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We implement a low-noise, broadband quantum memory for light via off-resonant two-photon absorption in warm atomic vapour. We store heralded single photons and verify that the retrieved fields are anti-bunched.
A quantum optical memory (QM) is a device that can store and release quantum states of light on demand. Such a device is capable of synchronising probabilistic events, for example, locally synchronising non-deterministic photon sources for the generation of multi-photon states, or successful quantum gate operations within a quantum computational architecture [1], as well as for globally synchronising...
Deterministic quantum information processing will require hybrid quantum systems like an interface between microwave and optical photons. We propose a scheme for efficient, multimode and coherent microwave-optical conversion based on frequency mixing in Rydberg atoms.
Quantum memories enable the synchronisation of photonic operations. Raman memories are a promising platform, but are susceptible to four-wave mixing noise. We present a demonstration of a cavity-enhanced Raman memory, showing suppression of four-wave mixing.
We show the highest (>105) and longest-lived (>3 hours) optical depths of alkali vapours in hollow-core photonic crystal fibres, which we will use to implement a novel noiseless broadband quantum memory scheme for temporal multiplexing.
The goal of the optimization process is simultaneously maximization of the single-mode and the anomalous dispersion range in the vicinity of λ= 1.55 μm. Input data in the optimization process are the values of the coefficients appearing in the Sellmeier dispersive formula that determines the value of the refractive index of silica glass as a function of wavelength and the amount and the type of a...
This paper proposes a model-based technique for lowering the entrance barrier for service providers to register services with a marketplace broker, such that the service is rapidly configured to utilize the brokerpsilas local service delivery management components. Specifically, it uses process modeling for supporting the execution steps of a service and shows how service delivery functions (e.g....
Automatic Web service composition (WSC) is a key component of flexible SOAs. We address WSC at the profile/capability level, where preconditions and effects of services are described in an ontology. In its most expressive formulation, WSC has two sources of complexity: (A) a combinatorial explosion of the services composition space, and (B) worst-case exponential reasoning is needed to determine whether...
Automatic composition of semantic Web services should make use of the ontology in which the services are specified. While the approaches can strongly benefit from doing so, they have to deal with the frame and ramification problems, necessitating worst-case exponential reasoning even to determine the outcome of applying a single Web service. The existing approaches to composition either ignore the...
The transformation of chirped super-Gaussian pulses into fundamental soliton in nonlinear optical fiber is discussed. The results of numerical calculations, having in view, the solution of nonlinear Schrodinger equation for complex initial condition using split-step Fourier method are presented. Initial shape-dependent critical value of the chirp parameter is determined. Critical value is a value...
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