Coherent Control of Cooperative Photon Emission from Indistinguishable Quantum Emitters

Entanglement between remote matter systems is the cornerstone of quantum information transfer, crucial for establishing quantum secure communication between distant parties as well as for distributed quantum information processing architectures [1]. This can be done via the implementation of cooperative light-matter coupling between coherently controllable matter qubits. This can manifest in collective rate enhancements, such as those at the heart of super radiance [2], but also includes effects such as measurement-induced remote entanglement via path erasure [3]. In this talk, I will present our latest work [4] on coherent control of cooperative emission arising from two distant but indistinguishable solid-state emitters due to path erasure. The primary signature of cooperative emission, the emergence of “bunching” at zero-delay in an intensity correlation experiment [5], is used to characterize the indistinguishability of the emitters, their dephasing, and the degree of correlation in the joint system which can be coherently controlled. In a stark departure from a pair of uncorrelated emitters, we observe photon statistics resembling that of a weak coherent state in Hong-Ou-Mandel type interference measurements. Our experiments establish new techniques to control and characterize cooperative behavior between matter qubits using the full quantum optics toolbox, a key stepping-stone on the route to realizing large-scale quantum photonic networks.

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[2] R. H. Dicke, Phys. Rev. 93, 99 (1954).
[3] S. Wolf et. Al., Phys. Rev. Lett. 124, 063603 (2020).
[4] Z. Koong et. al., arXiv:2105.09399 (2021).
[5] A. Sipahigil et. al., Science 354, 847-850 (2016)