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Updated: Sep 24, 2025
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
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Topological Quantum State Control through Exceptional-Point Proximity
Maryam Abbasi1, Weijian Chen1,2, Mahdi Naghiloo1,3
1Department of Physics, Washington University, St. Louis, Missouri 63130, USA.
Physical Review Letters
|May 6, 2022
Summary
Researchers demonstrate a new quantum control method using non-Hermitian physics in superconducting circuits. This technique enables nonreciprocal quantum state transfer and reveals chiral geometric phases, advancing quantum bath engineering.
Area of Science:
- Quantum physics
- Superconducting circuits
- Non-Hermitian systems
Background:
- Quantum evolution of non-Hermitian qubits is crucial for understanding complex quantum phenomena.
- Dissipative superconducting transmon circuits offer a platform for realizing non-Hermitian Hamiltonians.
Purpose of the Study:
- To investigate the quantum evolution of a non-Hermitian qubit in a dissipative superconducting transmon circuit.
- To explore nonreciprocal quantum state transfer and chiral geometric phases by encircling an exceptional point.
Main Methods:
- Real-time tuning of system parameters to encircle an exceptional point.
- Observation of quantum state transfer and geometric phase accumulation.
- Distinguishing coherent and incoherent effects in the complex energy landscape.
Main Results:
- Achieved nonreciprocal quantum state transfer through encircling an exceptional point.
- Observed chiral geometric phases, confirming coherent quantum evolution.
- Differentiated coherent and incoherent effects related to exceptional point encircling.
Conclusions:
- Demonstrated a novel method for quantum state vector control.
- Highlighted new possibilities in quantum bath engineering via dynamical non-Hermitian control.
- Verified quantum coherent nature in a complex energy landscape.
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