QUROPE Quantum Information Processing and Communication in Europe

In a recent publication in Nature, the group led by Leo DiCarlo at SOLID partner TU-Delft have performed a time-resolved, continuous parity measurement of two superconducting qubits using the cavity in a three-dimensional circuit quantum electrodynamics architecture and phase-sensitive parametric amplification. Using postselection, the group managed to produce entanglement by parity measurement reaching 88 per cent fidelity to the closest Bell state.

In a recent publication in Nature Nanotechnology, the group led by Jörg Wrachtrup experimentally demonstrated entanglement between two engineered single solid-state spin quantum bits (qubits) at ambient conditions. Photon emission of defect pairs reveals ground-state spin correlation. Entanglement (fidelity = 0.67±0.04) was proved by quantum state tomography.

 From 2014, Wallraff will be using the funds awarded to him by the Advanced Grant to investigate ways of developing networks for computers that operate on the basis of quantum physics: quantum computers. The technology is based on integrated electronic circuits that use superconductive materials, and in which information is processed at microwave frequencies. The project focuses on the development of networks that can connect individual quantum chips at distances ranging from a few centimeters to several meters.

The team led by R.

Scientists from Delft University of Technology and the FOM Foundation have successfully allowed electrons to jump between quantum dots located far from each other. The electron jumped between the ends of a chain of three small semiconducting islands (so-called quantum dots) without crossing the island in the middle.

For more information, navigate to http://dicarlolab.tudelft.nl/entangling-quantum-circuits-by-measurement/