Quantum simulation of conical intersections using trapped ions.

Area of Science:

• Quantum simulation
• Photochemistry
• Chemical reaction dynamics

Background:

• Conical intersections govern photochemical reaction outcomes by enabling transitions between electronic states.
• Theoretical models predict a geometric phase accompanying wavepacket evolution on the ground potential energy surface at conical intersections.
• Direct experimental observation of this geometric phase in molecular systems remains elusive.

Purpose of the Study:

• To perform a quantum simulation of a conical intersection using a trapped atomic ion system.
• To experimentally observe the predicted geometric phase associated with conical intersections.

Main Methods:

• Utilized a trapped atomic ion system where internal states represent electronic states and ion motion mimics nuclear motion.
• Constructed a simulated electronic potential by applying state-dependent optical forces to the ions.
• Employed adiabatic state preparation and motional state measurement to detect the geometric phase.

Main Results:

• Successfully simulated a conical intersection in a trapped atomic ion system.
• Provided the first direct experimental observation of the geometric phase in a quantum simulation of a molecular system.
• Demonstrated the utility of combining spin and motional degrees of freedom for quantum simulation.

Conclusions:

• The geometric phase at conical intersections can be experimentally observed using quantum simulation techniques.
• Trapped ion systems offer a powerful platform for simulating complex chemical phenomena like conical intersections.
• This work opens new avenues for studying reaction dynamics and quantum effects in chemistry.