ORCID Profile
0000-0003-0346-2342
Current Organisation
Xanadu
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Publisher: AIP Publishing
Date: 09-2016
DOI: 10.1063/1.4961627
Abstract: We propose a dual-pump third-order nonlinear scheme for producing pairs of correlated photons that is less susceptible to Raman noise than typical spontaneous four-wave mixing (SFWM) methods. Beginning with the full multimode Hamiltonian, we derive a general expression for the joint spectral litude, from which the probability of producing a pair of photons can be calculated. As an ex le, we demonstrate that a probability of 0.012 pairs per pulse can be achieved in an appropriately designed fused silica microfiber. As compared with single pump SFWM in standard fiber, we calculate that our process shows significant suppression of the spontaneous Raman scattering and an improvement in the signal to noise ratio.
Publisher: American Physical Society (APS)
Date: 29-08-2019
Publisher: American Physical Society (APS)
Date: 03-06-2019
Publisher: American Physical Society (APS)
Date: 30-09-2019
Publisher: American Physical Society (APS)
Date: 11-03-2019
Publisher: AIP
Date: 2012
DOI: 10.1063/1.4750086
Publisher: The Optical Society
Date: 24-09-2012
DOI: 10.1364/OE.20.023100
Publisher: The Optical Society
Date: 16-11-2017
DOI: 10.1364/OL.42.004792
Publisher: American Physical Society (APS)
Date: 23-01-2012
Publisher: AIP Publishing
Date: 07-12-2015
DOI: 10.1063/1.4937374
Abstract: We demonstrate a monolithically integrable heralded photon source in a femtosecond laser direct written glass waveguide. The generation of photon pairs with a wide wavelength separation requires a concomitant large birefringence in the normal dispersion regime. Here, by incorporation of side-stress tracks, we produce a waveguide with a birefringence of 1.64×10−4 and propagation loss as low as 0.21 dB/cm near 980 nm. We measure photon pairs with 300 nm wavelength separation at an internal generation rate exceeding 5.05×106/s. The second order correlations indicate that the generated photon pairs are in a strongly non-classical regime.
Publisher: Optica Publishing Group
Date: 31-08-2010
DOI: 10.1364/OL.35.003006
Publisher: Optica Publishing Group
Date: 05-07-2022
DOI: 10.1364/AOP.445496
Abstract: Integrated optical devices will play a central role in the future development of nonlinear quantum photonics. Here we consider the generation of nonclassical states of light within them with a focus on Gaussian states beyond the low-gain, single photon pair regime accurately described by perturbation theory. Starting from the solid foundation provided by Maxwell’s equations, we then move to applications by presenting a unified formulation that allows for a comparison of stimulated and spontaneous experiments in ring resonators and nanophotonic waveguides and leads directly to the calculation of the quantum states of light generated in high-gain nonlinear quantum photonic experiments.
Publisher: The Optical Society
Date: 22-10-2012
DOI: 10.1364/OL.37.004431
Publisher: The Optical Society
Date: 25-10-2013
DOI: 10.1364/OL.38.004397
Publisher: IEEE
Date: 07-2012
Publisher: The Optical Society
Date: 08-2012
Publisher: Optica Publishing Group
Date: 09-07-2009
DOI: 10.1364/OL.34.002138
Publisher: IEEE
Date: 06-2013
Publisher: The Optical Society
Date: 08-09-2011
DOI: 10.1364/OL.36.003548
Publisher: Springer Science and Business Media LLC
Date: 03-03-2021
DOI: 10.1038/S41586-021-03202-1
Abstract: Growing interest in quantum computing for practical applications has led to a surge in the availability of programmable machines for executing quantum algorithms
Publisher: Elsevier BV
Date: 09-2014
Publisher: The Optical Society
Date: 26-10-2010
Publisher: American Physical Society (APS)
Date: 21-05-2012
Publisher: Springer Science and Business Media LLC
Date: 06-2022
DOI: 10.1038/S41586-022-04725-X
Abstract: A quantum computer attains computational advantage when outperforming the best classical computers running the best-known algorithms on well-defined tasks. No photonic machine offering programmability over all its quantum gates has demonstrated quantum computational advantage: previous machines 1,2 were largely restricted to static gate sequences. Earlier photonic demonstrations were also vulnerable to spoofing 3 , in which classical heuristics produce s les, without direct simulation, lying closer to the ideal distribution than do s les from the quantum hardware. Here we report quantum computational advantage using Borealis, a photonic processor offering dynamic programmability on all gates implemented. We carry out Gaussian boson s ling 4 (GBS) on 216 squeezed modes entangled with three-dimensional connectivity 5 , using a time-multiplexed and photon-number-resolving architecture. On average, it would take more than 9,000 years for the best available algorithms and supercomputers to produce, using exact methods, a single s le from the programmed distribution, whereas Borealis requires only 36 μs. This runtime advantage is over 50 million times as extreme as that reported from earlier photonic machines. Ours constitutes a very large GBS experiment, registering events with up to 219 photons and a mean photon number of 125. This work is a critical milestone on the path to a practical quantum computer, validating key technological features of photonics as a platform for this goal.
Publisher: The Optical Society
Date: 28-08-2012
Publisher: AIP Publishing
Date: 20-05-2013
DOI: 10.1063/1.4807503
Abstract: We consider integrated photon pair sources based on spontaneous four-wave mixing and derive expressions for the pump powers at which various nonlinear processes become relevant for a variety of source materials and structures. These expressions serve as rules of thumb in identifying reasonable parameter regimes for the design of such sources. We demonstrate that if pump powers are kept low enough to suppress cross-phase modulation, multi-pair events as well as many other nonlinear effects are often also constrained to negligible levels.
Publisher: Optica Publishing Group
Date: 27-02-2020
DOI: 10.1364/OL.385741
Abstract: We study spontaneous parametric down conversion (SPDC) in a one-dimensional photonic crystal designed to operate in a doubly resonant configuration, where the frequencies of the pump and the generated photons are both tuned to band-edge resonances. We investigate the spectral correlations of the generated photons as a function of the spectral width of the pump, and demonstrate that the SPDC generation rate can scale with the fifth power of the structure length in the limit of a quasi-continuous-wave pump. We show that such an unusual scaling can be simply connected with the scaling of second-harmonic generation in the same structure, illustrating the general link between spontaneous and stimulated parametric nonlinear processes.
Publisher: Optica Publishing Group
Date: 05-05-2010
DOI: 10.1364/OL.35.001530
Publisher: Optica Publishing Group
Date: 16-07-2010
DOI: 10.1364/OE.18.016206
Publisher: Wiley
Date: 24-10-2012
No related grants have been discovered for Lukas Helt.