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Theoretical challenges in continuous-variable quantum cryptography

Anthony Leverrier

Sep 18, 20170 citations

Continuous-variable quantum cryptography using two-way quantum communication

Stefano Pirandola, Stefano Mancini, Seth Lloyd +1 more

arXiv:quant-ph/0611167Nature PhysicsJul 11, 2008269 citations

Teleportation-based continuous variable quantum cryptography

F. S. Luiz, Gustavo Rigolin

arXiv:1408.5012Quantum Information ProcessingJan 21, 20177 citations

Continuous-variable quantum computing and its applications to cryptography

Koji Nagata, Do Ngoc Diep, Ahmed Farouk +1 more

Institute of Physics eBooksJul 1, 20220 citations

Entanglement Swapping between Discrete and Continuous Variables

Shuntaro Takeda, Maria Fuwa, Peter van Loock +1 more

We experimentally realize "hybrid" entanglement swapping between discrete-variable (DV) and continuous-variable (CV) optical systems. DV two-mode entanglement as obtainable from a single photon split at a beam splitter is robustly transferred by means of efficient CV entanglement and operations, using sources of squeezed light and homodyne detections. The DV entanglement after the swapping is verified without postselection by the logarithmic negativity of up to 0.28±0.01. Furthermore, our analysis shows that the optimally transferred state can be postselected into a highly entangled state that violates a Clauser-Horne-Shimony-Holt inequality by more than 4 standard deviations, and thus it may serve as a resource for quantum teleportation and quantum cryptography.We experimentally realize "hybrid" entanglement swapping between discrete-variable (DV) and continuous-variable (CV) optical systems. DV two-mode entanglement as obtainable from a single photon split at a beam splitter is robustly transferred by means of efficient CV entanglement and operations, using sources of squeezed light and homodyne detections. The DV entanglement after the swapping is verified without postselection by the logarithmic negativity of up to 0.28±0.01. Furthermore, our analysis shows that the optimally transferred state can be postselected into a highly entangled state that violates a Clauser-Horne-Shimony-Holt inequality by more than 4 standard deviations, and thus it may serve as a resource for quantum teleportation and quantum cryptography.

arXiv:1411.1310Physical Review LettersMar 9, 2015124 citations

Secure Quantum Key Distribution using Continuous Variables of Single Photons

Lijian Zhang, Christine Silberhorn, Ian A. Walmsley

We analyze the distribution of secure keys using quantum cryptography based on the continuous variable degree of freedom of entangled photon pairs. We derive the information capacity of a scheme based on the spatial entanglement of photons from a realistic source, and show that the standard measures of security known for quadrature-based continuous variable quantum cryptography (CV-QKD) are inadequate. A specific simple eavesdropping attack is analyzed to illuminate how secret information may be distilled well beyond the bounds of the usual CV-QKD measures.We analyze the distribution of secure keys using quantum cryptography based on the continuous variable degree of freedom of entangled photon pairs. We derive the information capacity of a scheme based on the spatial entanglement of photons from a realistic source, and show that the standard measures of security known for quadrature-based continuous variable quantum cryptography (CV-QKD) are inadequate. A specific simple eavesdropping attack is analyzed to illuminate how secret information may be distilled well beyond the bounds of the usual CV-QKD measures.

arXiv:0711.4631Physical Review LettersMar 18, 200895 citations

Continuous variable systems: Entanglement, decoherence and quantum cryptography

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