Controlling polarization entanglement in biphotons generated with partially spatially coherent pump beam

Sharma, Preeti; Pathak, Nishant Kumar; Kanseri, Bhaskar

doi:10.1016/j.rinp.2021.104506

Cited by 9 publications

(1 citation statement)

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“…The transverse distribution of biphotons exhibits strong spatial correlations with the pump as a coherent beam. Lately, there have been some studies dealing with biphotons generated with a partially coherent and incoherent pump which revealed the dependence of pump coherence on profiles (theoretically) [15], quadrature squeezing [16], quantum interference [17], spatial entanglement [18,19] and polarization entanglement [20,21]. The study of interference in double-slit experiments using quantum beams has always been a topic of interest owing to quantum lithography [22], ghost imaging [23,24], and fundamental studies [25,26].…”

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confidence: 99%

Experimental generation and characterization of partially spatially coherent qubits

2023

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Partially spatially coherent qubits are more immune to turbulent atmospheric conditions than coherent qubits, which makes them excellent candidates for free-space quantum communication. In this article, we report the generation of partially spatially coherent qubits in a spontaneous parametric down-conversion (SPDC) process using a Gaussian Schell model (GSM) pump beam. For this non-linear process, we demonstrate experimentally for the ﬁrst time, the transfer of spatial coherence features of the pump (classical) to the biphotons (quantum) ﬁeld. Also, the spatial proﬁles of partially coherent qubits generated in type-I and type-II non-collinear SPDC process are experimentally observed and multi-mode nature of partially coherent photons (qubit) is ascertained. These investigations pave the way toward the e cient generation of partially spatially coherent qubits with a tunable degree of spatial coherence, which lead to wide range of applications in frontier areas such as quantum cryptography, teleportation, imaging, and lithography.

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