Regensburg 2010 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 8: Quantum Dynamics, Decoherence, and Quantum Information I
DY 8.4: Talk
Tuesday, March 23, 2010, 10:45–11:00, H38
Quantum non demolition measurement of a single nuclear spin in a room temperature solid — Phillip Neumann1, Johannes Beck1, Matthias Steiner1, Helmut Rathgen1, •Florian Rempp1, Navid Zarrabi1, Florian Dolde1, Philip Hemmer2, Fedor Jelezko1, and Jörg Wrachtrup1 — 1Universität Stuttgart, Deutschland — 2A&M University,Texas
The measurement process and its interpretation are in the focus of quantum mechanics since its early days. Today's ability to isolate single quantum objects allows experimental demonstration of former "gedankenexperiments" like measurement induced quantum state collaps. Rapidly growing quantum technologies explore fundamental aspects of measurements in quantum computing, however for solid state systems such experiments require operation at very low temperatures. Here we show that projective quantum measurement can be performed on a single nuclear spin in diamond under ambient conditions. Using quantum non demolition (QND) readout we are able to detect quantum jumps and the quantum Zeno effect emphasising the addressability of fundamental questions of quantum mechanics in solids. Single shot measurements with fidelities exceeding 0.9 enable efficient state initialization, quantum error correction and entanglement pumping that is crucial for quantum information processing including measurement based schemes and distributed quantum networks.