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Creating Entanglement Through a Joint Decay Channel

Offek Tziperman, Ron Ruimy, Alexey A. Gorlach, Ido E. Kaminer

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We propose a protocol to create entanglement between emitters in cavity- or waveguide-QED through their decay to a common channel. Heralding on emitters’ states creates desired quantum light states such as cat and GKP.
DOI
10.1364/cleo_fs.2024.ftu3o.4

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Collective spontaneous emission occurs when multiple quantum emitters decay into common radiation modes, resulting in enhanced or suppressed emission. Here, we find the quantum state of light collectively emitted from emitters exhibiting quantum correlations. We unveil under what conditions the quantum correlations are not lost during the emission but are instead transferred to the output light. Under these conditions, the inherent nonlinearity of the emitters can be tailored to create desired photonic states in the form of traveling single-mode pulses, such as Gottesman-Kitaev-Preskill and Schrödinger-cat states, that are useful for error correction in quantum computation. To facilitate such predictions, our work reveals the multimode nature of collective spontaneous emission, capturing the role of the emitters' positions, losses, interactions, and beyond-Markov dynamics on the emitted quantum state of light. We present manifestations of these effects in different physical systems, with examples of cavity QED, waveguide QED, and atomic arrays with up to a few dozen emitters. Our findings suggest paths for creating and manipulating multiphoton quantum light for bosonic codes in continuous-variable-based quantum computation, communications, and sensing.
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Pulsed coherent and squeezed driving of a spin-SSS emitter as a deterministic source of Wigner-negative light
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