Projekteja vuodessa
Abstrakti
Carrier noise in coherent tones limits sensitivity and causes heating in many experimental systems, such as force sensors, time-keeping, and
studies of macroscopic quantum phenomena. Much progress has been made to reduce carrier noise using phase noise cancellation techniques;
however, in systems where amplitude noise dominates, these methods are ineffective. Here, we present a technique to reduce amplitude noise
from microwave generators using feedback cancellation. The method uses a field-programmable gate array (FPGA) to reproduce noise with
a tunable gain and time delay, resulting in destructive interference when combined with the original tone. In addition, the FPGA allows for
tuning of the frequency offset and bandwidth in which the noise is canceled. By employing the cancellation, we observe 13 dB of noise power
reduction at a 2 MHz offset from a 4 GHz microwave tone, lowering the total noise to the phase noise level. To verify its applicability, we
utilize the setup in a microwave optomechanics experiment to investigate the effect of generator noise on the sideband cooling of a 0.5 mm
silicon nitride membrane resonator. We observe that with our technique, the rate of externally induced cavity heating is reduced by a factor of
3.5 and the minimum oscillator occupation is lowered by a factor of 2. This method broadens the field of noise cancellation techniques, where
amplitude noise is becoming an increasingly important consideration in microwave systems as phase noise performances improve over time.
studies of macroscopic quantum phenomena. Much progress has been made to reduce carrier noise using phase noise cancellation techniques;
however, in systems where amplitude noise dominates, these methods are ineffective. Here, we present a technique to reduce amplitude noise
from microwave generators using feedback cancellation. The method uses a field-programmable gate array (FPGA) to reproduce noise with
a tunable gain and time delay, resulting in destructive interference when combined with the original tone. In addition, the FPGA allows for
tuning of the frequency offset and bandwidth in which the noise is canceled. By employing the cancellation, we observe 13 dB of noise power
reduction at a 2 MHz offset from a 4 GHz microwave tone, lowering the total noise to the phase noise level. To verify its applicability, we
utilize the setup in a microwave optomechanics experiment to investigate the effect of generator noise on the sideband cooling of a 0.5 mm
silicon nitride membrane resonator. We observe that with our technique, the rate of externally induced cavity heating is reduced by a factor of
3.5 and the minimum oscillator occupation is lowered by a factor of 2. This method broadens the field of noise cancellation techniques, where
amplitude noise is becoming an increasingly important consideration in microwave systems as phase noise performances improve over time.
| Alkuperäiskieli | Englanti |
|---|---|
| Artikkeli | 084705 |
| Sivut | 1-8 |
| Sivumäärä | 8 |
| Julkaisu | Review of Scientific Instruments |
| Vuosikerta | 96 |
| Numero | 8 |
| DOI - pysyväislinkit | |
| Tila | Julkaistu - 28 elok. 2025 |
| OKM-julkaisutyyppi | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä |
Rahoitus
We acknowledge the facilities and technical support from Otaniemi research infrastructure for Micro and Nanotechnologies (OtaNano). This work was supported by the Research Council of Finland (Contract No. 352189) and by the European Research Council (Contract No. 101019712). This work was performed as part of the Research Council of Finland Centre of Excellence program (Contract Nos. 352932 and 336810). We acknowledge funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 824109, the European Microkelvin Platform (EMP), and the QuantERA II Programme (Contract No. 13352189). This work has received funding from the European Union’s Research and Innovation Programme, Horizon Europe, under the Marie Skłodowska-Curie Grant Agreement No. 101198933 (mGramm). Y.L. acknowledges funding from the Beijing Municipal Science and Technology Commission (Grant No. Z221100002722011).
Sormenjälki
Sukella tutkimusaiheisiin 'Amplitude noise cancellation of microwave tones'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.-
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