Periodic Reporting for period 1 - ROSETTA (Robust self-testing with applications to device-independent cryptography)
Reporting period: 2017-03-01 to 2019-02-28
The overarching goal of our research is to provide procedures that allow us to certify any quantum device that might be useful from the practical point of view. In particular, this includes highly complex devices consisting of many qubits (qubit is the quantum equivalent of a bit, a classical unit of information/memory) as well as devices correlated with multiple other devices.
Our procedures have already been used to certify quantum devices and we are actively encouraging experimental groups to take advantage of them. This will allow them to improve the design and manufacturing process which in the long-term will speed up the development of powerful and useful quantum devices. Once these are available we can use them to build a quantum computer (superior computational power) or connect them in a network (the ""quantum internet"") to provide safer and more efficient communication."
The second project was a big international collaboration with researchers from Canada, Hungary, Taiwan and Singapore. We posed many important and fundamental questions about the nature of quantum correlations and answered them. The results were published in Physical Review A.
The next two projects resulted from a fruitful collaboration with the Group of Applied Physics at the University of Geneva. We have realised that some techniques developed previously can be applied to new scenarios. In particular, we have developed a procedure for certifying states and measurements in the prepare-and-measure scenario (related to the so-called ""quantum random access codes"") and a procedure for certifying entangled measurements in the bilocality scenario (two independent quantum sources). The results are available at an online repository (the arXiv) and are currently under review.
The last project was a collaboration with Institute for Photonic Sciences (Barcelona, Spain) and Center for Theoretical Physics (Warsaw, Poland). We have provided a procedure to certify the maximally entangled state of two qutrits and a particular type of important quantum measurements acting on it (three ""mutually unbiased bases""). We are currently working on generalising this approach to higher-dimensional systems. The results are available at an online repository (the arXiv) and will be submitted to a journal soon."