations is possible.

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