Parity-dependent State Engineering and Tomography in the ultrastrong coupling regime

Area of Science:

• Quantum physics
• Quantum information processing
• Light-matter interactions

Background:

• The strong coupling regime has advanced quantum physics and information processing.
• The ultrastrong coupling (USC) regime offers novel phenomena and computational advantages.
• A lack of effective decoupling mechanisms hinders control and measurement in the USC regime.

Purpose of the Study:

• To propose a method for controlling quantum states in the USC regime.
• To enable the generation and reconstruction of arbitrary quantum states.
• To overcome limitations in current USC control and measurement.

Main Methods:

• Utilizing parity symmetry conservation for state manipulation.
• Coupling the USC system with an ancillary two-level quantum system.
• Developing a protocol requiring minimal external resources.

Main Results:

• Demonstrated a method for generating arbitrary quantum states in the USC regime.
• Showcased the ability to reconstruct these quantum states.
• The protocol effectively utilizes parity symmetry for control.

Conclusions:

• The proposed method offers a viable solution for controlling quantum states in the USC regime.
• This approach facilitates advancements in quantum information processing applications.
• Minimal resource requirements make the protocol practical for implementation.