Engineering spatial correlations of entangled photon pairs by pump beam shaping

Boucher, Pauline; Defienne, Hugo; Gigan, Sylvain

doi:10.1364/ol.425372

Cited by 11 publications

(7 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As can be seen, there is excellent agreement between our experimental results and the expected spatial cross-correlation patterns obtained from the simulation. These results show that it is possible to achieve arbitrary spatial distributions in the twin beam correlations and, thus, represent a substantial advancement with respect to previous proof-of-principle experiments with PDC (20,22).…”

Section: Control Of Distribution Of Spatial Correlationsmentioning

confidence: 64%

“…This is achieved through a complete control of the spatial correlations in the twin beams generated using FWM with a phase-structured pump beam. The degree of control that we are able to obtain is key to enable information encoding in the form of a target spatial distribution and is a substantial advancement over previous experiments with PDC (20,22). Furthermore, the information cannot be read out from either of the individual beams, and the additional use of a constant-phase region at the center of the CGH prevents the information from being present in the bright spatial profiles of the generated twin beams.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Information encoding in the spatial correlations of entangled twin beams

et al. 2023

View full text Add to dashboard Cite

The ability to use the temporal and spatial degrees of freedom of quantum states of light to encode and transmit information is crucial for a robust and efficient quantum network. In particular, the potential offered by the large dimensionality of the spatial degree of freedom remains unfulfilled, as the necessary level of control required to encode information remains elusive. We encode information in the distribution of the spatial correlations of entangled twin beams by taking advantage of their dependence on the angular spectrum of the pump needed for four-wave mixing. We show that the encoded information can only be extracted through joint spatial measurements of the twin beams and not through individual beam measurements and that the temporal quantum correlations are not modified. The ability to engineer the spatial properties of twin beams will enable high-capacity quantum networks and quantum-enhanced spatially resolved sensing and imaging.

show abstract

Section: Control Of Distribution Of Spatial Correlationsmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Information encoding in the spatial correlations of entangled twin beams

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The wave function is controllable by the spectrum of the pump, similar to the case in conventional nonlinear crystals [10] . Note that this control is weighted by the SPDC efficiency function.…”

Section: Spdc From Lithium Niobate Nonlocal Metasurfacementioning

confidence: 97%

“…For nonlinear crystals with a typical thickness on the scale of millimeters to centimeters, the stringent phase-matching condition limits the emission directions of the photon pairs to a certain predefined angle range, making it difficult to flexibly tune the spatial pattern and entanglement of the photon pairs while maintaining generation efficiency. Although control of spatial correlations of the photon pairs was recently reported by engineering the pump beam profile [10] , the specific tuning range of the spatial entanglement was unknown. It was shown that strong multimode entanglement can be achieved in thin nonlinear films [11] ; however, the generation efficiency was much weaker compared to conventional schemes.…”

Section: Introductionmentioning

confidence: 99%

Photon pair generation from lithium niobate metasurface with tunable spatial entanglement

Zhang

Neshev

et al. 2023

Chin. Opt. Lett.

View full text Add to dashboard Cite

The two-photon state with spatial entanglement is an essential resource for testing fundamental laws of quantum mechanics and various quantum applications. Its creation typically relies on spontaneous parametric downconversion in bulky nonlinear crystals where the tunability of spatial entanglement is limited. Here, we predict that ultrathin nonlinear lithium niobate metasurfaces can generate and diversely tune spatially entangled photon pairs. The spatial properties of photons including the emission pattern, rate, and degree of spatial entanglement are analyzed theoretically with the coupled mode theory and Schmidt decomposition method. We show that by leveraging the strong angular dispersion of the metasurface, the degree of spatial entanglement quantified by the Schmidt number can be decreased or increased by changing the pump laser wavelength and a Gaussian beam size. This flexibility can facilitate diverse quantum applications of entangled photon states generated from nonlinear metasurfaces.

show abstract

“…Coincidence imaging can be achieved with modern EMCCD cameras [31,32], SPAD arrays [33][34][35] or time stamping cameras [36]. These technologies are commonly exploited in quantum imaging, such as ghost imaging experiments [37][38][39][40] or quantum superresolution [41][42][43], as well as for fundamental applications, such as characterizing two-photon correlations [32,44], imaging of high-dimensional Hong-Ou-Mandel interference [45][46][47][48], and visualization of the violation of Bell inequalities [49]. Holography techniques have been recently proposed in the context of quantum imaging [50,51]; demonstrating the phaseshifting digital holography in a coincidence imaging regime using polarization entanglement [50], and exploiting induced coherence, i.e.…”

Section: Introductionmentioning

confidence: 99%

Interferometric imaging of amplitude and phase of spatial biphoton states

Zia¹,

Nazanin²,

D’Errico³

et al. 2023

Preprint

View full text Add to dashboard Cite

High-dimensional biphoton states are promising resources for quantum applications, ranging from highdimensional quantum communications to quantum imaging. A pivotal task is fully characterising these states, which is generally time-consuming and not scalable when projective measurement approaches are adopted. However, new advances in coincidence imaging technologies allow for overcoming these limitations by parallelising multiple measurements. Here, we introduce biphoton digital holography, in analogy to off-axis digital holography, where coincidence imaging of the superposition of an unknown state with a reference one is used to perform quantum state tomography. We apply this approach to single photons emitted by spontaneous parametric down-conversion in a nonlinear crystal when the pump photons possess various quantum states. The proposed reconstruction technique allows for a more efficient (3 order-of-magnitude faster) and reliable (an average fidelity of 87%) characterisation of states in arbitrary spatial modes bases, compared with previously performed experiments. Multi-photon digital holography may pave the route toward efficient and accurate computational ghost imaging and high-dimensional quantum information processing.

show abstract

Engineering spatial correlations of entangled photon pairs by pump beam shaping

Cited by 11 publications

References 47 publications

Information encoding in the spatial correlations of entangled twin beams

Information encoding in the spatial correlations of entangled twin beams

Photon pair generation from lithium niobate metasurface with tunable spatial entanglement

Interferometric imaging of amplitude and phase of spatial biphoton states

Contact Info

Product

Resources

About