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Stationary entangled radiation from micromechanical motion.
S Barzanjeh1, E S Redchenko2, M Peruzzo2
1Institute of Science and Technology Austria, Klosterneuburg, Austria. shabir.barzanjeh@ist.ac.at.
Nature
|June 28, 2019
Summary
Researchers generated path-entangled microwave radiation from a silicon nanostring oscillator. This breakthrough demonstrates quantum correlations in mechanical systems, crucial for quantum-enhanced detection and sensing applications.
Area of Science:
- Quantum mechanics
- Mechanical systems
- Microwave technology
Background:
- Entanglement is key for quantum devices.
- Einstein-Podolsky-Rosen (EPR) states are used in quantum communication.
- Generating EPR states typically involves optical or Josephson circuits.
Purpose of the Study:
- To deterministically generate and distribute entangled states with a mechanical oscillator.
- To achieve a balance between excitation, cooling, and dissipation in an ultralow noise environment.
Main Methods:
- Parametric driving of a 30-micrometre-long silicon nanostring oscillator.
- Observation of stationary emission of path-entangled microwave radiation.
- Squeezing joint field operators of two thermal modes below the vacuum level.
Main Results:
- Stationary emission of path-entangled microwave radiation observed.
- Joint field operators squeezed by 3.40 decibels below vacuum.
- Mechanical oscillator motion correlates up to 50 photons per second per hertz, showing quantum discord robust to microwave noise.
Conclusions:
- Demonstrated non-classical nature of a mechanical oscillator via non-invasive measurement.
- Potential implications for quantum-enhanced detection, sensing, and fundamental physics.
- On-chip devices could entangle subsystems across different energy scales in the future.
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