Post-selection free, integrated optical source of non-degenerate, polarization entangled photon pairs

Herrmann, Harald; Yang, Xu; Thomas, Abu; Poppe, Andreas; Sohler, W.; Silberhorn, Christine

doi:10.1364/oe.21.027981

Cited by 61 publications

(46 citation statements)

References 20 publications

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“…Note also that our device does not yet represent a source for multi-partite entanglement. Slight technical variations can be made in order to generate polarization-entangled GHZ-states on-chip, such as replacing our type-0 PDC sources with cascaded type-II PDC stages, each having interlaced poling structures [36]. Additional guided-wave polarizing beam splitters and electro-optical polarization controllers could support these integrated devices.…”

Section: Resultsmentioning

confidence: 99%

On-chip generation of photon-triplet states

et al. 2016

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Efficient sources of many-partite non-classical states are key for the advancement of quantum technologies and for the fundamental testing of quantum mechanics. We demonstrate the generation of time-correlated photon triplets at telecom wavelengths via pulsed cascaded parametric down-conversion in a monolithically integrated source. By detecting the generated states with success probabilities of (6.25 ± 1.09) × 10 −11 per pump pulse at injected powers as low as 10 µW, we benchmark the efficiency of the complete system and deduce its high potential for scalability. Our source is unprecedentedly long-term stable, it overcomes interface losses intrinsically due to its monolithic architecture, and the photon-triplet states dominate uncorrelated noise significantly. These results mark crucial progress towards the proliferation of robust, scalable, synchronized and miniaturized quantum technology.

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Section: Resultsmentioning

confidence: 99%

On-chip generation of photon-triplet states

et al. 2016

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“…Many integrated quantum devices have been fabricated, ranging from waveguide sources [1][2][3][4][5][6] and entanglement sources [7][8][9][10][11][12] to on-chip detectors [13,14], from quantum teleporters [15] to complex linear circuits [16] with photonic manipulation [17]. However, the functioning of these circuits still relies on the careful alignment of external bulk components, limiting usefulness outside the lab.…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Plug-and-Play Source of Heralded Single Photons

et al. 2017

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Reliable generation of single photons is of key importance for fundamental physical experiments and to demonstrate quantum technologies. Waveguide-based photon pair sources have shown great promise in this regard due to their large degree of spectral tunability, high generation rates and long photon coherence times. However, for such a source to have real world applications it needs to be efficiently integrated with fiber-optic networks. We answer this challenge by presenting an alignment-free source of photon pairs in the telecommunications band that maintains heralding efficiency > 50 % even after fiber pigtailing, photon separation, and pump suppression. The source combines this outstanding performance in heralding efficiency with a compact, stable, and easy-touse 'plug & play' package: one simply connects a laser to the input and detectors to the output and the source is ready to use. This high performance can be achieved even outside the lab without the need for alignment which makes the source extremely useful for any experiment or demonstration needing heralded single photons.

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“…Indeed nonlinear waveguides have been adopted to realize sources of polarization entangled states, but the entanglement was either generated outside the chip with a probabilistic splitting on different spatial modes, 18,21 or the pairs were split deterministically by frequency, leading to spectrally non-degenerate photons. 19 While for some applications this strategy can be useful, degeneracy over all degrees of freedom is a fundamental requirement when dealing with quantum tasks where completely indistinguishable particles are needed. Recently it has been demonstrated that parametric down conversion in a coupled structure allows for the generation of path entangled states.…”

Section: Introductionmentioning

confidence: 99%

A two-channel, spectrally degenerate polarization entangled source on chip

et al. 2017

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Integrated optics provides the platform for the experimental implementation of highly complex and compact circuits for quantum information applications. In this context integrated waveguide sources represent a powerful resource for the generation of quantum states of light due to their high brightness and stability. However, the confinement of the light in a single spatial mode limits the realization of multi-channel sources. Due to this challenge one of the most adopted sources in quantum information processes, i.e. a source which generates spectrally indistinguishable polarization entangled photons in two different spatial modes, has not yet been realized in a fully integrated platform. Here we overcome this limitation by suitably engineering two periodically poled waveguides and an integrated polarization splitter in lithium niobate. This source produces polarization entangled states with fidelity of F¼ 0:973 ± 0:003 and a test of Bell's inequality results in a violation larger than 14 standard deviations. It can work both in pulsed and continuous wave regime. This device represents a new step toward the implementation of fully integrated circuits for quantum information applications.

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Post-selection free, integrated optical source of non-degenerate, polarization entangled photon pairs

Cited by 61 publications

References 20 publications

On-chip generation of photon-triplet states

On-chip generation of photon-triplet states

High-Efficiency Plug-and-Play Source of Heralded Single Photons

A two-channel, spectrally degenerate polarization entangled source on chip

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