Quantum Optics and Quantum Optomechanics
Summary
Quantum optics investigates the quantum properties of light and its interaction with matter at the level of individual photons. It encompasses the generation, control and detection of non-classical light states—such as squeezed fields, entangled photons and fixed-photon-number states—and their use to manipulate atoms, molecules and solid-state qubits. Breakthroughs in laser cooling, cavity QED and integrated photonics have enabled precision control of emitters and guided modes, underpinning advances in quantum communication, simulation and sensing. Quantum optomechanics explores the coherent coupling between electromagnetic fields and mechanical motion via radiation-pressure or gradient forces. In a typical cavity-optomechanical system, the position of a mirror, membrane or collective excitation modulates an optical resonance, while intracavity light exerts a back-action force that can cool the mechanical mode, generate squeezing and transduce between optical, microwave and phononic domains. Together, these disciplines form the foundation of emerging quantum technologies, from ultraprecise interferometry and gravitational-wave detection to hybrid quantum networks.
Research from Nature Portfolio
Phonoritons—zero-dimensional quasiparticles formed by strong coupling of exciton-polariton condensates to confined gigahertz phonons—have been observed in semiconductor microcavities, demonstrating bidirectional microwave-to-optical conversion under piezoelectric control. Mechanical squeezing below the oscillator’s zero-point motion has been achieved in a gigahertz resonator coupled to a superconducting qubit, producing non-Gaussian motional states with negative Wigner functions and high quantum Fisher information. In the mid-infrared, a high-gain SU(1,1) interferometer based on spontaneous parametric down-conversion has enabled Fourier-transform spectroscopy with undetected photons, combining increased photon flux, lower sample exposure and broad spectral coverage via aperiodic poling in the gain medium. These results showcase the generation of non-classical mechanical and optical states and the design of quantum-enhanced spectrometers beyond the reach of conventional detection.
Quantum Optics and Quantum Optomechanics publication trend
The graph below shows the total number of articles in quantum optics and quantum optomechanics across all publications each year (not limited to Nature Index journals).
Technical terms
Phonoriton: A hybrid quasiparticle arising from strong coupling between exciton-polariton modes and confined phonons in a microcavity, enabling coherent phonon-photon exchange.
SU(1,1) interferometer: A nonlinear interferometric configuration using parametric amplifiers at both input and output ports to enhance phase or spectral sensitivity via quantum correlations.
Waveguide QED: The study of quantum emitter interactions mediated by one-dimensional photonic waveguides supporting guided modes.
Zero-point motion: The quantum ground-state fluctuations of a mechanical oscillator’s position, with variance ħ/(2mΩ).
Hong–Ou–Mandel dip: A quantum interference effect in which two indistinguishable photons entering a beamsplitter simultaneously exit together, yielding suppressed coincidence counts.
Ghost imaging: A nonlocal imaging method that reconstructs an object’s spatial or spectral features by correlating photons that interact with the object with those that do not.
References
- Microcavity phonoritons – a coherent optical-to-microwave interface. Nature Communications (2023).
- Quantum squeezing in a nonlinear mechanical oscillator. Nature Physics (2024).
- Fourier-transform infrared spectroscopy with undetected photons from high-gain spontaneous parametric down-conversion. Communications Physics (2024).
- WaveguideQED.jl: An Efficient Framework for Simulating Non-Markovian Waveguide Quantum Electrodynamics. Quantum (2025).
- Quantum Electromagnetic Finite-Difference Time-Domain Solver. Quantum Reports (2020).
- Quantum Ghost Imaging Spectrometer. ACS Photonics (2023).
- Fundamentals of Quantum Optics.
About these summaries
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