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Subradiant Bell States in Distant Atomic Arrays.

P-O Guimond¹, A Grankin¹, D V Vasilyev¹

¹Center for Quantum Physics, University of Innsbruck, Innsbruck A-6020, Austria and Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Innsbruck A-6020, Austria.

Physical Review Letters

|April 2, 2019

Summary

This summary is machine-generated.

We demonstrate a long-lived entangled quantum state between two distant atom arrays. This nonlocal entanglement enables high-fidelity quantum information transfer, crucial for quantum networks.

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Area of Science:

Quantum optics
Atomic physics
Quantum information science

Background:

Collective quantum phenomena in atomic arrays are crucial for quantum technologies.
Entanglement between distant quantum systems is a key resource for quantum communication.

Purpose of the Study:

To investigate collective radiation properties of two distant single-layer atomic arrays.
To demonstrate a long-lived Bell superposition state with strong subradiance.
To explore applications in quantum information, including quantum state transfer.

Main Methods:

Modeling two-level atoms in distant single-layer arrays.
Analyzing collective "free-space" radiation properties.
Describing preparation of nonlocal entangled states.
Investigating quantum state transfer fidelity.

Main Results:

A long-lived Bell superposition state of atomic excitations exhibiting strong subradiance was achieved.
This state represents a nonlocal excitation of the two arrays.
High-fidelity deterministic quantum state transfer between arrays was demonstrated.
The system can serve as a resource for nonlocal entanglement.

Conclusions:

Distant atomic arrays can host robust, nonlocal entangled states.
These states are promising for quantum memories and quantum information transfer.
Experimental realization with cold atoms in optical traps is feasible, with imperfections analyzed.