Dynamics of entanglement via propagating microwave photons

Abstract

We propose a simple circuit quantum electrodynamics (QED) experiment to test the generation of entanglement between two superconducting qubits. Instead of the usual cavity QED picture, we study qubits which are coupled to an open transmission line and get entangled by the exchange of propagating photons. We compute their dynamics using a full quantum field theory beyond the rotating-wave approximation and explore a variety of regimes which go from a weak coupling to the recently introduced ultrastrong coupling regime. Due to the existence of single photons traveling along the line with finite speed, our theory shows a light cone dividing the spacetime in two different regions. In one region, entanglement may only arise due to correlated vacuum fluctuations, while in the other the contribution from exchanged photons shows up.

v2: New version. 6 pages, 3 figures. Accepted in Phys. Rev. B.

References in corpus (6)

• Charge insensitive qubit design derived from the Cooper pair box
• Testing spooky action at a distance
• Ultrastrong coupling regime of cavity QED with phase-biased flux qubits
• Generation of atom-atom correlations inside and outside the mutual light cone
• Entanglement swapping between spacelike separated atoms
• Generation of Entanglement Outside of the Light Cone

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• Spatiotemporal buildup of the Kondo screening cloud
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• Tunable Coupler for Mediating Interactions between a Two-Level System and a Waveguide from a Decoupled State to the Ultra-Strong Coupling Regime
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