Publications by Vivishek Sudhir

Preparation and Decay of a Single Quantum of Vibration at Ambient Conditions

Christophe Marcel Georges Galland, Vivishek Sudhir, Kilian Robert Seibold, Nils Kipfer, Mitchell David Anderson, Santiago Tarrago Velez

A single quantum of excitation of a mechanical oscillator is a textbook example of the principles of quantum physics. But mechanical oscillators, despite their pervasive presence in nature and modem technology, do not genetically exist in an excited Fock s ...

American Physical Society2019

Evidence for structural damping in a high-stress silicon nitride nanobeam and its implications for quantum optomechanics

Tobias Kippenberg, Vivishek Sudhir, Ryan Daniel Schilling, Dalziel Joseph Wilson, Hendrik Schütz, Sergey Fedorov

We resolve the thermal motion of a high-stress silicon nitride nanobeam at frequencies far below its fundamental flexural resonance (3.4 MHz) using cavity-enhanced optical interferometry. Over two decades, the displacement spectrum is well-modeled by that ...

2018

Quantum Correlations of Light from a Room-Temperature Mechanical Oscillator

Tobias Kippenberg, Vivishek Sudhir, Ryan Daniel Schilling, Dalziel Joseph Wilson, Sergey Fedorov

When an optical field is reflected from a compliant mirror, its intensity and phase become quantum-correlated due to radiation pressure. These correlations form a valuable resource: the mirror may be viewed as an effective Kerr medium generating squeezed s ...

American Physical Society2017

Appearance and Disappearance of Quantum Correlations in Measurement-Based Feedback Control of a Mechanical Oscillator

Tobias Kippenberg, Vivishek Sudhir, Amir Hossein Ghadimi, Ryan Daniel Schilling, Dalziel Joseph Wilson, Hendrik Schütz, Sergey Fedorov

Quantum correlations between imprecision and backaction are a hallmark of continuous linear measurements. Here, we study how measurement-based feedback can be used to improve the visibility of quantum correlations due to the interaction of a laser field wi ...

American Physical Society2017

Quantum limits on measurement and control of a mechanical oscillator

Vivishek Sudhir

The precision measurement of position has a long-standing tradition in physics. Cavendish's verification of the universal law of gravitation using a torsion pendulum, Perrin's confirmation of the atomic hypothesis via the precise measurement of the Brownia ...

EPFL2016

Near-Field Integration of a Si3N4 Nanobeam and a SiO2 Microcavity for Heisenberg-Limited Displacement Sensing

Tobias Kippenberg, Vivishek Sudhir, Amir Hossein Ghadimi, Ryan Daniel Schilling, Dalziel Joseph Wilson

A single-chip radio-frequency optomechanical system, consisting of a Si3N4 nanobeam in the evanescent near-field of a SiO2 optical microdisk resonator realizes displacement imprecision >30dB below the standard quantum limit at room-temperature. ...

Ieee2016

Near-Field Integration of a SiN Nanobeam and a SiO2 Microcavity for Heisenberg-Limited Displacement Sensing

Tobias Kippenberg, Vivishek Sudhir, Amir Hossein Ghadimi, Ryan Daniel Schilling, Dalziel Joseph Wilson

Placing a nanomechanical object in the evanescent near field of a high-Q optical microcavity gives access to strong gradient forces and quantum-limited displacement readout, offering an attractive platform for both precision sensing technology and basic qu ...

American Physical Society (APS)2016

A strongly coupled K-type micromechanical system

Tobias Kippenberg, Vivishek Sudhir, Ryan Daniel Schilling, Dalziel Joseph Wilson, Hendrik Schütz, Hajime Okamoto

We study a classical K-type three-level system based on three high-Q micromechanical beam resonators embedded in a gradient electric field. By modulating the strength of the field at the difference frequency between adjacent beam modes, we realize strong d ...

American Institute of Physics2016

Measurement-based control of a mechanical oscillator at its thermal decoherence rate

Tobias Kippenberg, Vivishek Sudhir, Nicolas Piro Mastracchio, Amir Hossein Ghadimi, Ryan Daniel Schilling, Dalziel Joseph Wilson

In real-time quantum feedback protocols(1,2), the record of a continuous measurement is used to stabilize a desired quantum state. Recent years have seen successful applications of these protocols in a variety of well-isolated micro-systems, including micr ...

Nature Publishing Group2015

Quantum-Limited Amplification and Parametric Instability in the Reversed Dissipation Regime of Cavity Optomechanics

Tobias Kippenberg, Vivishek Sudhir

Cavity optomechanical phenomena, such as cooling, amplification, or optomechanically induced transparency, emerge due to a strong imbalance in the dissipation rates of the parametrically coupled electromagnetic and mechanical resonators. Here we analyze th ...

American Physical Society2014

Nonlinear Quantum Optomechanics via Individual Intrinsic Two-Level Defects

Tobias Kippenberg, Vivishek Sudhir

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 phonons. The Jaynes-Cummings-type interaction between TLS and mechanics can rea ...

American Physical Society2013

Phase properties of operator valued measures in phase space

Vivishek Sudhir

The Wigner phase operator (WPO) is identified as an operator valued measure (OVM) and its eigenstates are obtained. An operator satisfying the canonical commutation relation with the Wigner phase operator is also constructed and this establishes a Wigner d ...

Taylor & Francis Ltd2013

Critical behavior in ultrastrong-coupled oscillators

Vivishek Sudhir

We investigate the strong-coupling regime of a linear x-x coupled harmonic-oscillator system by performing a direct diagonalization of the Hamiltonian. It is shown that the x-x coupled Hamiltonian can be equivalently described by a Mach-Zehnder-type interf ...

2012