Heidelberg 2015 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 6: Posters
MS 6.2: Poster
Dienstag, 24. März 2015, 17:00–19:00, C/Foyer
Room-temperature ultrasensitive mass spectrometer via dynamical decoupling — •Nan Zhao1 and Zhang-qi Yin2 — 1Beijing Computational Science Research Center — 2The Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University
We propose an ultrasensitive mass spectrometer based on a coupled quantum-bit-oscillator system. Under dynamical decoupling control of the quantum bit (qubit), the qubit coherence exhibits a comb structure in the time domain. The time-comb structure enables high-precision measurements of oscillator frequency, which can be used as an ultra sensitive mass spectrometer. We show that, in the ideal case, the sensitivity of the proposed mass spectrometer has better performance at higher temperature and scales with the temperature T as η ∼ T1/2. While taking into account qubit and oscillator decay, the optimal sensitivity reaches a universal value independent of environmental temperature T . The measurement sensitivity also shows an improved dependence on the control-pulse number N as η ∼ N3/2, in comparison with the N1/2 scaling in previous magnetometry studies. With the present technology on solid-state spin qubit and high-quality optomechanical system, our proposal is feasible to realize an ultrasensitive room-temperature mass spectrometer.