共 41 条
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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