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Material: KTP Polarizations: y → y + z 775 nm → 1550 nm + 1550 nm Λ: 68.40 µm m: -1 Pump FWHM: 0.88 nm Dimensions: 4 µm x 4 µm x 5 mm Table 3.4: Proposed and investigated crystal parameters Figure 3.38: Pump envelope x phasematching function = JSA of the propsed PDC state with the additional side peaks of the sinc in figure 3.39. These peaks lead to an increased distinguishability and limit the minimal achievable amount of entanglement. The minimum cooperativity parameter possible with this proposed setup is K=1.20 (S=0.67). It is important to note that a precise control over the pump width is crucial because already detunings of about 0.5 nm result in a considerable increase of the frequency correlations (see Figure 3.40). Effects from spatial modes pose no problem. The phasematching curves, for different spatial modes, are too much apart as plotted in Figure 3.41, and could be filtered with ease. Additionally it is unlikely for wavelengths around 1550 nm to propagate in higher spatial modes in a waveguide of 4 µm x 4 µm. In the experiment we observed only single mode propagations in this wavelength regime. Compared with the already implemented group velocity matching in KDP [10, 11], this proposal exhibits two main advantages. The use of waveguides will result in a much brighter single photon source and the wavelength of 1550 nm is optimal to distribute the heralded photons through optical fibers. 30
Figure 3.39: Pump envelope x phasematching function = JSA with consideration of the sinc contributions Cooperativity parameter 2 1.8 1.6 1.4 1.2 Decorrelation 1 0 0.5 1 1.5 2 2.5 3 Pump sigma [nm] Figure 3.40: Change of the cooperativity parameter by tuning of the pump width 31
Page 1 and 2: Towards a pure heralded single phot
Page 3: ii A.2 id201 programming . . . . .
Page 6 and 7: Chapter 1. Overview 2
Page 8 and 9: experimental data. This thesis is d
Page 10 and 11: a nonlinear, nonmagnetic material,
Page 12 and 13: Figure 3.3: Parametric down convers
Page 14 and 15: For the volume integration, we rest
Page 16 and 17: Figure 3.5: 1D square-wave periodic
Page 18 and 19: and 3.10). Figure 3.9: 0-0 waveguid
Page 20 and 21: By inserting the corresponding term
Page 22 and 23: Λi phasematching Λs Figure 3.18:
Page 24 and 25: pump mode → signal mode + idler m
Page 26 and 27: Hence, we have to ensure a separabl
Page 28 and 29: 3.2.2 Frequency entanglement of two
Page 30 and 31: 3.3 Generating pure heralded single
Page 32 and 33: Material: KTP Polarizations: y →
Page 36 and 37: 32 Ωi�PHz� 1.26 1.23 1.2 Φ
Page 38 and 39: The first appealing feature of coun
Page 40 and 41: Ωi�PHz� 0.10 0.05 1.22 1.215
Page 42 and 43: 38 Figure 3.53: Different pump freq
Page 45 and 46: 4 Experiment 4.1 Avalanche photodio
Page 47 and 48: kcounts / second 0.14 0.12 0.1 0.08
Page 49 and 50: kcounts per second 180 160 140 120
Page 51 and 52: or z-polarization, and we are left
Page 53 and 54: Gaussian functions. The result is a
Page 55 and 56: that the phasematching point was sh
Page 57 and 58: this two dimension plane on the bla
Page 59 and 60: plotted in Appendix A.4.3. Shg powe
Page 61 and 62: kSHG(762.5nm) 14.5506/ µm kp1(1525
Page 63 and 64: kSHG(762.5nm) 14.2703/ µm kp1(1525
Page 65 and 66: Outlook measurement signal counts/s
Page 67: This is the silliest stuff that eve
Page 70 and 71: �� pdc package Ver: 1.0 Main pa
Page 72 and 73: �� this is a list of all variab
Page 74 and 75: ��refracrtive index of the o�
Page 76 and 77: ��Begin: Sellmeier Equations fo
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4 enhancedSellmeier.m iassert�opt
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6 enhancedSellmeier.m ��extract
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8 enhancedSellmeier.m opte � ToEx
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10 enhancedSellmeier.m ��refrac
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12 enhancedSellmeier.m iassert�op
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14 enhancedSellmeier.m If�optairB
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2 wmschmidt.m compact carrier �0,
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A.2 id201 programming The data acqu
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(EXIM LSQI EGLVMWX 0EFSV MH MH ûMH
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(EXIM LSQI EGLVMWX 0EFSV MH MH ûMH
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(EXIM LSQI EGLVMWX 0EFSV MH MH û T
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kcounts / second kcounts / second k
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kcounts / second 80 70 60 50 40 30
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kcounts per second kcounts per seco
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E y E y -> E y E y E y -> E z E y E
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BCT0703-B12 second measurement The
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Shg power Pump power [a.u.] Shg pow
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Shg power Pump power [a.u.] 90 80 7
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ITI0706-B124 power measurement The
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Bibliography [1] H. J. Kimble, M. D
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[25] Carlot Canalias and Valdas Pas
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Thanks ❏ To Dr. Christine Silberh
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Erklärung Gemäß §31(2) der Dipl
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Diploma thesis

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