2015/03/05 by Curtis J. Broadbent, K. C. Marshall, Broadbent, Curtis J. +5 · 1 citation
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Quantum Information and Cryptography #Quantum Physics (quant-ph) #Quantum and electron transport phenomena #Quantum-Dot Cellular Automata
paper · pdf · doi:10.48550/arxiv.1503.01688
openalex publication_date 2015/03/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We show how weak non-linearities can be used in a device-independent quantum\nkey distribution (QKD) protocol using generalized two-mode Schr "odinger cat\nstates. The QKD protocol is therefore shown to be secure against collective\nattacks and for some coherent attacks. We derive analytical formulas for the\noptimal values of the Bell parameter, the quantum bit error rate, and the\ndevice-independent secret key rate in the noiseless lossy bosonic channel.\nAdditionally, we give the filters and measurements which achieve these optimal\nvalues. We find that over any distance in this channel the quantum bit error\nrate is identically zero, in principle, and the states in the protocol are\nalways able to violate a Bell inequality. The protocol is found to be superior\nin some regimes to a device-independent QKD protocol based on polarization\nentangled states in a depolarizing channel. Finally, we propose an\nimplementation for the optimal filters and measurements.\n