Towards a quantum interface between telecommunication and UV wavelengths: design and classical performance

Rütz, Helge; Luo, Kai‐Hong; Suche, H.; Silberhorn, Christine

doi:10.1007/s00340-016-6325-z

Cited by 12 publications

(18 citation statements)

References 41 publications

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“…For comparison, the attenuation in optical fibers [50], which makes direct transmission of UV light impossible, is shown (c). The concept of a cascaded SPDC/QFC process used for QFC to the UV is depicted in (d).proposal to use a two-stage cavity system [22], we have recently demonstrated a classical upconversion process in a rubidium doped periodically poled potassium titanyl phosphate (PPKTP) waveguide [23], which provides the basis for QFC.In this letter, we report on the QFC between infrared and UV for single photon states. More specifically we show QFC between the telecommunications O-band (around 1310 nm) and the wavelength of the Yb + transition at 369.5 nm, bridging an energy gap larger than arXiv:1610.03239v1 [quant-ph]…”

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“…proposal to use a two-stage cavity system [22], we have recently demonstrated a classical upconversion process in a rubidium doped periodically poled potassium titanyl phosphate (PPKTP) waveguide [23], which provides the basis for QFC.…”

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confidence: 99%

“…The sample is stabilized with an accuracy of ±4 mK around room temperature to obtain quasi-phase-matching (QPM) such that the SFG (1311 nm + 514.5 nm → 369.5 nm) takes place inside the waveguide. The exact QPM wavelength is tunable by temperature, as well as pump power, as discussed in our classical characterization [23]. Behind the waveguide, we use a dichroic mirror to separate the UV light from the pump and input light, then several successive dielectric filters (with a bandwidth of ∼ 6 nm and a cumulative optical density above 22 at the pump wavelength) centered at 370 nm to filter out the remaining pump light.…”

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confidence: 99%

“…The external conversion efficiency is η ext = 5.5 % at 200 mW pump power; in this case an SNR above 2 is achieved at the detector. Considering the mode matching into the waveguide based on transmission measurements [23], we estimate an internal conversion efficiency of η int = 10.5 %. For both, the filtered and unfiltered case, the same conversion efficiency is obtained within the range of experimental repeatability.…”

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Quantum Frequency Conversion between Infrared and Ultraviolet

et al. 2017

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We report on the implementation of quantum frequency conversion (QFC) between infrared (IR) and ultraviolet (UV) wavelengths by using single-stage upconversion in a periodically poled KTP waveguide. Due to the monolithic waveguide design, we manage to transfer a telecommunication band input photon to the wavelength of the ionic dipole transition of Yb + at 369.5 nm. The external (internal) conversion efficiency is around 5% (10%). The high energy pump used in this converter introduces a spontaneous parametric downconversion (SPDC) process, which is a cause for noise in the UV mode. Using this SPDC process, we show that the converter preserves non-classical correlations in the upconversion process, rendering this miniaturized interface a source for quantum states of light in the UV.Quantum networks and long distance quantum communication rely on the faithful transfer and manipulation of quantum states. Because a single quantum system does not necessarily incorporate all the benefits needed, a hybrid system [1, 2] with different nodes operating at dissimilar frequencies may be used to perform each task at its optimal frequency. The process of quantum frequency conversion (QFC) [3,4] has been established as a means to bridge the gap between differing frequencies while keeping the quantum correlations intact. On the one side of that gap, telecommunications bands in the infrared spectral region have consensually been identified as the optimal wavelengths for quantum state transfer because of low loss in optical fibers and a multitude of experimental studies have shown QFC from [4][5][6][7][8][9][10][11] and to [12][13][14][15][16][17] the telecommunications bands, c.f. Fig. 1 (a). Looking at the other side of the gap, one finds that QFC experiments have so far mainly focused on convenient laser wavelengths or transitions in the red/near-infrared spectral region. However, high fidelity photonic state manipulation strongly benefits from high energy transitions and indeed, most of the beneficial ionic transitions are situated at ultraviolet (UV) wavelengths. Most prominently, the Ytterbium-(Yb + ) transition at 369.5 nm constitutes an almost ideal 2-level quantum system due to the Yb + -ion's specific electronic structure [18]. It has been shown that the S 1/2 → P 1/2 transition can act as a photonic interface for efficient and long lived storage of quantum bits [19], and the Yb-ion proves to be useful for quantum computing [18,20] and fundamental studies of light-matter interactions [21]. While this ion is thus an ideal system for the manipulation of quantum states, its application for quantum networks and long distance quantum communication in a hybrid system is conditioned on the possibility to connect it to the optimal fiber transmission window (c.f. fiber attenuation in Fig. 1 (c)). This is a challenging venture and involves significant engineering efforts because of the large energy gap between in-and output, as well as the properties of nonlinear materials at UV wavelengths. In contrast to a [3-10, 12-17, 24-29]...

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Quantum Frequency Conversion between Infrared and Ultraviolet

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“…As a final note, the model presented in (9) requires the refractive indices of both the fundamental and second harmonic fields as the fundamental pump field is varied -the Sellmeier equation. For the titanium-indiffused lithium niobate waveguides investigated here these dispersion relations have been calculated using a finite element solver written in Python implementing the model described in [13].…”

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Interferometric method for determining the losses of spatially multi-mode nonlinear waveguides based on second harmonic generation.

Santandrea¹,

Stefszky²,

Roeland³

et al. 2020

Opt. Express

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The characterisation of loss in optical waveguides is essential in understanding the performance of these devices and their limitations. Whilst interferometric-based methods generally provide the best results for low-loss waveguides, they are almost exclusively used to provide characterization in cases where the waveguide is spatially singlemode. Here, we introduce a Fabry-Pérot-based scheme to estimate the losses of a nonlinear (birefringent or quasi-phase matched) waveguide at a wavelength where it is multi-mode. The method involves measuring the generated second harmonic power as the pump wavelength is scanned over the phasematching region. Furthermore, it is shown that this method allows one to infer the losses of different second harmonic spatial modes by scanning the pump field over the separated phase matching spectra. By fitting the measured phasematching spectra from a titanium indiffused lithium niobate waveguide sample to the model presented in this paper, it is shown that one can estimate the second harmonic losses of a single spatial-mode, at wavelengths where the waveguides are spatially multi-mode. arXiv:1910.07300v2 [physics.optics]

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Coherent state amplification using frequency conversion and a single photon source

Kasture

2017

Optics Communications

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Towards a quantum interface between telecommunication and UV wavelengths: design and classical performance

Cited by 12 publications

References 41 publications

Quantum Frequency Conversion between Infrared and Ultraviolet

Quantum Frequency Conversion between Infrared and Ultraviolet

Interferometric method for determining the losses of spatially multi-mode nonlinear waveguides based on second harmonic generation.

Coherent state amplification using frequency conversion and a single photon source

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