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Multimode photon blockade
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DOI：10.1038/s41567-022-01630-y.png)
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Abstract
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Interactions are essential for the creation of correlated quantum many-body states. Although two-body interactions underlie most natural phenomena, three- and four-body interactions are important for the physics of nuclei(1), exotic few-body states in ultracold quantum gases(2), the fractional quantum Hall effect(3), quantum error correction(4) and holography(5,6). Recently, a number of artificial quantum systems have emerged as simulators for many-body physics, featuring the ability to engineer strong interactions. However, the interactions in these systems have largely been limited to the two-body paradigm and require building up multibody interactions by combining two-body forces. Here we implement a scheme to create a higher-order interaction between photons stored in multiple electromagnetic modes of a microwave cavity. The system is dressed such that there is collectively no interaction until a target total photon number is reached across multiple distinct modes, at which point the photons interact strongly. In our demonstration, we create interactions involving up to three bodies and across up to five modes. We harness the interaction to prepare single-mode Fock states and multimode W states, which we verify by introducing a multimode Wigner tomography method.
Keywords:
QUANTUM ERROR-CORRECTION
DYNAMICS
STATES
ENTANGLEMENT
GENERATION
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