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QI: Fachverband Quanteninformation

QI 26: Quantum Communication I: Theory

QI 26.1: Hauptvortrag

Donnerstag, 13. März 2025, 11:00–11:30, HS IX

Device-independent randomness amplification — •Ramona Wolf — Universität Siegen

Randomness is a regular part of our (more or less) daily lives: from drawing lottery numbers to running computer simulations and the security of cryptographic schemes, various applications rely on random numbers. But does true randomness actually exist? If so, can we create truly random numbers in our labs? Conventional random number generators based on classical physical processes face a fundamental problem, namely the possibility that attackers can predict their results by examining the microscopic degrees of freedom, thereby eroding their fundamental unpredictability. Fortunately, quantum physics exhibits intrinsic randomness, which opens up the possibility of creating perfect randomness from an imperfect and even publicly accessible source. However, its practical realisation relies on the successful execution of a Bell test with sufficiently high Bell violation and repetition rate, making it a challenging endeavour.

In this talk, I will discuss what is necessary to realize quantum random number generators, starting with how to properly define randomness (which is a surprisingly nontrivial task!) up to explaining how to design protocols for experimentally generating truly random numbers, and reporting on recent experimental progress.

Keywords: Quantum random number generation; Quantum communication; Device-independence