Enhancing Cavity Quantum Electrodynamics via Antisqueezing: Synthetic Ultrastrong Coupling

Area of Science:

• Quantum electrodynamics (QED)
• Cavity QED systems
• Quantum optics

Background:

• Achieving strong light-matter coupling is crucial for quantum technologies.
• Enhancing coupling in weak-coupling systems remains a challenge.
• Existing methods may have limitations in control or scalability.

Purpose of the Study:

• To present and analyze a novel method for exponentially enhancing light-matter coupling.
• To enable weak-coupling systems to enter the strong and ultrastrong coupling regimes.
• To demonstrate adiabatic preparation of entangled states using this enhanced coupling.

Main Methods:

• Utilizing parametric (two-photon) driving of a cavity.
• Implementing time-dependent control over the system.
• Analyzing the transition from weak to ultrastrong coupling regimes.

Main Results:

• Exponential enhancement of light-matter coupling demonstrated.
• Weak-coupling systems successfully transitioned to strong and ultrastrong coupling regimes.
• Adiabatic preparation of a highly entangled ground state shown as an application.

Conclusions:

• The proposed method offers a powerful way to engineer light-matter interactions.
• This technique opens possibilities for creating and utilizing highly entangled states.
• Potential applications in remote entanglement and quantum information processing.