Highly efficient frequency conversion with bandwidth compression of quantum light

Allgaier, Markus; Ansari, Vahid; Sansoni, Linda; Eigner, Christof; Quiring, Viktor; Ricken, Raimund; Harder, Georg; Brecht, Benjamin; Silberhorn, Christine

doi:10.1038/ncomms14288

Cited by 92 publications

(80 citation statements)

References 38 publications

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“…Such a reduction would only be expected in the presence of width error  d m w 0.4 m, as illustrated in the figure. Allgaier et al [34] also characterized the phasematching spectrum of their device and the measurement showed deviations from the expected sinc 2 profile, as shown in figure 13. These deviations indicates the presence of non-negligible fabrication imperfections, as it was shown in figure 6 that the presence of 1/f noise leads to more prominent side lobes and an asymmetric phasematching profile.…”

Section: Impact Of Fabrication Errors On the Performance Of A Bandwidmentioning

confidence: 98%

“…We consider a 7 μm wide waveguide with different lengths L and varying magnitude δw of 1/f noise on the waveguide width. The input bandwidth is set to Δν in =963±11 GHz as in [34], while the output bandwidth Δν out is defined as the FWHM of a Gaussian fit to the phasematching spectrum, following the method of [34].…”

Section: Impact Of Fabrication Errors On the Performance Of A Bandwidmentioning

confidence: 99%

“…In figure 12(a) it is also shown, with a dashed line, the BCF measured in [34] for their 27 mm long waveguide. It is immediately evident that the measured compression factor is well below the theoretically predicted value.…”

Section: Impact Of Fabrication Errors On the Performance Of A Bandwidmentioning

confidence: 99%

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Fabrication limits of waveguides in nonlinear crystals and their impact on quantum optics applications

et al. 2019

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Waveguides in nonlinear materials are a key component for photon pair sources and offer promising solutions to interface quantum memories through frequency conversion. To bring these technologies closer to every-day life, it is still necessary to guarantee a reliable and efficient fabrication of these devices. Therefore, a thorough understanding of the technological limitations of nonlinear waveguiding devices is paramount. In this paper, we study the link between fabrication errors of waveguides in nonlinear crystals and the final performance of such devices. In particular, we first derive a mathematical expression to qualitatively assess the technological limitations of any nonlinear waveguide. We apply this tool to study the impact of fabrication imperfections on the phasematching properties of different quantum processes realized in titanium-diffused lithium niobate waveguides. Finally, we analyse the effect of waveguide imperfections on quantum state generation and manipulation for few selected cases. Studying the impact of fabrication errors on the waveguide widths, we find that the presence of correlated noise plays a major role in the degradation of the phasematching and we suggest different possible strategies to reduce the impact of fabrication imperfections.

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Section: Impact Of Fabrication Errors On the Performance Of A Bandwidmentioning

confidence: 98%

Section: Impact Of Fabrication Errors On the Performance Of A Bandwidmentioning

confidence: 99%

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Fabrication limits of waveguides in nonlinear crystals and their impact on quantum optics applications

et al. 2019

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“…This characteristic feature has led to the development of a variety of techniques for spectral and temporal manipulations of single photons [5][6][7][8][9][10][11][12]. Recently, spectral compression of photons has gained widespread attention in order to efficiently interface wide-band sources of correlated photons with narrow-band nodes of a quantum network, for example, quantum dots and atomic systems [11,[13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Temporal and spectral manipulations of correlated photons using a time lens

et al. 2017

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A common challenge in quantum information processing with photons is the limited ability to manipulate and measure correlated states. An example is the inability to measure picosecond scale temporal correlations of a multi-photon state, given state-of-the-art detectors have a temporal resolution of about 100 ps. Here, we demonstrate temporal magnification of time-bin entangled two-photon states using a time-lens, and measure their temporal correlation function which is otherwise not accessible because of the limited temporal resolution of single photon detectors. Furthermore, we show that the time-lens maps temporal correlations of photons to frequency correlations and could be used to manipulate frequency-bin entangled photons. This demonstration opens a new avenue to manipulate and analyze spectral and temporal wavefunctions of many-photon states.

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“…We employ the quantum pulse gate (QPG) [15,16], a device recently introduced by our group, as a platform to perform these up-conversion measurements. This device is developed around a group-velocity matched, temporal overlap sensitive sum-frequency generation operating with high efficiency [17]. This way we cut down the measurement times from tens of minutes to the order of one second.…”

Section: Introductionmentioning

confidence: 99%

Fast time-domain measurements on telecom single photons

Allgaier

Vigh

Ansari

et al. 2017

Quantum Sci. Technol.

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Abstract. Direct measurements on the temporal envelope of quantum light are a challenging task and not many examples are known since most classical pulse characterisation methods do not work on the single photon level. Knowledge of both spectrum and timing can however give insights on properties that cannot be determined by the spectrum alone. While temporal measurements on single photons on timescales of tens of picoseconds are possible with superconducting photon detectors and picosecond measurements have been performed using streak cameras, there are no commercial single photon sensitive devices with femtosecond resolution available. While time-domain sampling using sumfrequency generation has been already exploited for such measurement, inefficient conversion has necessitated long integration times to build the temporal profile. We demonstrate a highly efficient waveguided sum-frequency generation process in Lithium Niobate to measure the temporal envelope of single photons with femtosecond resolution with short enough acquisition time to provide a live-view of the measurement. We demonstrate the measurement technique and combine it with spectral measurements using a dispersive fiber time-of-flight spectrometer to determine upper and lower bounds for the spectral purity of heralded single photons. The approach complements the joint spectral intensity measurements as a measure on the purity can be given without knowledge of the spectral phase.arXiv:1702.03240v1 [quant-ph]

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Highly efficient frequency conversion with bandwidth compression of quantum light

Cited by 92 publications

References 38 publications

Fabrication limits of waveguides in nonlinear crystals and their impact on quantum optics applications

Fabrication limits of waveguides in nonlinear crystals and their impact on quantum optics applications

Temporal and spectral manipulations of correlated photons using a time lens

Fast time-domain measurements on telecom single photons

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