Researchers at Queen's University built a time-bin-encoded QPNN using a single quantum dot, achieving Bell-state analysis fidelity of 0.96 (>0.99 with time gating) with constant photonic component count regardless of network scale.
#QuantumPhotonics #QuantumMachineLearning #News
97.1% two-photon Franson interference visibility achieved using cascaded PPLN + passive PIC Mach-Zehnder interferometers at telecom C-band, with CAR >10³ at 1.7 mW pump—no active phase stabilization required, fully DWDM-compatible.
#QuantumPhotonics #QuantumNetworking #Research
Semiconductor QD achieves 2.5 GHz single-photon generation at telecom C-band with g²(0)<4% multiphoton suppression and >85% two-photon interference visibility, matching theoretical limits via Purcell-enhanced biexciton cascade excitation.
#QuantumPhotonics #QuantumCommunication #SinglePhotonSource
Vilnius University researchers demonstrated dynamic control of slow-light vector vortices in a four-level tripod atomic system, achieving polarisation cycling and petal-like intensity patterns via EIT. Enables advanced optical data storage and photonic qubits.
#QuantumPhotonics #SlowLight #News
SPDC source configurations were identified that decouple spatial and spectral degrees of freedom, enabling high-purity OAM-entangled photon pairs without lossy filtering—mapped across OAM order, crystal length, and beam waist for scalable photonic QIT.
#QuantumPhotonics #OAMEntanglement #SPDC
Researchers achieved ~79.4% efficient telecom conversion of atomic biphotons using diamond-type FWM in cold Rb ensembles, preserving temporal waveforms and nonclassical correlations—enabling practical atomic-to-fiber quantum network interfaces.
#QuantumNetworking #QuantumPhotonics #Research
Exact discrete algebraic framework for SPDC two-photon Zernike states in turbulence shows decoherence is dominated by low-order aberration modes. Partial AO correcting to 6th radial order nearly fully restores spatial quantum correlations.
#QuantumPhotonics #QuantumCommunication #Research
Using MPS and frequency-space scattering theory, researchers show that photon localization in bimodal pulse envelopes dramatically alters two-photon nonlinear dynamics and transmitted correlation functions in single-atom waveguide-QED.
#WaveguideQED #QuantumPhotonics #Research
Researchers show silicon photonic nanobeam cavities with Q~10⁷ and mode volume ~0.01µm³, pumped by three lasers via degenerate four-wave mixing, can achieve unconditional single-photon blockade using arbitrarily weak χ⁽³⁾ nonlinearity.
#PhotonBlockade #QuantumPhotonics #Research
KIST researchers demonstrate a thin-film lithium niobate chip integrating SHG frequency doubling with GHz EO switching, achieving >1mW green output at 42.2dB extinction for nanosecond-precision NV center spin control via Rabi and Ramsey protocols.
#QuantumPhotonics #NVCenter #Research
Researchers at Heriot-Watt & TU demonstrated Hong-Ou-Mandel interference from 5 independent quantum dots on one chip using programmable spatial light modulators, achieving a bunching parameter g=1.52, surpassing the 2-emitter limit of 0.5.
#QuantumPhotonics #QuantumDots #News
A time-bin QPNN architecture using a single chirally-coupled quantum dot achieves Bell-state analysis at F=0.995, ε=0.864. Crucially, network size scales without adding photonic components—only one nonlinear element is ever required.
#QuantumPhotonics #QuantumNeuralNetworks #Research
Researchers integrated NbOI₂ vdW crystal directly onto optical fiber facets, achieving lens-free in-line SPDC photon-pair generation with CAR ~4600—far exceeding prior vdW-based sources—enabling compact, alignment-free fiber quantum photonics.
#PhotonicQuantum #QuantumPhotonics #Research
First spatial & spectral characterization of SPDC photon pairs in a LiNbO₃ bullseye nanoresonator. Record 0.45 Hz/mW pair-count rate validated by a quasi-normal-mode framework, enabling predictive design of nanoscale quantum light sources.
#QuantumPhotonics #SPDC #Research
Buried AlAs/Al₂O₃ stressors enable deterministic InGaAs/GaAs QDs emitting at ~1.3 µm without strain-reducing layers, achieving 95% single-photon purity at 4K and 72% at 77K—a scalable, industry-compatible route to fiber-ready quantum photonic sources.
