Quantum information processing with single spins in diamond

Donnerstag, 28. Februar, 13:00 Uhr, H 0105

Quantum computers promise to increase substantially the efficiency of solving certain computationally demanding problems like searching databases and factoring large integers. One of the greatest challenges now is to implement basic quantum computational elements in a physical system and to demonstrate that they can be reliably controlled. Single spins in semiconductors, in particular associated with defect centers, are promising candidates for practical and scalable implementation of quantum computing even at room temperature. This presentation reports an implementation of quantum logic elements with single spins in a solid. As quantum bits a single electron spin and a single 13C nuclear spin of a single nitrogen vacancy defect center in diamond are used. Owing to long decoherence and relaxation times the systems meets the requirements of hardware for quantum computation. Another important application of single spin manipulation is of more fundamental character. Experiments with single spins are suitable for experimental test of quantum mechanics. Projective measurements of single spins can be used as a test of the quantum Zeno effect and Bell’s inequalities.

Fedor Jelezko
University of Stuttgart, 3. Physical Institute, Stuttgart