Self-Testing Mutually Unbiased Bases in Higher Dimensions with Space-Division Multiplexing Optical Fiber Technology

Physical Review Applied, Journal Year: 2021, Volume and Issue: 15(1)

Published: Jan. 15, 2021

In the device-independent quantum information approach, implementation of a given task can be self-tested solely from recorded statistics and without detailed models for employed devices. Even though experimentally demanding, it provides appealing verification schemes advanced technologies that naturally fulfil associated requirements. this work, we study whether self-testing protocols adopted to certify proper functioning new devices built with modern space-division multiplexing optical fiber technology. Specifically, consider prepare-and-measure protocol M.~Farkas J.~Kaniewski (Phys.~Rev.~A 99, 032316) measurements corresponding mutually unbiased bases (MUBs) in dimension $d>2$. our scheme, state preparation measurement stages are implemented multi-arm interferometer multi-core fibers related components. Due high-overlap interferometer's modes achieved technology, able reach required visibilities two four-dimensional MUBs. We also quantify operational quantities measurements: (i) incompatibility robustness, connected Bell violations, (ii) randomness extractable outcomes. Since MUBs lie at core several protocols, results practical interest future works relying on fibers.

Language: Английский

---

Enhanced sensitivity and response speed in surface-normal InGaAs photodetectors with Au grating through waveguide-plasmon coupling

Optics Express, Journal Year: 2024, Volume and Issue: 32(18), P. 32271 - 32271

Published: Aug. 12, 2024

We proposed the improvement of near-infrared (NIR) sensitivity and response speed for surface-normal photodetector by coupling surface plasmon (SP) mode excited at plasmonic grating to waveguide (WG) in absorption layer. The thinner layer accelerated speed. efficiency InGaAs thickness 300 nm was significantly improved 51.4% wavelength 1550 under wave vectors matching between SP WG mode. Moreover, one-dimensional line space exhibited high polarization selectivity. Polarized light discrimination is applied a multi-valued modulation scheme multiplexing signal channels. enhancement NIR useful two-dimensional (2D) integration photodetectors increasing spatial channels can contribute data capacity expansion next-generation optical communication systems.

Language: Английский

---

Polarization-sensitive terahertz reflective multi-channel beam separation by cascaded configuration

Results in Physics, Journal Year: 2021, Volume and Issue: 28, P. 104702 - 104702

Published: Aug. 15, 2021

In this paper, we proposed polarization-dependent terahertz reflective beam splitters under normal incidence, in which resonance-domain diffraction gratings with period comparable to incident wavelength are adopted achieve multi-channel separation, appropriate total efficiency, and good efficiency uniformity. At the frequency of 2.5200 THz (correspondingly λ = 118.83 μm), can implement energy output varying from dual- seven-port. For transverse electric (TE) polarization, reach ~ 95% (assuming values 96.04%, 96.84%, 94.71%, 96.32%, 96.47%, 95.08%, respectively, when splitter's ports change two seven). magnetic (TM) different structural parameters (namely heights grating ridges h1 h2) TE corresponding 96.62%, 95.23%, 92.81%, 93.11%, 92.99%, 93.19%, respectively. Our results (Table 2) demonstrate that all splitters, irrespective number ports, provide Through rigorous coupled-wave analysis (RCWA), derived fabrication tolerance period, highlights reliability splitters.

Language: Английский

---

Core opportunities for future optical fibers

Journal of Physics Photonics, Journal Year: 2021, Volume and Issue: 3(4), P. 041001 - 041001

Published: July 19, 2021

Abstract Hair-thin strands of glass, intrinsically transparent and strong, which many millions kilometers are made annually, connect the world in ways unimaginable 50 years ago. What could another bring? That question is theme this Perspective. The first optical fibers were passive low-loss conduits for light, empowered by sophisticated sources signal processing; a second advance was addition dopants utilizing atomic energy levels to promote amplification, third major initiative physical structuring core-clad combinations, using baseline silica material. Recent results suggest that next expansions fiber performance devices likely utilize different materials core, inhomogeneous structures on length scales, or some combination these. In particular, with crystalline cores offer an extended transparency range strong nonlinearities open door hybrid opto-electronic devices. Opportunities future derive from micro- macro-structuring core phase unique possibilities ‘scattering design’.

