A dispersive nanoSQUID magnetometer for ultra-low noise, high bandwidth flux detection
| Autor: | N. Antler, Irfan Siddiqi, R. Vijay, Eli Levenson-Falk |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Josephson effect
Magnetometer FOS: Physical sciences 02 engineering and technology Low frequency 7. Clean energy 01 natural sciences law.invention Superconductivity (cond-mat.supr-con) law Transmission line Condensed Matter::Superconductivity 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Materials Chemistry Electrical and Electronic Engineering 010306 general physics Physics Condensed Matter - Mesoscale and Nanoscale Physics business.industry Amplifier Condensed Matter - Superconductivity Bandwidth (signal processing) Metals and Alloys 021001 nanoscience & nanotechnology Condensed Matter Physics Ceramics and Composites Optoelectronics Parametric oscillator 0210 nano-technology business Microwave |
| DOI: | 10.48550/arxiv.1301.3184 |
| Popis: | We describe a dispersive nanoSQUID magnetometer comprised of two variable thickness aluminum weak-link Josephson junctions shunted in parallel with an on-chip capacitor. This arrangement forms a nonlinear oscillator with a tunable 4-8 GHz resonant frequency with a quality factor Q = 30 when coupled directly to a 50 $\Omega$ transmission line. In the presence of a near-resonant microwave carrier signal, a low frequency flux input generates sidebands that are readily detected using microwave reflectometry. If the carrier excitation is sufficiently strong then the magnetometer also exhibits parametric gain, resulting in a minimum effective flux noise of 30 n$\Phi_0$/Hz$^{1/2}$ with 20 MHz of instantaneous bandwidth. If the magnetometer is followed with a near quantum-noise-limited Josephson parametric amplifier, we can increase the bandwidth to 60 MHz without compromising sensitivity. This combination of high sensitivity and wide bandwidth with no on-chip dissipation makes this device ideal for local sensing of spin dynamics, both classical and quantum. Comment: 5 pages, 4 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|