Nijil Lal
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View article: Indistinguishability of arbitrary photons for entanglement generation in scalable quantum networks
Indistinguishability of arbitrary photons for entanglement generation in scalable quantum networks Open
Using a network-compatible source of single photons, we study the interference of heralded signal and idler photons that are not part of the same biphoton pair. We characterize the indistinguishability of such arbitrary single photons that…
View article: Clock synchronization characterization of the Washington DC metropolitan quantum network (DC-QNet)
Clock synchronization characterization of the Washington DC metropolitan quantum network (DC-QNet) Open
Quantum networking protocols relying on interference and precise time-of-flight measurements require high-precision clock synchronization. This study describes the design, implementation, and characterization of two optical time transfer m…
View article: Engineering quantum states from a spatially structured quantum eraser
Engineering quantum states from a spatially structured quantum eraser Open
Quantum interference is a central resource in many quantum-enhanced tasks, from computation to communication. While usually occurring between identical photons, it can also be enabled by performing projective measurements that render the p…
View article: Synchronized source of indistinguishable photons for quantum networks
Synchronized source of indistinguishable photons for quantum networks Open
We present a source of indistinguishable photons at telecom wavelength, synchronized to an external clock, for the use in distributed quantum networks. We characterize the indistinguishability of photons generated in independent parametric…
View article: Engineering quantum states from a spatially structured quantum eraser
Engineering quantum states from a spatially structured quantum eraser Open
Quantum interference is a central resource in many quantum-enhanced tasks, from computation to communication protocols. While it usually occurs between identical input photons, quantum interference can be enabled by projecting the quantum …
View article: Quantum key distribution with multiphoton pulses: an advantage
Quantum key distribution with multiphoton pulses: an advantage Open
In this article, we introduce a quantum key distribution protocol for the line of sight channels based on coincidence measurements. We present a proof-of-concept implementation of our protocol. We show that using coincidence measurements t…
View article: Quantum key distribution with multiphotonpulses: An advantage
Quantum key distribution with multiphotonpulses: An advantage Open
In this article, we introduce a quantum key distribution protocol for the line of sight channels based on coincidence measurements. We present a proof-of-concept implementation of our protocol. We show that using coincidence measurements t…
View article: Polarization-orbital angular momentum duality assisted entanglement observation for indistinguishable photons
Polarization-orbital angular momentum duality assisted entanglement observation for indistinguishable photons Open
Duality in the entanglement of identical particles manifests that entanglement in only one variable can be revealed at a time. We demonstrate this using polarization and orbital angular momentum (OAM) variables of indistinguishable photons…
View article: Quantum key distribution with multiphoton pulses: An advantage
Quantum key distribution with multiphoton pulses: An advantage Open
In this article, we introduce a quantum key distribution protocol for the line of sight channels based on coincidence measurements. We present a proof-of-concept implementation of our protocol. We show that using coincidence measurements t…
View article: Observing sub-Poissonian statistics of twisted single photons using oscilloscope
Observing sub-Poissonian statistics of twisted single photons using oscilloscope Open
Heralded single photon sources (HSPSs) from spontaneous parametric down-conversion are widely used as single photon sources. We study the photon number statistics of an HSPS carrying orbital angular momentum in our laboratory and observe t…
View article: Engineering of orbital angular momentum spectrum of down-converted\n photons with mode-invariant pump
Engineering of orbital angular momentum spectrum of down-converted\n photons with mode-invariant pump Open
In this article we investigate the orbital angular momentum spectrum of\nphotons produced in parametric down conversion process. We study how the\ntransverse profile of the pump mode affects the spectrum as compared to a\ngaussian pump bea…
View article: Engineering of orbital angular momentum spectrum of down-converted photons with mode-invariant pump
Engineering of orbital angular momentum spectrum of down-converted photons with mode-invariant pump Open
In this article we investigate the orbital angular momentum spectrum of photons produced in parametric down conversion process. We study how the transverse profile of the pump mode affects the spectrum as compared to a gaussian pump beam. …
View article: Single photon sources with different spatial modes
Single photon sources with different spatial modes Open
We study the correlation properties of single photons carrying orbital angular momentum (OAM) in a Hanbury Brown and Twiss (HBT) type experiment. We have characterized single photon sources obtained by pumping a nonlinear crystal with a la…
View article: Pancharatnam phase in non-separable states of light
Pancharatnam phase in non-separable states of light Open
We generate the non-separable state of polarization and orbital angular momentum (OAM) using a laser beam. The generated state undergoes a cyclic polarization evolution which introduces a Pancharatnam geometric phase to the polarization st…
View article: Selecting the pre-detection characteristics for effective fiber coupling of entangled photon sources
Selecting the pre-detection characteristics for effective fiber coupling of entangled photon sources Open
Photon modes have an important role in characterizing the quantum sources of light. Proper coupling of various photon modes obtained in spontaneous parametric down conversion (SPDC) process in optical fibers is essential to generate an eff…