Fig. 4: Implementation of the multi-particle ‘which-path’ scheme using waveguide-QED with quantum emitters such as atoms in a Λ configuration. | npj Quantum Information

Fig. 4: Implementation of the multi-particle ‘which-path’ scheme using waveguide-QED with quantum emitters such as atoms in a Λ configuration.

From: Many-body entanglement via ‘which-path’ information

Fig. 4

One of the electronic transitions couples to the driving laser (a). The two ground states represent the two “paths'', \(\left\vert 0\right\rangle\) and \(\left\vert 1\right\rangle\). Coherent control pulses act as Hadamard gates (b). Weak illumination pulses couple each emitter in the correct state to the waveguide, creating a conditional displacement (c).

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