Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 1: Precision Measurements and Metrology I (with A)
Q 1.6: Talk
Monday, February 29, 2016, 12:15–12:30, a310
Enhancing quantum sensing sensitvity and spectral resolution by a quantum memory — •Sebastian Zaiser, Torsten Rendler, Ingmar Jakobi, Samuel Wagner, Philipp Neumann, and Jörg Wrachtrup — 3. Physikalisches Institut, Universität Stuttgart, Deutschland
Measurement of the phase accumulation of a quantum state is central to quantum sensing. Typically, the sensor coherence time (here 400 µ s) limits the timescale for this phase accumulation and hence the energy resolution. Processes occuring on larger timescales can indeed be observed[1]. We employ a small nuclear spin quantum register to store quantum information on timescales of the sensors longitudinal relaxation time (here 5ms). This allows us an increase in frequency resolution by more than one order of magnitude while keeping the full measurement signal. We show that the measurement signal is strongly correlated to the amount of quantum information on the memory qubit by gradually disentangling sensing and memory qubit before the sensing step. We further apply our quantum sensor-memory couple for high resolution NMR spectroscopy of single 13C nuclear spins.
[1] A. Laraoui et al., Nature Communica- tions 4, 1651 (2013), arXiv: 1305.1536