kosm

A Simulation Environment for QKD Systems and Co-Existing Classical Channels

6 October 2021, 11:00 AM – 12:00 PM

Recently VPIphotonics developed a new simulation tool, VPItoolkit™ QKD. When used together with VPItransmissionMaker Optical Systems, a simulation environment for classical transmission systems, they represent a powerful R&D environment for the development of QKD systems based on weak-coherent prepare-and-measure protocols, including co-existence scenarios with classical channels. The design environment can serve as a test bed for the development and evaluation of various implementation options of QKD systems and sub-systems, such as pulse shaping, signal recovery and filtering, and others. The toolkit offers capabilities for modeling a wide range of component imperfections by inheriting the versatile numerical approach of VPItransmissionMaker™ Optical Systems (part of VPIphotonics Design Suite™), including thermal noise, ADC quantization noise, RIN, phase noise, dark count rates, afterpulsing, dead time, etc. Also, exploiting the powerful model libraries coming with VPItransmissionMaker™ Optical Systems, the toolkit allows the investigation of various deteriorate effects such as Raman scattering and crosstalk from classical channels in co-existence scenarios. The native sweep and scripting functionality offers a convenient way to optimize simulation parameters such as modulation amplitude, photons per pulse, filter bandwidth, BB84 basis probability, symbol rate, and others. In the webinar we discuss modules for both CV- and DV-QKD including transmitters and receivers, parameter estimation, and secret key rate calculation and show live demos of various application examples.

Info on agenda here.

Posted by kosm in News

Results from the QT Flagship project UNIQORN

Title

Results from the QT Flagship project UNIQORN

Authors

H. Hübel

Abstract

 

Venue

EQTC 2021, virtual Conference, Nov. 2021, p. 246

Posted by kosm in scientific publications

Probabilistic one-time programs using quantum entanglement

Title

Probabilistic one-time programs using quantum entanglement

Authors

Marie-Christine Roehsner, Joshua A. Kettlewell, Joseph Fitzsimons & Philip Walther

Abstract

Probabilistic one-time programs harness these capabilities for quantum-assisted classical computations by encoding classical software in small quantum states resulting in computer programs that can be used only once. Such self-destructing one-time programs facilitate a variety of applications reaching from software distribution to one-time delegation of signature authority. Whereas previous experiments demonstrated the feasibility of such schemes, the practical applications were limited. Here we present an improved protocol for one-time programs that resolves major drawbacks of previous schemes, by employing entangled qubit pairs. This results in four orders of magnitude higher count rates and the ability to execute a program long after the quantum information exchange has taken place. We implement a one-time delegation of signature authority over an underground fiber link between university buildings in downtown Vienna, emphasizing the compatibility of our scheme with prepare-and-measure quantum internet networks.

Venue

Nature, NPJ Quantum Information

[Download]

Posted by kosm in project deliverables

VPIphotonics releases a new version of its simulation environment for classical and quantum communications

VPIphotonics announces a new release of its simulation and design tools VPIphotonics Design Suite™ 11.1 and VPItoolkit™ QKD 1.7. When used together, they represent a powerful R&D environment for the development of QKD systems based on weak-coherent prepare-and-measure protocols, including co-existence scenarios with classical channels. VPItoolkit™ QKD provides modules for both CV- and DV-QKD including transmitters and receivers, parameter estimation, and secret key rate calculation. The design environment can serve as a test bed for the development and evaluation of various implementation options of QKD systems and sub-systems, such as pulse shaping, signal recovery and filtering, and others. The toolkit offers capabilities for modeling a wide range of component imperfections by inheriting the versatile numerical approach of VPItransmissionMaker™ Optical Systems (part of VPIphotonics Design Suite™), including thermal noise, ADC quantization noise, RIN, phase noise, dark count rates, afterpulsing, dead time, etc. Also, exploiting the powerful model libraries coming with  VPItransmissionMaker™ Optical Systems, the toolkit allows to investigate various deteriorate effects such as Raman scattering and cross-talk from classical channels in co-existence scenarios. The in-build sweep and scripting functionality offers a convenient way to optimize simulation parameters such as modulation amplitude, photons per pulse, filter bandwidth, BB84 basis probability, symbol rate, and others. In summary, VPIphotonics Design Suite™ and VPItoolkit™ QKD are valuable design and optimization tools for researchers and engineers working in the area of quantum communications. The foundations for VPItoolkit™ QKD 1.7 have been laid in the Quantum Flagship project UNIQORN.

Links:
https://www.vpiphotonics.com/Tools/QKD/
https://www.vpiphotonics.com/Tools/OpticalSystems/

Posted by kosm in News, project deliverables