The possibility to switch the damping rate for a one-electron oscillator is demonstrated for an electron that oscillates along the magnetic field axis in a Penning trap. Strong axial damping can be switched on to allow this oscillation to be used for quantum nondemolition detection of the cyclotron and spin quantum state of the electron. Weak axial damping can be switched on to circumvent the backaction of the detection motion that has limited past measurements. The newly developed switch will reduce the linewidth of the cyclotron transition of one-electron by two orders of magnitude.

中文翻译：

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单粒子振荡器的可切换阻尼

对于在潘宁阱中沿着磁场轴振荡的电子，证明了为单电子振荡器改变阻尼率的可能性。可以启用强轴向阻尼，以允许将此振荡用于回旋加速器的量子非爆破检测和电子的自旋量子态。可以启用弱轴向阻尼，以规避过去的测量受到限制的检测运动的反作用。新开发的开关将使单电子回旋加速器跃迁的线宽减小两个数量级。