Loic Henriet, head of Quantum Software at Pasqal, has published an original research about the robustness of variational algorithms w/r to dissipative processes such as spontaneous emission. This result is an additional element in favor of NISQ computers towards practical applications.
PASQAL’s co-founders Thierry Lahaye and Antoine Browaeys and their team at IOGS have released a pre-print on recent work demonstrating the trapping of single Rydberg atoms in micron-sized, hollow laser traps (called ‘Bottle-beam traps’).
While atoms in their ground state are already cooled down and trapped in 3D light patterns (optical tweezers), so far the Rydberg atoms were not trapped, which was expected to be ultimately limit for gate fidelities and the available time for coherent dynamics for simulation. Once trapped in the dark region of the trap, using a second set of optical tweezers in 3D, the Rydberg atoms can be kept for hundreds of microseconds, only limited by their lifetime. The teams shows that trapping does not degrade coherent manipulations of the internal state of the atom using microwave, nor the interaction-induced swapping of internal states between two atoms. These results further extend the possibilities offered by Rydberg atoms arrays for quantum computing.
Main components of the experimental setup. The zoom shows two-dimensional cuts of the reconstructed light intensity distribution near the focal plane.