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HL: Fachverband Halbleiterphysik

HL 38: Focused Session: Different realizations of quantum registers

HL 38.2: Topical Talk

Donnerstag, 26. März 2009, 10:00–10:30, HSZ 01

Quantum Information processing in diamond — •Fedor Jelezko and Jörg Wrachtrup — 3. Physcal Instutute, University of Stuttgart

Quantum Information processing in diamond Solid state quantum information processing often requires important breakthrough in material science. While classical semiconductor materials have had several decades of development with respect to purity and structure, carbon based materials are a relatively new class of substances to this field. Research on carbon systems, like, fullerenes, nanotubes, graphene or recently diamond is often driven by the requirements of having a spin-free lattice. In this talk we will focus on exceptional optical and spin properties associated with single color centers. Such optically active defects have been identified as a prominent candidate for quantum information processing and quantum cryptography a few years ago, but technology for controlling single spins was developed only recently. Here we show that being placed in a spin free lattice, single electron spins show the longest room temperature spin dephasing times ever observed in solid state systems. This benchmark will potentially allow observation of coherent coupling between spins separated by a few tens of nanometres, making it a versatile material for room temperature quantum information processing devices. We also show that single electron spins can be used to detect external magnetic fields with a sensitivity reaching nanotesla and sub-nanometre spatial resolution. References: Balasubramanian et al. Nature 455, 648-651 (2008), Neumann, et al. Science 320, 1326-1329 (2008).