Simple preparation of Bell and Greenberger-Horne-Zeilinger states using ultrastrong-coupling circuit QED
Artikel i vetenskaplig tidskrift, 2018

The ability to entangle quantum systems is crucial for many applications in quantum technology, including quantum communication and quantum computing. Here, we propose a simple and versatile setup for deterministically creating Bell and Greenberger-Horne-Zeilinger states between photons of different frequencies in a two-step protocol. The setup consists of a quantum bit (qubit) coupled ultrastrongly to three photonic resonator modes. The only operations needed in our protocol are to put the qubit in a superposition state and then tune its frequency in and out of resonance with sums of the resonator-mode frequencies. By choosing which frequency we tune the qubit to, we select which entangled state we create. We show that our protocol can be implemented with high fidelity using feasible experimental parameters in state-of-the-art circuit quantum electrodynamics. One possible application of our setup is as a node distributing entanglement in a quantum network.

Författare

Vincenzo MacRí

RIKEN

F. Nori

RIKEN

University of Michigan

Anton Frisk Kockum

RIKEN

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Physical Review A

2469-9926 (ISSN) 2469-9934 (eISSN)

Vol. 98 6 062327

Ämneskategorier

Annan fysik

Kommunikationssystem

Annan elektroteknik och elektronik

DOI

10.1103/PhysRevA.98.062327

Mer information

Senast uppdaterat

2019-01-24