Generating Maximal Entanglement between Spectrally Distinct Solid-State Emitters

Abstract

We show how to create maximal entanglement between spectrally distinct solid-state emitters embedded in a waveguide interferometer. By revealing the rich underlying structure of multi-photon scattering in emitters, we show that a two-photon input state can generate deterministic maximal entanglement even for emitters with significantly different transition energies and line-widths. The optimal frequency of the input is determined by two competing processes: which-path erasure and interaction strength. We find that smaller spectral overlap can be overcome with higher photon numbers, and quasi-monochromatic photons are optimal for entanglement generation. Our work provides a new methodology for solid-state entanglement generation, where the requirement for perfectly matched emitters can be relaxed in favour of optical state optimisation.

Tracking control of two qubit entanglement using piecewise time-independent method

“…The effect of the environment on the electron spin is larger than on the nuclear spin. Such problem is relevant when discussing the effects of decoherence in solidstate devices based on superconductors [5,[53][54][55][56], as for example spin-Majorana qubits [57], quantum memories [58] and transmon qubits [59]. To control the dynamics we use a tracking control protocol with piecewise time-independent potentials [60,61].…”