@article{GabrielWittmannSychetal., author = {Gabriel, Christian and Wittmann, Christoffer and Sych, Denis and Dong, Ruifang and Mauerer, Wolfgang and Andersen, Ulrik L. and Marquardt, Christoph and Leuchs, Gerd}, title = {A generator for unique quantum random numbers based on vacuum states}, series = {Nature Photonics}, volume = {4}, journal = {Nature Photonics}, number = {10}, publisher = {Springer}, organization = {Springer}, doi = {10.1038/nphoton.2010.197}, pages = {711 -- 715}, abstract = {Random numbers are a valuable component in diverse applications that range from simulations over gambling to cryptography. The quest for true randomness in these applications has engendered a large variety of different proposals for producing random numbers based on the foundational unpredictability of quantum mechanics4,5,6,7,8,9,10,11. However, most approaches do not consider that a potential adversary could have knowledge about the generated numbers, so the numbers are not verifiably random and unique12,13,14,15. Here we present a simple experimental setup based on homodyne measurements that uses the purity of a continuous-variable quantum vacuum state to generate unique random numbers. We use the intrinsic randomness in measuring the quadratures of a mode in the lowest energy vacuum state, which cannot be correlated to any other state. The simplicity of our source, combined with its verifiably unique randomness, are important attributes for achieving high-reliability, high-speed and low-cost quantum random number generators.}, language = {en} } @inproceedings{GabrielWittmannHackeretal., author = {Gabriel, Christian and Wittmann, Ch. and Hacker, B. and Mauerer, Wolfgang and Huntington, E. and Sabuncu, M. and Marquardt, Ch. and Leuchs, G.}, title = {A high-speed secure quantum random number generator based on vacuum states}, series = {IEEE/OSA Conference on Lasers and Electro-Optics (CLEO), 06-11 May 2012, San Jose CA USA}, booktitle = {IEEE/OSA Conference on Lasers and Electro-Optics (CLEO), 06-11 May 2012, San Jose CA USA}, publisher = {Optical Society of America}, abstract = {A high-speed continuous-variable quantum random bit generator with an expected effective bit generation rate of up to 10 GBit/s is presented. The obtained bit sequences are truly random and unique, i.e. they cannot be known by an adversary.}, language = {en} }