Ultrasensitive magnetic field detection using a single artificial atom

被引:65
作者
Bal, M. [1 ,2 ]
Deng, C. [1 ,2 ]
Orgiazzi, J. -L. [2 ,3 ]
Ong, F. R. [1 ,2 ]
Lupascu, A. [1 ,2 ]
机构
[1] Univ Waterloo, Dept Phys & Astron, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada
[2] Univ Waterloo, Waterloo Inst Nanotechnol, Waterloo, ON N2L 3G1, Canada
[3] Univ Waterloo, Dept Elect & Comp Engn, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada
来源
NATURE COMMUNICATIONS | 2012年 / 3卷
基金
加拿大自然科学与工程研究理事会; 加拿大创新基金会;
关键词
CIRCUIT QUANTUM ELECTRODYNAMICS; FLUX QUBIT; DC-SQUID; NOISE; MAGNETOMETRY; DIAMOND; AMPLIFICATION; SPIN;
D O I
10.1038/ncomms2332
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Efficient detection of magnetic fields is central to many areas of research and technology. High-sensitivity detectors are commonly built using direct-current superconducting quantum interference devices or atomic systems. Here we use a single artificial atom to implement an ultrasensitive magnetometer with micron range size. The artificial atom, a superconducting two-level system, is operated similarly to atom and diamond nitrogen-vacancy centre-based magnetometers. The high sensitivity results from quantum coherence combined with strong coupling to magnetic field. We obtain a sensitivity of 3.3 pT Hz(-1/2) for a frequency of 10 MHz. We discuss feasible improvements to increase sensitivity by one order of magnitude. The intrinsic sensitivity of this detector at frequencies in the 100 kHz-10MHz range compares favourably with direct-current superconducting quantum interference devices and atomic magnetometers of equivalent spatial resolution. This result illustrates the potential of artificial quantum systems for sensitive detection and related applications.
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页数:8
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