Experimental Analysis of Energy Transfers between a Quantum Emitter and Light Fields

Area of Science:

• Quantum optics
• Quantum information science
• Solid-state physics

Background:

• Energy transfer is fundamental to quantum systems, occurring as unitary (useful work) and correlation energy.
• Understanding these energy forms is crucial for quantum technologies and quantum thermodynamics.
• Previous studies focused on theoretical models, lacking experimental validation for specific quantum interactions.

Purpose of the Study:

• To experimentally investigate and quantify unitary and correlation energy transfer between a quantum emitter and light fields.
• To determine the impact of decoherence on unitary energy transfer efficiency.
• To analyze how the quantum purity of emitted light influences energy transfer dynamics.

Main Methods:

• Development and implementation of experimental protocols for measuring energy transfer during spontaneous emission.
• Utilizing interference experiments with a beam splitter to probe the nature of energy transfer.
• Introducing controlled decoherence to observe its effect on unitary energy transfer.

Main Results:

• Measured unitary energy transfer from emitter to light field, consistently below 50% of total energy transfer.
• Demonstrated that decoherence significantly reduces unitary energy transfer.
• Showed that the quantum purity of the emitted field quantitatively dictates the nature of energy transfer.

Conclusions:

• Experimental protocols successfully accessed and quantified distinct energy transfer forms in quantum emitter-light interactions.
• Unitary energy transfer is intrinsically limited and sensitive to environmental decoherence.
• Quantum purity is a critical parameter governing energy transfer mechanisms in quantum optical systems.