#QuantumPhotonics #SinglePhotonSource #Research
Quantum fluctuations in BaTiO3 overcome the magnitude-vs-stability trade-off: strain or Ca-composition tuning pushes phase boundaries to 0K, yielding a stable cryogenic electro-optic response 14× greater than BaTiO3-on-Si below 25K.
#QuantumPhotonics #Ferroelectrics #Research
Quantum dots embedded in a nonlocal GaAs metasurface generate structured single photons via quasi-BIC modes, enabling OAM beams and holograms with Purcell enhancement—a scalable path to integrated structured quantum light sources.
#QuantumPhotonics #SinglePhoton #Metasurface
A silicon photonic chip with 700+ components enables arbitrary 4D quantum measurements at 97.7% avg fidelity—surpassing projective limits: 23× lower discrimination error, 10.6% better state estimation, and 37% more certified randomness per round.
#QuantumPhotonics #QuantumMeasurement #Research
ScAlN/GaN quantum wells paired with inverse-designed dielectric metasurfaces achieve >10¹⁰ biphotons/s in the telecom band from a 0.5μm-thick structure via SPDC, with 4 orders-of-magnitude modal overlap improvement over standard gratings.
#QuantumPhotonics #EntangledPhotons #Research
MPLC-based free-space interferometers implement arbitrary M-mode unitary transforms requiring only O(M) phase planes—not O(M²)—experimentally validated on up to 16 spatial pixel modes including Hadamard, Bell-state measurement, and permutation unitaries.
#QuantumPhotonics #LinearOptics #Research
Floquet engineering enables coherent on/off switching of light-matter coupling in a TLS-cavity system without phase loss. Gaussian-modulated envelopes exploit CDT to achieve >0.99 fidelity, robust against phonon-induced non-Markovian dephasing.
#QuantumPhotonics #FloquetEngineering #Research
Four OPA-assisted protocols distribute CV QND entangling gates between distant users. A geometric phase scheme achieves 2x noise advantage over squeezing-based methods, enabling distributed cluster state fusion for measurement-based quantum computing.
#QuantumComputing #QuantumPhotonics #Research
Using repeated scattering off a single two-level emitter in a chiral waveguide with a harmonic temporal trap, researchers achieve CZ gate fidelity ~99.2% and Bell-state analyzer success ~99.6% (N=17), enabling near-deterministic photonic quantum gates.
#QuantumPhotonics #QuantumComputing #Research
Researchers built a Si₃N₄ photonic chip integrating squeezed light sources, entangling gates, and homodyne detection to generate and verify four-qumode continuous-variable cluster states—a scalable platform for optical quantum computing and networking.
#QuantumPhotonics #QuantumComputing #News
Researchers demonstrate a monolithic TFLN chip enabling programmable frequency-bin qubit control, realizing universal single-qubit gates (97.1% fidelity), a CZ gate (91.4%), and HOM interference (94.9% visibility) for scalable photonic quantum computing.
#QuantumPhotonics #LithiumNiobate #Research
Stanford researchers built a thin-film lithium niobate OPA using a second-harmonic resonant pump loop, achieving >17 dB gain at <200 mW — an order of magnitude over prior devices — enabling chip-scale quantum squeezing, biosensors, and broadband comms.
#PhotonicChip #QuantumPhotonics #News
LNOI waveguide achieves on-chip four-photon telecom-band entanglement with 229 nm phase-matching bandwidth, fidelity 0.74±0.01, and 1 Hz fourfold coincidence rate — a ~3× improvement over prior integrated platforms.
#QuantumPhotonics #QuantumNetworks #Research
First experimental visualisation of tripartite entanglement via spin-skyrmion states, demonstrating non-local topological switching, quantum multiskyrmions, and GHZ-embedded Bell state dynamics using entangled photon pairs.
#QuantumPhotonics #QuantumTopology #Research
Harvard-led team achieves 91% photon transfer efficiency between diamond & LiNbO₃ with ~1 dB/coupler loss. Q factors >5×10⁴ at 735nm enable silicon vacancy photon collection at 5K, enabling scalable quantum network photonic circuits.
#QuantumPhotonics #QuantumNetworks #News
Novel hybrid multiplexing scheme using active time-bin delays and passive fiber Bragg grating arrays achieves ~2000x improvement in multi-photon generation rates, targeting 8-photon states at ~1 kHz with commercially available hardware.
#QuantumPhotonics #PhotonicQuantumComputing #Research
