Entanglement of a pair of quantum emitters under continuous fluorescence measurements

We examine the state and entanglement dynamics of two remote qubits, under continuous measurements of their spontaneous emission. Erasing information about which qubit emitted a particular contribution to the joint measurement signal is possible with both photodetection, and well-chosen quadrature measurements; in either case, measurements then effectively perform an entanglement swapping operation, taking entanglement created between each qubit and its emitted field mode, and generating correlations between the two remote qubits instead. We compare the quantum jump trajectories from photodetection with the diffusive quantum trajectories, which arise from quadrature measurements, demonstrating that they have equivalent average entanglement yield under ideal conditions. Outlook and next steps will be discussed.