CoE-QuICST and Qmet Tech Foundation invites you to
An International Year of Quantum Science and Technology Event
Talk and Interactive Fireside Chat Session
With
Prof. David DiVincenzo
Director of the Institute of Theoretical Nanoelectronics at the Peter Grünberg Institute at the Forschungszentrum Jülich,
Professor at the Institute for Quantum Information at RWTH Aachen University
Talk followed by a Fireside Chat session
28th Feb, 2025 from 16:00
Title: Quantum cryptography with ultra-short microwave pulses
Abstract:
Suppose a short pulse is launched into a transmission line by a classical instrument -- one with a defined profile of the field strength, i.e., the electric field or voltage V(t), at the transmission point. How does this turn into a precise description of the arrival profile and quantum numbers of the photons in the pulse? I discuss that there is a highly nontrivial mathematical relation between the function V(t) and the arrival function of the photons. Paradoxically, when V(t) is strictly limited in time, the photon arrival profile cannot be. This, and the counterintuitive relation between V(t) and the expected number of arriving photons, has consequences for the security of quantum cryptography with ultrashort pulses.
Speaker
BIOGRAPHY:
David DiVincenzo is the director of the Institute of Theoretical Nanoelectronics at the Peter Grünberg Institute at the Forschungszentrum Jülich and professor at the Institute for Quantum Information at RWTH Aachen University. With Daniel Loss (at the University of Basel), he proposed the Loss–DiVincenzo quantum computer in 1997, which would use electron spins in quantum dots as qubits
Venue: VMCC 32, IIT Bombay
