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- W4384206548 abstract "Nonreciprocity means that the transmission of a signal depends on its direction of propagation. Despite vastly different platforms and underlying working principles, the realizations of nonreciprocal transport in linear, time-independent systems rely on Aharonov–Bohm interference among several pathways and require breaking time-reversal symmetry. Here we extend the notion of nonreciprocity to unidirectional bosonic transport in systems with a time-reversal symmetric Hamiltonian by exploiting interference between beamsplitter (excitation-preserving) and two-mode-squeezing (excitation non-preserving) interactions. In contrast to standard nonreciprocity, this unidirectional transport manifests when the mode quadratures are resolved with respect to an external reference phase. Accordingly, we dub this phenomenon ‘quadrature nonreciprocity’. We experimentally demonstrate it in the minimal system of two coupled nanomechanical modes orchestrated by optomechanical interactions. Next, we develop a theoretical framework to characterize the class of networks exhibiting quadrature nonreciprocity based on features of their particle–hole graphs. In addition to unidirectionality, these networks can exhibit an even–odd pairing between collective quadratures, which we confirm experimentally in a four-mode system, and an exponential end-to-end gain in the case of arrays of cavities. Across platforms, nonreciprocity requires time-reversal symmetry to be broken. Interference of an excitation-preserving and a non-preserving interaction realizes unidirectional transport in a time-reversal-symmetric system." @default.
- W4384206548 created "2023-07-14" @default.
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- W4384206548 date "2023-07-13" @default.
- W4384206548 modified "2023-10-18" @default.
- W4384206548 title "Quadrature nonreciprocity in bosonic networks without breaking time-reversal symmetry" @default.
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- W4384206548 doi "https://doi.org/10.1038/s41567-023-02128-x" @default.
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