ハイブリッド系におけるスピン量子ビットとナノメカニカル共振器を用いた光増幅と質量センシング

Highly sensitive mass sensors are pivotal for precision measurements but face critical challenges, necessitating innovative designs and approaches. In this study, we propose a tunable optical mass sensor based on a hybrid system consisting of a spin qubit and a nanomechanical resonator (NR). The results show that pump field frequency adjustment switches the four-wave mixing (FWM) spectrum between four/five-peaked structures, with two sharp sidebands aligned to the NR's resonance frequency. Near the bistable threshold, pump intensity tuning amplifies the FWM signal by up to 7.53 × 10⁴ times (200 kHz vs. 1 kHz spin-NR coupling). Detecting NR resonance frequency shifts induced by tiny adsorbed analytes (e.g., Escherichia coli, influenza viruses, and HIV virions), the sensor achieves a frequency resolution of 2.52 Hz and a mass resolution of 9.03 fg at 300 K (thermal noise included). These findings provide a fascinating route for high-performance on-chip sensors and advance precision measurement.