New article in Physical Review Letters

Our article "Perfect quantum state transfer in a dispersion-engineered waveguide" has just been published in Physical Review Letters!

Quantum state transfer between two qubits coupled to a common electromagnetic field is strongly limited by the intrinsic temporal asymmetry of the single-photon pulse emitted by the first qubit, which cannot be perfectly absorbed by a second one. In conventional quantum networks, this problem is solved by actively modulating the qubit-photon coupling in time. In this work, developed in collaboration with the team of Stefan Rotter, we propose the first passive solution. We theoretically show that by proper engineering of the light's dispersion relation, the pulse emitted by a qubit can reshape during propagation into its time-reversed form. This results in state transfer fidelities above 99% and requires no active modulation.

Check the press release here!

Figure: O. Diekmann