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Related Concept Videos

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The Frost circle or the inscribed polygon method is a graphical method for determining the relative energies of π molecular orbitals (MOs) for planar, fully conjugated, and monocyclic compounds. This method was first described by A. A. Frost and Boris Musulin in 1953.
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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
PubMed
Summary
This summary is machine-generated.

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.

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Last Updated: Sep 24, 2025

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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.