154 citations · 1.1k across the 29 of their papers we have counts for
19 papers · 1 filter
Quantum noise and its evasion in feedback oscillators
Hudson A. Loughlin, Vivishek Sudhir
We study an abstract model of an oscillator realized by an amplifier embedded in a positive feedback loop. The power and frequency stability of the output of such an oscillator are…
Causal State Estimation and the Heisenberg Uncertainty Principle
Junxin Chen, Benjamin B. Lane, Su Direkci +5
The observables of a noisy quantum system can be estimated by appropriately filtering the records of their continuous measurement. Such filtering is relevant for state estimation a…
Theory of phase-adaptive parametric cooling
Alekhya Ghosh, Pardeep Kumar, Fidel Jimenez +2
We propose an adaptive phase technique for the parametric cooling of mechanical resonances. This involves the detection of the mechanical quadratures, followed by a sequence of per…
Quantum theory of feedback cooling of an anelastic macro-mechanical oscillator
Kentaro Komori, Dominika Ďurovčíková, Vivishek Sudhir
Conventional techniques for laser cooling, by coherent scattering off of internal states or through an optical cavity mode, have so far proved inefficient on mechanical oscillators…
Acceleration-induced effects in stimulated light-matter interactions
Barbara Šoda, Vivishek Sudhir, Achim Kempf
The interaction between light and an atom proceeds via three paradigmatic mechanisms: spontaneous emission, stimulated emission, and absorption. All three are resonant processes in…
A Novel Modulation Scheme for Homodyne Detection Control
Danial Shadmany, Benjamin Lane, Vivishek Sudhir +1
Controlling the quadrature measured by a homodyne detector is a universal task in continuous-variable quantum optics. However, deriving an error signal that is linear across theent…
Unruh Effect of Detectors with Quantized Center-of-Mass
Vivishek Sudhir, Nadine Stritzelberger, Achim Kempf
The Unruh effect is the prediction that particle detectors accelerated through the vacuum get excited by the apparent presence of radiation quanta -- a fundamental quantum phenomen…
Approaching the motional ground state of a 10 kg object
Chris Whittle, Evan D. Hall, Sheila Dwyer +197
The motion of a mechanical object -- even a human-sized object -- should be governed by the rules of quantum mechanics. Coaxing them into a quantum state is, however, difficult: th…
Bell correlations between light and vibration at ambient conditions
Santiago Tarrago Velez, Vivishek Sudhir, Nicolas Sangouard +1
Time-resolved Raman spectroscopy techniques offer various ways to study the dynamics of molecular vibrations in liquids or gases and optical phonons in crystals. While these techni…
Atto-Nm Torque Sensing with a Macroscopic Optomechanical Torsion Pendulum
Kentaro Komori, Yutaro Enomoto, Ching Pin Ooi +5
Precise measurements of the displacement of, and force acting on, a mechanical oscillator can be performed by coupling the oscillator to an optical cavity. Brownian thermal forces…
Preparation and decay of a single quantum of vibration at ambient conditions
Santiago Tarrago Velez, Kilian Seibold, Nils Kipfer +3
A single quantum of excitation of a mechanical oscillator is a textbook example of the principles of quantum physics. Mechanical oscillators, despite their pervasive presence in na…
Quantum correlations of light due to a room temperature mechanical oscillator for force metrology
Vivishek Sudhir, Ryan Schilling, Sergey A. Fedorov +3
The coupling of laser light to a mechanical oscillator via radiation pressure leads to the emergence of quantum mechanical correlations between the amplitude and phase quadrature o…
Appearance and disappearance of quantum correlations in measurement-based feedback control of a mechanical oscillator
Vivishek Sudhir, Dalziel J. Wilson, Ryan Schilling +5
Quantum correlations between imprecision and back-action are a hallmark of continuous linear measurements. Here we study how measurement-based feedback can be used to improve the v…
Quantum-limited amplification and parametric instability in the reversed dissipation regime of cavity optomechanics
A. Nunnenkamp, V. Sudhir, A. K. Feofanov +2
Cavity optomechanical phenomena, such as cooling, amplification or optomechanically induced transparency, emerge due to a strong imbalance in the dissipation rates of the parametri…
Nonlinear Quantum Optomechanics via Individual Intrinsic Two-Level Defects
Tomás Ramos, Vivishek Sudhir, Kai Stannigel +2
We propose to use the intrinsic two-level system (TLS) defect states found naturally in integrated optomechanical devices for exploring cavity QED-like phenomena with localized pho…
Phase properties of operator valued measures in phase space
T. Subeesh, Vivishek Sudhir
The Wigner Phase Operator (WPO) is identified as an operator valued measure (OVM) and its eigen states are obtained. An operator satisfying the canonical commutation relation with…
Effect of Squeezing on the Atomic and the Entanglement Dynamics in the Jaynes-Cummings Model
T. Subeesh, Vivishek Sudhir, A. B. M. Ahmed +1
The dynamics of the Jaynes-Cummings interaction of a two-level atom interacting with a single mode of the radiation field is investigated, as the state of the field is gradually ch…
Critical behavior in ultra-strong-coupled oscillators
Vivishek Sudhir, Marco G. Genoni, Jinhyoung Lee +1
We investigate the strong coupling regime of a linear - coupled harmonic oscillator system, by performing a direct diagonalization of the hamiltonian. It is shown that the $x…
Operator formalism for the Wigner phase distribution
T. Subeesh, Vivishek Sudhir
The probability distribution for finding a state of the radiation field in a particular phase is described by a multitude of theoretical formalisms; the phase-sensitivity of the Wi…