Muddassar Rashid
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View article: Neuromorphic detection and cooling of microparticles in arrays
Neuromorphic detection and cooling of microparticles in arrays Open
Micro-objects levitated in a vacuum are an exciting platform for precision sensing due to their low dissipation motion and the potential for control at the quantum level. Arrays of such sensors would offer increased sensitivity, directiona…
View article: Extreme-Temperature Single-Particle Heat Engine
Extreme-Temperature Single-Particle Heat Engine Open
There are many exotic thermodynamic processes that are hard to study in nature. Here, we synthesize a structured environment to explore the extremes of thermodynamics. We present an engine running at extreme temperatures of above ten Megak…
View article: Neuromorphic detection and cooling of microparticles in arrays
Neuromorphic detection and cooling of microparticles in arrays Open
Micro-objects levitated in a vacuum are an exciting platform for precision sensing due to their low dissipation motion and the potential for control at the quantum level. Arrays of such sensors would offer increased sensitivity, directiona…
View article: Massive quantum systems as interfaces of quantum mechanics and gravity
Massive quantum systems as interfaces of quantum mechanics and gravity Open
The traditional view from particle physics is that quantum gravity effects should only become detectable at extremely high energies and small length scales. Due to the significant technological challenges involved, there has been limited p…
View article: Event-based imaging of levitated microparticles
Event-based imaging of levitated microparticles Open
Event-based imaging is a neuromorphic detection technique whereby an array of pixels detects a positive or negative change in light intensity at each pixel and is, hence, particularly well suited to detect motion. Compared to standard came…
View article: Testing collapse models with levitated nanoparticles: Detection challenge
Testing collapse models with levitated nanoparticles: Detection challenge Open
We consider a nanoparticle levitated in a Paul trap in ultrahigh cryogenic\nvacuum, and look for the conditions which allow for a stringent\nnoninterferometric test of spontaneous collapse models. In particular we\ncompare different possib…
View article: Data used in article: Precession Motion in Levitated Optomechanics
Data used in article: Precession Motion in Levitated Optomechanics Open
Data associated and used in the following article: Ulbricht, H., Toros, M., Rashid, M., & Setter, A. J. (2018). Precession motion in levitated optomechanics. Physical Review Letters, 121(25), [253601]. DOI: 10.1103/PhysRevLett.121.253601
View article: Static force characterization with Fano anti-resonance in levitated optomechanics
Static force characterization with Fano anti-resonance in levitated optomechanics Open
We demonstrate a classical analogy to the Fano anti-resonance in levitated optomechanics by applying a DC electric field. Specifically, we experimentally tune the Fano parameter by applying a DC voltage from 0 kV to 10 kV on a nearby charg…
View article: Precession Motion in Levitated Optomechanics
Precession Motion in Levitated Optomechanics Open
We investigate experimentally the dynamics of a nonspherical levitated nanoparticle in a vacuum. In addition to translation and rotation motion, we observe the light torque-induced precession and nutation of the trapped particle. We provid…
View article: Direct measurement of the electrostatic image force of a levitated charged nanoparticle close to a surface
Direct measurement of the electrostatic image force of a levitated charged nanoparticle close to a surface Open
We report on optical levitation experiments to probe the interaction of a nanoparticle with a surface in vacuum. The observed interaction-induced effect is a controllable anharmonicity of the particle trapping potential. We reconstruct the…
View article: Detection of anisotropic particles in levitated optomechanics
Detection of anisotropic particles in levitated optomechanics Open
We discuss the detection of an anisotropic particle trapped by an elliptically polarized focused Gaussian laser beam. We obtain the full rotational and translational dynamics, as well as the measured photocurrent in a general-dyne detectio…
View article: Experimental demonstration of Fano anti-resonance in levitated optomechanics
Experimental demonstration of Fano anti-resonance in levitated optomechanics Open
We demonstrate a classical analogy to the Fano anti-resonance in levitated optomechanics by applying a DC electric field. Specifically, we experimentally tune the Fano parameter by applying a DC voltage from 0~kV to 10~kV on a nearby charg…
View article: Dynamical model selection near the quantum-classical boundary
Dynamical model selection near the quantum-classical boundary Open
We discuss a general method of model selection from experimentally recorded\ntime-trace data. This method can be used to distinguish between quantum and\nclassical dynamical models. It can be used in post-selection as well as for\nreal-tim…
View article: Wigner Function Reconstruction in Levitated Optomechanics
Wigner Function Reconstruction in Levitated Optomechanics Open
We demonstrate the reconstruction of theWigner function from marginal distributions of the motion of a single trapped particle using homodyne detection. We show that it is possible to generate quantum states of levitated optomechanical sys…
View article: Wigner Reconstruction in Levitated Optomechanics
Wigner Reconstruction in Levitated Optomechanics Open
We demonstrate the reconstruction of the Wigner function from marginal distributions of the motion of a single trapped particle using homodyne detection. We show that it is possible to generate quantum states of levitated optomechanical sy…
View article: Parametric feedback cooling of levitated optomechanics in a parabolic mirror trap
Parametric feedback cooling of levitated optomechanics in a parabolic mirror trap Open
Levitated optomechanics, a new experimental physics platform, holds promise for fundamental science and quantum technological sensing applications. We demonstrate a simple and robust geometry for optical trapping in vacuum of a single nano…
View article: Experimental Realization of a Thermal Squeezed State of Levitated Optomechanics
Experimental Realization of a Thermal Squeezed State of Levitated Optomechanics Open
We experimentally squeeze the thermal motional state of an optically levitated nanosphere by fast switching between two trapping frequencies. The measured phase-space distribution of the center of mass of our particle shows the typical sha…
View article: Controlling the Motion of a Nanoparticle Trapped in Vacuum
Controlling the Motion of a Nanoparticle Trapped in Vacuum Open
We demonstrate a simple and robust geometry for optical trapping in vacuum of a single nanoparticle based on a parabolic mirror and the optical gradient force, and we demonstrate rapid parametric feedback cooling of all three motional degr…