Language: Английский

---

Bosonic indistinguishability-dependent contextuality

Physical review. A/Physical review, A, Journal Year: 2022, Volume and Issue: 105(1)

Published: Jan. 3, 2022

Producing contextual correlations in sequences of measurements on single quantum systems faces two major problems. One is the experimental difficulty performing ideal high-dimensional systems, a problem that also affects other forms temporal correlations. The simulability with classical light existing contextuality experiments photons. Here, we introduce scheme solves both We show that, by encoding information $n\ensuremath{\ge}2$ indistinguishable bosons $m\ensuremath{\ge}2$ modes, targeting observables exploiting bunching-antibunching bosons, and dispersively coupling these auxiliary qubits, it possible to realize sequential produce which cannot be simulated light, as relies indistinguishability higher-order interference.

Language: Английский

---

Efficient generation of polarization-entangled photons in metal-organic framework waveguides

Optics Express, Journal Year: 2024, Volume and Issue: 32(17), P. 29514 - 29514

Published: July 23, 2024

Parametric nonlinear optical processes are instrumental in quantum technology for generating entangled light. However, the range of materials conventionally used producing photons is limited. Metal-organic frameworks (MOFs) have emerged as a novel class with customizable properties and proven chemical stability. The large number combinations metal atoms organic ligand from which bulk MOF crystals known to form, facilitates search promising candidates optics. To accelerate discovery next-generation light sources, we employ multi-scale modeling approach study phase-matching conditions collinear degenerate type-II spontaneous parametric down conversion (SPDC) MOF-based one dimensional waveguides. Using periodic-density-functional theory calculations compute selected zinc-based crystals, predict polarization-entangled pair generation rates order 10

Language: Английский

---

Generating bound-entangled states using multicore fibres

Published: July 14, 2024

Language: Английский

---

Entanglement manipulation through multicore fibres

Physica Scripta, Journal Year: 2024, Volume and Issue: 99(11), P. 115117 - 115117

Published: Oct. 8, 2024

Abstract Multicore fibres are recently gaining considerable attention in the context of quantum communication, where their capability to transmit multiple states along different cores same channel makes them a promising candidate for implementation scalable networks. Here, we show that multicore can be effectively used not only scope communication but also manipulation entangled states. Exploiting formalism completely positive trace-preserving maps, describe action fibre as and investigate propagation transmitted state under effect decoherence inter-core crosstalk. Then, propose novel protocol entanglement where, starting from maximally two qudits, use create new families mixed Notably, presence crosstalk is fundamental generation such

Language: Английский

---

Adaptive-Step Perturb-and-Observe Algorithm for Multidimensional Phase Noise Stabilization in Fiber-Based Multi-Arm Mach–Zehnder Interferometers

Algorithms, Journal Year: 2024, Volume and Issue: 17(12), P. 534 - 534

Published: Nov. 21, 2024

Fiber-optic Mach–Zehnder interferometers are widely used in research areas such as telecommunications, spectroscopy, and quantum information. These optical structures known to be affected by phase fluctuations that usually modeled multiparametric noise. This multidimensional noise must stabilized or compensated for enable fiber-optic architectures practical applications. In this work, we study the effectiveness of a modified Perturb-and-Observe (P&O) algorithm control fiber-based multi-arm interferometers. We demonstrate feasibility stabilizing numerical simulations using simple feedback scheme analyze algorithm’s performance systems up dimension 8×8. achieved minimal steady-state errors guarantee high visibility complex with N×N matrices (with N=[2,3,4,5,6,7,8]).

Language: Английский

---

Maximizing quantum discord from interference in multi-port fiber beamsplitters

npj Quantum Information, Journal Year: 2021, Volume and Issue: 7(1)

Published: Dec. 16, 2021

Abstract Fourth-order interference is an information processing primitive for photonic quantum technologies, as it forms the basis of controlled-logic gates, entangling measurements, and can be used to produce correlations. Here, using classical weak coherent states inputs, we study fourth-order in 4 × multi-port beam splitters built within multi-core optical fibers, show that correlations, form geometric discord, controlled maximized by adjusting intensity ratio between two inputs. Though these are separable, they maximize discord some instances, a resource protocols such remote state preparation. This should contribute exploitation correlations future telecommunication networks, particular those exploit spatially structured fibers.

Language: Английский

---