Related Experiment Video
Updated: Apr 21, 2026
09:46
Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
Published on: August 8, 2025
1.3K
Two-mode thermal-noise squeezing in an electromechanical resonator
I Mahboob1, H Okamoto1, K Onomitsu1
1NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, Kanagawa 243-0198, Japan.
Physical Review Letters
|November 1, 2014
Summary
Researchers engineered an electromechanical resonator to create phonon pairs, amplifying motion and generating correlated thermal squeezed states. This work advances macroscopic mechanical entanglement at the single phonon level.
Area of Science:
- Quantum mechanics
- Optomechanics
- Condensed matter physics
Background:
- Electromechanical resonators offer a platform for studying quantum phenomena.
- Parametric down-conversion is a key process in quantum optics for generating correlated photons.
- Achieving macroscopic quantum states requires precise control over mechanical vibrations.
Purpose of the Study:
- To engineer mechanical nonlinearities in an electromechanical resonator.
- To emulate the nondegenerate parametric down-conversion interaction using mechanical modes.
- To generate and investigate two-mode thermal squeezed states and their correlations.
Main Methods:
- Development of a novel electromechanical resonator design.
- Dynamic engineering of mechanical nonlinearities.
- Simultaneous generation of phonon pairs in two macroscopic vibration modes.
- Creation of two-mode thermal squeezed states.
Main Results:
- Successful emulation of nondegenerate parametric down-conversion in a mechanical system.
- Simultaneous generation and amplification of phonons in pairs across two modes.
- Observation of two-mode thermal squeezed states with sub-thermal fluctuations.
- Demonstration of strong correlations between macroscopic phonon ensembles, approaching perfection with increased amplification.
Conclusions:
- The engineered electromechanical resonator enables dynamic control over mechanical nonlinearities.
- The system facilitates the creation of entangled macroscopic mechanical states.
- This research opens avenues for exploring quantum correlations and entanglement in massive mechanical systems at the single phonon level.
Related Concept Videos
01:14Sound Waves: Resonance
2.8K
Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
2.8K
01:28Standing Waves in a Cavity
1.7K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.7K
01:23Parallel Resonance
839
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
839
01:12Double Resonance Techniques: Overview
856
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
856
01:17Design Example: Underdamped Parallel RLC Circuit
809
Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
Starting with a fixed...
809
01:17Magnetic Damping
1.3K
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
1.3K