Abstract
Fourth-order interference is an information processing primitive for photonic quantum technologies, as it forms the basis of photonic controlled-logic gates, entangling measurements, and can be used to produce quantum correlations. Here, using classical weak coherent states as inputs, we study fourth-order interference in 4 × 4 multi-port beam splitters built within multi-core optical fibers, and show that quantum correlations, in the form of geometric quantum discord, can be controlled and maximized by adjusting the intensity ratio between the two inputs. Though these states are separable, they maximize the geometric discord in some instances, and can be a resource for protocols such as remote state preparation. This should contribute to the exploitation of quantum correlations in future telecommunication networks, in particular in those that exploit spatially structured fibers.
Highlights
Quantum information promises to revolutionize the way in which information is transmitted, processed and stored, giving way to paradigms such as quantum cryptography and quantum computing
The source is a continuous wave laser, with a wavelength λ = 1546 nm, that is coupled through a single mode fiber (SMF) to a lithium niobate (LiNbO3) intensity modulator (IM) to produce a
A fiber polarization controller (PC) is used to configure the polarization between the two, and the weak coherent states (WCS) are sent into the 4 multicore fiber beam splitter (4CF-BS)
Summary
Quantum information promises to revolutionize the way in which information is transmitted, processed and stored, giving way to paradigms such as quantum cryptography and quantum computing. A main goal in telecommunications is to increase the transmission capacity of optical channels, as currently, data rates are nearing the physical limits that are possible in single-mode optical fibers, known as the “capacity crunch”[1,2] This has led to a number of interesting encoding schemes and technologies. The relative phase fluctuations between quantum states propagating in different cores in the same cladding is much less than for multiple single-mode fibers[5,6,7] This has led to a number of MCFbased experiments involving quantum systems with dimension greater than two[8,9,10,11,12,13,14]. A fiber-embedded multicore beam splitters (MCF-BS), has only been recently developed
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