31 citations · 107 across the 14 of their papers we have counts for
15 papers
Ultimate sensitivity of multiparameter estimation in quantum sensing with undetected photons
Sanjeet Swaroop Panda, Lorcan O. Conlon, Li Gong +4
Quantum sensing with undetected photons is a technique where photons of one wavelength probe a sample, but information is extracted by measuring photons of another wavelength that…
Levitated macroscopic rotors with 10 hours of free spin at room temperature
Xianfeng Chen, Nirmala Raj, Ruvi Lecamwasam +4
Low-dissipation rotors with large angular momentum are essential for precision sensing and probing macroscopic quantum phenomena. To date, low dissipation can only be achieved for…
Spin Correlations in Recirculating Multipass Alkali Cells for Advancing Quantum Magnetometry
Qian Ling Kee, Lingyi Zhao, Ruvi Lecamwasam +6
Multipass cells enable long optical path lengths in compact volumes and are central to quantum technologies such as atomic magnetometers and optical quantum memories. In optical ma…
Microscopic theory of a precessing ferromagnet for ultrasensitive magnetometry
Xueqi Ni, Zhixing Zou, Ruvi Lecamwasam +5
Levitated systems have great potential in quantum sensing and exploring quantum effects at the macroscopic scale. Of particular interest are recent works suggesting that a levitate…
The relative entropy of coherence quantifies performance in Bayesian metrology
Ruvi Lecamwasam, Syed M Assad, Joseph J Hope +3
The ability of quantum states to be in superposition is one of the key features that sets them apart from the classical world. This `coherence' is rigorously quantified by resource…
Modeling Photothermal Effects in High Power Optical Resonators used for Coherent Levitation
Chenyue Gu, Jiayi Qin, Giovanni Guccione +3
Radiation pressure can be used to enable optomechanical control and manipulation of the quantum state of a mechanical oscillator. Optomechanical interaction can also be mediated by…
Feedback Cooling of an Insulating High-Q Diamagnetically Levitated Plate
S. Tian, K. Jadeja, D. Kim +6
Levitated systems in vacuum have many potential applications ranging from new types of inertial and magnetic sensors through to fundamental issues in quantum science, the generatio…
Quantum metrology with linear Lie algebra parameterisations
Ruvi Lecamwasam, Tatiana Iakovleva, Jason Twamley
Lie algebraic techniques are powerful and widely-used tools for studying dynamics and metrology in quantum optics. When the Hamiltonian generates a Lie algebra with finite dimensio…
Controlling the motional quality factor of a diamagnetically levitated graphite plate
Priscila Romagnoli, Ruvi Lecamwasam, Shilu Tian +2
Researchers seek methods to levitate matter for a wide variety of purposes, ranging from exploring fundamental problems in science, through to developing new sensors and mechanical…
Cancellation of photothermally induced instability in an optical resonator
Jiayi Qin, Giovanni Guccione, Jinyong Ma +4
Optical systems are often subject to parametric instability caused by the delayed response of the optical field to the system dynamics. In some cases, parasitic photothermal effect…
Optical back-action on the photothermal relaxation rate
Jinyong Ma, Giovanni Guccione, Ruvi Lecamwasam +4
Photothermal effects can alter the response of an optical cavity, for example, by inducing self-locking behavior or unstable anomalies. The consequences of these effects are often…
Observation of Nonlinear Dynamics in an Optical Levitation System
Jinyong Ma, Jiayi Qin, Geoff T. Campbell +4
Optical levitation of mechanical oscillators has been suggested as a promising way to decouple the environmental noise and increase the mechanical quality factor. Here, we investig…
Photothermally Induced Transparency
Jinyong Ma, Jiayi Qin, Geoff T. Campbell +5
Induced transparency is a common but remarkable effect in optics. It occurs when a strong driving field is used to render an otherwise opaque material transparent. The effect is kn…
Dynamics and Stability of an Optically Levitated Mirror
Ruvi Lecamwasam, Alistair Graham, Jinyong Ma +7
We analyse the dynamics of a one-dimensional vertical Fabry-Pérot cavity, where the upper mirror levitates due to intra-cavity radiation pressure force. A perturbative approach is…
Measurement-based generation of shaped single photons and coherent state superpositions in optical cavities
Ruvindha L Lecamwasam, Michael R Hush, Matthew R James +1
We propose related schemes to generate arbitrarily shaped single photons, i.e. photons with an arbitrary temporal profile, and coherent state superpositions using simple optical el…