Entanglement in a Bragg ReflectionWaveguide

Horn, Rolf T.; Kolenderski, Piotr; Kang, Dongpeng; Abolghasem, Payam; Helt, L. G.; Zhukovsky, Sergei V.; Scarcella, Carmelo; Frera, Adriano Della; Tosi, Alberto; Sipe, J. E.; Weihs, Gregor; Helmy, Amr S.; Jennewein, Thomas

doi:10.1364/cleo_qels.2014.ff1d.4

Cited by 16 publications

(39 citation statements)

References 2 publications

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“…2 in Ref. [6]), one for each polarization, and the degeneracy wavelength occurs at their intersection. Away from degeneracy, it becomes necessary to consider four different photon central wavelengths and two possible non-degeneracies, i.e.…”

Section: Photon Polarization Diversitymentioning

confidence: 99%

“…Mapping quantum photonic technologies into an integrated on-chip setting has become an important task for overcoming the severe stability and scalability limitations of bulk-optics implementations. Recent efforts have demonstrated on-chip quantum state generation [4][5][6], manipulation [7][8][9][10][11][12] and detection [13] across numerous material platforms including GaAs [6,11,13], silicon wire [5,12], silica-on-silicon [7,8,10], lithium niobate [14] and borosilicate glass [9].…”

Section: Introductionmentioning

confidence: 99%

“…Correlated photon pairs are an important resource for quantum photonics that can be generated on-chip by quantum dots [4] or integrated nonlinear waveguides [5,6,14]. As well as being both compact and efficient, integrated photon pair sources have also shown unprecedented versatility in tailoring the properties of the generated twin-photon state through dispersion engineering and birefringence management, thereby establishing control over the spectral and polarization entanglement [15][16][17], photon bandwidths [18], and degree of non-degeneracy.…”

Section: Introductionmentioning

confidence: 99%

“…These states can be selected through the pump polarization or wavelength, allowing for in-situ toggling between cross-and co-polarized generation [19] in addition to continuous tunability over the photon central wavelength separation (i.e. non-degeneracy) [6]. However, the division of generated twin-photons into different waveguides for independent manipulation can be challenging for these structures since, unlike in bulk-optics, the spatial modes available for pair production generally overlap and co-propagate with no way to separate the photons based on their spatial distribution.…”

Section: Introductionmentioning

confidence: 99%

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Deterministic separation of arbitrary photon pair states in integrated quantum circuits

Marchildon

Helmy

2016

Laser & Photonics Reviews

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Entangled photon pairs generated within integrated devices must often be spatially separated for their subsequent manipulation in quantum circuits. Separation that is both deterministic and universal can in principle be achieved through anticoalescent two-photon quantum interference. However, such interference-facilitated pair separation (IFPS) has not been extensively studied in the integrated setting, where the strong polarization and wavelength dependencies of integrated couplers -as opposed to bulk-optics beamsplitters -can have important implications for performance beyond the identical-photon regime. This paper provides a detailed review of IFPS and examines how these dependencies impact separation fidelity and interference visibility. Focus is given to IFPS mediated by an integrated directional coupler. The analysis applies equally to both on-chip and in-fiber implementations, and can be expanded to other coupler architectures such as multimode interferometers. When coupler dispersion is present, the separation performance can depend on photon bandwidth, spectral entanglement, and the linearity of the dispersion. Under appropriate conditions, reduction in the separation fidelity due to loss of non-classical interference can be perfectly compensated for by classical wavelength demultiplexing effects. This work informs the design as well as the performance assessment of circuits for achieving universal photon pair separation for states with tunable arbitrary properties.

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Section: Photon Polarization Diversitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Deterministic separation of arbitrary photon pair states in integrated quantum circuits

Marchildon

Helmy

2016

Laser & Photonics Reviews

Self Cite

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“…In the literature there are two typical ways of realizing a heralded single-photon source (HSPS) based on correlated photon pair generation. The two physical phenomena applied for pair generation are spontaneous four-wave mixing (SFWM) in optical fibers [31][32][33][34] and spontaneous parametric down-conversion (SPDC) in bulk crystals [35][36][37][38][39] or waveguides [40][41][42]. These processes can yield highly indistinguishable single photons in an almost ideal single mode with known polarization [33,35,36,41,43].…”

Section: Introductionmentioning

confidence: 99%

Optimization of periodic single-photon sources based on combined multiplexing

et al. 2016

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We consider periodic single-photon sources with combined multiplexing in which the outputs of several time-multiplexed sources are spatially multiplexed. We give a full statistical description of such systems in order to optimize them with respect to maximal single-photon probability. We carry out the optimization for a particular scenario which can be realized in bulk optics and its expected performance is extremely good at the present state of the art. We find that combined multiplexing outperforms purely spatially or time-multiplexed sources for certain parameters only, and we characterize these cases. Combined multiplexing can have the advantages of possibly using less nonlinear sources, achieving higher repetition rates, and the potential applicability for continuous pumping. We estimate an achievable single-photon probability between 85% and 89%.

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Spontaneous parametric downconversion in waveguides: what's loss got to do with it?

2015

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We derive frequency correlation and exit probability expressions for photons generated via spontaneous parametric downconversion (SPDC) in nonlinear waveguides that exhibit linear scattering loss. Such loss is included within a general Hamiltonian formalism by connecting waveguide modes to reservoir modes with a phenomenological coupling Hamiltonian, the parameters of which are later related to the usual loss coefficients. In the limit of a low probability of SPDC pair production, the presence of loss requires that we write the usual lossless generated pair state as a reduced density operator, and we find that this density operator is naturally composed of two photon, one photon, and zero photon contributions. The biphoton probability density, or joint spectral intensity (JSI), associated with the two-photon contribution is determined not only by a phase matching term, but also by a loss matching term. The relative sizes of the loss coefficients within this term lead to three qualitatively different regimes of SPDC JSIs. If either the pump or generated photon loss is much higher than the other, the side lobes of the phase matching squared sinc function are washed out. On the other hand, if pump and generated photon loss are appropriately balanced, the lossy JSI is identical to the lossless JSI. Finally, if the generated photon loss is frequency dependent, the shape of the JSI can be altered more severely, potentially leading to generated photons that are less frequency correlated though also produced less efficiently when compared to photons generated in low-loss waveguides.

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Entanglement in a Bragg ReflectionWaveguide

Cited by 16 publications

References 2 publications

Deterministic separation of arbitrary photon pair states in integrated quantum circuits

Deterministic separation of arbitrary photon pair states in integrated quantum circuits

Optimization of periodic single-photon sources based on combined multiplexing

Spontaneous parametric downconversion in waveguides: what's loss got to do with it?

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