6 papers · 1 filter
A Quantum-Enhanced Feedback Oscillator
Hudson A. Loughlin, Daniel M. DeSantis, Nergis Mavalvala +1
Feedback oscillators, such as lasers and masers, serve as time references in modern computing, communication, and measurement. Quantum fluctuations ultimately limit their phase sta…
Noise-Resilient Quantum Metrology
Hudson A. Loughlin, Melissa A. Guidry, Jacques Ding +7
Quantum metrology seeks to leverage the richness of quantum systems for making better measurements than are possible using only classical resources in order to gain a ``quantum adv…
Wave-particle duality in the measurement of gravitational radiation
Hudson A. Loughlin, Germain Tobar, Evan D. Hall +1
In a consistent description of the quantum measurement process, whether the wave or particle-like aspect of a system is revealed depends on the details of the measurement chain, an…
A Trade-Off Between Path Entanglement and Quantum Sensitivity
Benjamin Lou, Hudson A. Loughlin, Nergis Mavalvala
Entanglement often increases quantum measurement schemes' sensitivity. However, we find that in precision measurements with zero-mean Gaussian states, such as squeezed states, enta…
A Generalized Schawlow-Townes Limit
Hudson A. Loughlin, Vivishek Sudhir
We study a class of a feedback oscillators realized by a phase-insensitive amplifier in positive feedback, where either the amplifier or the feedback element may determine the osci…
Quantum Linear Time-Translation-Invariant Systems: Conjugate Symplectic Structure, Uncertainty Bounds, and Tomography
Jacques Ding, Hudson A. Loughlin, Vivishek Sudhir
Linear time-translation-invariant (LTI) models offer simple, yet powerful, abstractions of complex classical dynamical systems. Quantum versions of such models have so far relied o…