Microwave Phase Detection at the Level of $10^{-11}$ rad

Abstract

We report on a noise measurement system with the highest spectral resolution ever achieved in the microwave domain. It is capable of detecting the phase fluctuations of $rms$ amplitude of $2\times 10^{-11}rad/\sqrt{Hz}$ at Fourier frequencies above few $kHz$. Such precision allows the study of intrinsic fluctuations in various microwave components and materials, as well as precise tests of fundamental physics. Employing this system we discovered a previously unknown phenomenon of down-conversion of pump oscillator phase noise into the low-frequency voltage fluctuations.

Accepted for publication in Review of Scientific Instruments

References in corpus (5)

• Cosmological Constraints on Lorentz Violation in Electrodynamics
• Lorentz-Violating Electrostatics and Magnetostatics
• Test of Lorentz Invariance in Electrodynamics Using Rotating Cryogenic Sapphire Microwave Oscillators
• New methods of testing Lorentz violation in electrodynamics
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• Noise Suppression with Cryogenic Resonators
• Precision Measurement of a low-loss Cylindrical Dumbbell-Shaped Sapphire Mechanical Oscillator using Radiation Pressure
• Microwave Cavity Mode Optimisation by Background Anti-Resonance Tuning
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