Researchers from the University of East Anglia have developed a new method that uses quantum light to detect quantum sound. Their study reveals the complex quantum interactions between molecular vibrations and photons.  The findings are expected to improve understanding of light-matter interactions on a molecular scale. They could also lead to new avenues in quantum technology and biology. 

Quantum mechanics states that physical objects can have both wave and particle properties. A single particle of light is known as a photon, and a single quantum of sound is known as a phonon. Phonons are the smallest unit of sound energy. 

The quantum theory of light was proposed by Einstein. It states that light travels in bundles of energy, and each bundle is known as a photon. Each photon carries a quantity of energy equal to the product of the frequency of vibration of that photon and Planck’s constant.

Solving Molecular Mysteries: How Quantum Light “Hears” Quantum Sound. Researchers from the University of East Anglia have introduced a pioneering method using quantum light to detect quantum sound. Their study sheds light on the intricate quantum interactions between molecular vibrations and photons

Quantum entanglement is a phenomenon that occurs when a group of particles are generated, interact, or share spatial proximity in such a way that the quantum state of each particle of the group cannot be described independently of the state of the others. For example, a particle vibrating due to your sound when you speak can affect a molecule inside a star at the edge of the Universe instantly. 

Quantum entanglement explains how two subatomic particles can be intimately linked to each other even if separated by billions of light-years of space. Despite their vast separation, a change induced in one will affect the other. 

Entanglement occurs when a pair of particles, such as photons, interact physically. A laser beam fired through a certain type of crystal can cause individual photons to be split into pairs of entangled photons

According to the quantum theory of light, light is made up of photons, which are the smallest particles of light. Photons have a dual nature, meaning they can behave as both particles and waves. Their behavior depends on the type of experiment performed on them. 

Light behaves mainly like a wave, but it can also be considered to consist of tiny packages of energy called photons. Photons have no mass or charge. The energy of a photon is directly proportional to its frequency.  The energy of a photon of visible light is very small, being on the order of 4 × 10−19 joule. 

Light shows wave-like properties through interference and diffraction. The particle-like property of light is confirmed by Einstein’s photoelectric effect.

The quantum theory of sound states that sound has a quantum nature. Sound waves are made up of tiny quantum chunks called phonons. The energy of a sound wave is an integer multiple of a fundamental quantum of vibrational energy called a phonon. 

In condensed matter physics, a phonon is used to describe sound. A phonon is analogous to a photon in quantum electrodynamics. 

Quantum acoustics is the study of sound under conditions such that quantum mechanical effects are relevant. For most applications, classical mechanics are sufficient to accurately describe the physics of sound. 

The Quantum Vocal Theory of Sounds (QVTS) states that any sound can be expressed and described as the evolution of a superposition of vocal states. These states include: 

• Phonation 
• Turbulence 
• Supraglottal myoelastic vibrations

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