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Chiral Bell-State Transfer via Dissipative Liouvillian Dynamics.

Shishir Khandelwal^1,2,3, Weijian Chen⁴, Kater W Murch⁴

¹Department of Applied Physics, <a href="https://ror.org/01swzsf04">University of Geneva</a>, 1211 Geneva, Switzerland.

Physical Review Letters

|August 30, 2024

Summary

This study demonstrates chiral state transfer for quantum information processing, enabling high-fidelity Bell state production from separable states using dissipation engineering.

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Area of Science:

Quantum physics
Non-Hermitian physics
Quantum information processing

Background:

Chiral state transfer near exceptional points is a counterintuitive phenomenon in non-Hermitian physics.
The practical application of chiral state transfer beyond theoretical concepts remains an open question.

Purpose of the Study:

To demonstrate chiral state conversion between singlet and triplet Bell states using quantum Liouvillian dynamics.
To explore the application of chiral state transfer for producing Bell states from separable states with high fidelity.
To investigate the role of quantum jumps and postselection in enhancing Bell state generation.

Main Methods:

Utilizing fully quantum Liouvillian dynamics to model the system.
Implementing chiral state transfer protocols to convert between Bell states.
Employing postselection techniques to remove quantum jumps and improve fidelity.

Main Results:

Successfully demonstrated chiral state conversion between singlet and triplet Bell states.
Achieved high-fidelity chiral production of Bell states from initially separable states over a wide parameter range.
Showed that postselection of quantum dynamics can yield near-perfect Bell states.

Conclusions:

This work presents the first application of chiral state transfer in quantum information processing.
Introduced a novel method for controlling entangled states through dissipation engineering.
Highlights the potential of non-Hermitian physics phenomena for practical quantum technologies.