Direct transfer of pump amplitude to parametric down-converted photons

Anwar, Ali; Vaity, Pravin; Perumangatt, Chithrabhanu; Singh, R. P.

doi:10.1364/ol.43.001155

Cited by 8 publications

(4 citation statements)

References 37 publications

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“…It is known [16][17][18] that these structured beams with a sufficiently large value of κ ⊥ , i. e., beyond the paraxial approximation and with κ ⊥ δ κ ⊥ , lead to a SPDC angular spectrum formed by two non-concentric cones. This contrasts with the opposite case κ ⊥ δ κ ⊥ (including the Gaussian-beam case κ ⊥ → 0) for which the angular spectrum consists of a single cone [17][18][19][20][21]. The location of the two cones is asymmetric, as mediated by the pump walk-off and the asymmetric distribution of the wavevectors in the incoming Bessel pump beam with respect to the optic axis.…”

Section: Introductionmentioning

confidence: 91%

Spatial control of spontaneous parametric down-conversion photon pairs through the use of apertured Bessel-Gauss pump beams

et al. 2019

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We demonstrate, both experimentally and theoretically, a method that allows us to modify the spatial properties of photon pairs produced by the process of spontaneous parametric downconversion (SPDC) with an apertured, zeroth-order Bessel-Gauss beam. Concentrating on the use of a half-plane aperture, we show that the phasematching conditions for non-paraxial pump beams can be controlled by simply changing the aperture orientation. Partially blocking the pump beam, leads to a selection of either one of two individual cones that form a dual-cone SPDC angular spectrum, or a portion of both of them. We can likewise determine the shape and orientation of the conditional angular spectrum. This control of the SPDC spatial properties could be useful for quantum information processing protocols.

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Section: Introductionmentioning

confidence: 91%

Spatial control of spontaneous parametric down-conversion photon pairs through the use of apertured Bessel-Gauss pump beams

et al. 2019

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“…Discrete variable entanglement includes polarization [1] and orbital angular momentum [2], and have been studied and utilized in numerous applications as quantum key distribution [3], superdense coding [4], quantum teleportation [5], etc. The transverse position and momentum of the SPDC photons are the continuous spatial variables that have gained attention in recent years [6][7][8][9], and found applications in the field of quantum imaging [10][11][12][13][14][15], quantum metrology [16] and quantum communication [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Spatial Entanglement

Patil¹,

Prabhakar²,

Biswas³

et al. 2022

Preprint

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The photon-pairs generated through spontaneous parametric down-conversion (SPDC) possess strong correlations in their transverse position and momentum degrees of freedom. For such photonpairs, the transverse position correlation length depends on the crystal thickness and the pump wavelength, whereas the transverse momentum correlation length depends on the beam waist and spatial coherence length of the pump. By controlling these parameters, it is possible to engineer the spatial entanglement. Here, we utilize the circular asymmetry of the pump by using an elliptical-Gaussian beam to change the degree of entanglement in transverse directions, which we call anisotropic entanglement. We show the interrelation between the degree of anisotropic entanglement and the asymmetry in the beam width. In addition, we also show that for a highly asymmetric pump beam, the entanglement along the y direction completely vanishes, whereas the entanglement in x direction remains intact.

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“…It has been experimentally verified that the amplitude, as well as the helical phase of an optical vortex pump, gets transferred to SPDC photons [24,25]. Based on the OAM selection rule in SPDC process, single photons carrying OAM are generated in 'heralding' configuration by pumping an optical vortex beam into a nonlinear crystal and projecting one photon from the generated pair to 'zero OAM' (Gaussian) mode [26].…”

Section: Introductionmentioning

confidence: 99%

Size invariant twisted optical modes for efficient generation of higher dimensional quantum states

Anwar,

Prabhakar,

Singh

2021

Preprint

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Optical vortex beams are profiled as helical wavefronts with a phase singularity carrying an orbital angular momentum (OAM) associated with their spatial distribution. The transverse intensity distribution of a conventional optical vortex has a strong dependence on the carried topological charge. However, perfect optical vortex (POV) beams have their transverse intensity distribution independent of their charge. Such 'size-invariant' POV beams have found exciting applications in optical manipulation, imaging and communication. In this article, we investigate the use of POV modes in the efficient generation of high dimensional quantum states of light. We generate heralded single photons carrying OAM using spontaneous parametric down-conversion (SPDC) of POV beams. We show that the heralding efficiency of the SPDC single photons generated with POV pump is greater than that with normal optical vortex beams. The dimensionality of the twophoton OAM states is increased with POV modes in the pump and projective measurements using Bessel-Gaussian vortex modes that give POV, instead of the Laguerre-Gaussian modes.

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Direct transfer of pump amplitude to parametric down-converted photons

Cited by 8 publications

References 37 publications

Spatial control of spontaneous parametric down-conversion photon pairs through the use of apertured Bessel-Gauss pump beams

Spatial control of spontaneous parametric down-conversion photon pairs through the use of apertured Bessel-Gauss pump beams

Anisotropic Spatial Entanglement

Size invariant twisted optical modes for efficient generation of higher dimensional quantum states

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