Hyperloss from coherent spatial-mode mixing in quantum-correlated networks
Identifies hyperloss, demonstrates how modest mismatch can erase an entire squeezing advantage, and recovers the hidden correlations through spatial-mode phase control.
Selected publications
Key papers, in context.
Work on preserving quantum correlations, surpassing quantum measurement limits, and carrying those ideas into gravitational-wave instruments.
01 / Spatial modes
Spatial modes are part of the quantum system
Mode mismatch is not always ordinary loss. Its phases and higher-order modes determine whether quantum correlations disappear, survive, or can be recovered.
Transverse Mode Control in Quantum Enhanced Interferometers: A Review and Recommendations for a New Generation
A cross-collaboration review of the mode-control methods needed to distribute squeezed states through large interferometers, with design recommendations for the next generation.
Mitigating mode-matching loss in nonclassical laser interferometry
Shows experimentally that squeezing higher-order spatial modes can restore sensitivity otherwise lost through imperfect mode matching.
02 / Internal squeezing
Generate correlations where the signal is made
Placing the squeeze operation inside a sensor changes its sensitivity-bandwidth tradeoff, its response to optical loss, and the detector architectures that become possible.
Coherent feedback for quantum expander in gravitational-wave observatories
Adds a compact, tunable coherent-feedback cavity to the quantum expander and targets stronger high-frequency reach for neutron-star signals.
Mitigating quantum decoherence in force sensors by internal squeezing
Experimental and theoretical evidence that an internal squeeze operation can make cavity-enhanced force sensing substantially more robust to readout loss.
Fundamental sensitivity limit of lossy cavity-enhanced interferometers with external and internal squeezing
Derives the loss-limited sensitivity bound for external and internal squeezing, then identifies the internal operation that reaches it.
Quantum expander for gravitational-wave observatories
Introduces an all-optical route to extend high-frequency detector bandwidth without surrendering low-frequency sensitivity.
Engineering the optical spring via intra-cavity optical-parametric amplification
Uses the pump phase of an internal parametric amplifier as a control parameter for shaping an optomechanical sensor's response.
Beating the Standard Sensitivity-Bandwidth Limit of Cavity-Enhanced Interferometers with Internal Squeezed-Light Generation
The first experimental demonstration of the idea, with a measured 36% improvement in the sensitivity-bandwidth product of a cavity-enhanced interferometer.
03 / Quantum measurement
Use quantum light to measure macroscopic motion
These papers connect squeezed and entangled optical fields to cryogenic mechanics, large test masses, and interferometer topologies built to expose quantum backaction.
Enhanced optomechanical interaction in an unbalanced Michelson-Sagnac interferometer
Shows how a controlled beam-splitter imbalance strengthens dispersive and dissipative coupling, opening a route toward quantum control of heavier test masses.
Macroscopic quantum mechanics in gravitational-wave observatories and beyond
Connects observed light-mirror quantum correlations in kilometre-scale detectors to broader tests of macroscopic quantum mechanics.
Squeezed-light interferometry on a cryogenically cooled micromechanical membrane
Demonstrates 4.8 dB quantum-enhanced displacement sensing at about 20 K, combining squeezed light with the cryogenic operating logic planned for future observatories.
Demonstration of interferometer enhancement through Einstein-Podolsky-Rosen entanglement
A proof of principle for broadband quantum-noise reduction using entangled signal and idler fields instead of an additional long filter cavity.
04 / Detectors
Turn measurement theory into detector choices
Alternative readouts, high-frequency response, quantum-noise control, and system-level design for LIGO, Einstein Telescope, and future interferometric sensors.
Simultaneous speedmeter and position-meter response in a single tabletop interferometer
The first experimental observation of speedmeter behaviour with a movable test mass, measured beside a conventional position channel in the same interferometer.
Quadrature-witness readout for backscatter mitigation in gravitational-wave detectors dominated by backaction
Uses the usually unmeasured optical quadrature as a witness channel for reconstructing and subtracting transient scattered-light noise.
Optical sensitivities of current gravitational wave observatories at higher kHz, MHz and GHz frequencies
Calculates the little-used high-frequency response already present at free-spectral-range harmonics of GEO 600, KAGRA, LIGO, and Virgo.
Quantum technologies for the Einstein Telescope
A single-author review of squeezed-light sources, filter cavities, loss, readout, and the quantum technologies required across the Einstein Telescope band.
Paired carriers as a way to reduce quantum noise of multicarrier gravitational-wave detectors
Develops paired optical carriers whose opposing detunings and readout angles suppress low-frequency quantum noise and allow flexible spectrum shaping.
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