University of Stuttgart Deploys Quantum Dot QKD Link Using Frequency Conversion Over Campus Fiber

quantumcomputingreport.com Nov 1, 2026

University of Stuttgart Deploys Quantum Dot QKD Link Using Frequency Conversion Over Campus Fiber

Curated by Shubham · TechCapsules · Nov 1, 2026

AI-summarised brief · reviewed before publication

The University of Stuttgart, together with Saarland University and Leibniz IFW Dresden, demonstrated an entanglement‑based BBM92 QKD link using photons from an epitaxial quantum dot after frequency conversion. Operating at a 1 GHz excitation rate over a 1.59 km campus fiber, the system produced 14.2 Mbit of secure key, which encrypted an image with a one‑time pad. Unlike conventional QKD that relies on attenuated lasers or SPDC sources, the quantum‑dot emitter provides deterministic, sub‑Poissonian photons but emits outside telecom bands. The team coupled a GaAs quantum dot to a polarization‑preserving Sagnac frequency converter, shifting one photon of each entangled pair into the low‑loss telecom window while preserving polarization correlations. Over 19 hours the Stokes parameters stayed above 0.995, showing quantum‑dot sources can serve networks.

💡 Why It Matters

· Demonstrating deterministic, telecom‑compatible quantum‑dot emitters proves a scalable path for secure city‑wide quantum communications.

Capsules Quantum Computing

Read full article on quantumcomputingreport.com

Quantcore Welcomes Innovation Minister to Showcase Manufacturing Ambitions

Scotland’s Innovation Minister Alyn Smith visited Quantcore’s Glasgow facilities to assess how government policy can accelerate the nation’s quantum manufacturing sector. CEO Dr. Jack Brennan led a tour of the company’s superconducting quantum hardware labs, introducing co‑founder and Head of Engineering Wridhdhisom Karar, measurement engineer Daniel Kuznesof and design engineer Dr. Shilpi Pandey. After the walkthrough, Smith joined Quantcore and the University of Glasgow’s Economic Development and Innovation team for a roundtable on deep‑tech infrastructure and talent pipelines. The discussion highlighted the need for post‑spin‑out support and announced Quantcore’s inaugural quantum apprenticeship programme, launching next year in partnership with the Glasgow Riverside Innovation District. Smith praised the world‑leading work and urged scaling of jobs, skills and manufacturing in Scotland now.

💡 Quantcore’s apprenticeship model fast‑tracks skilled labor into quantum hardware production, giving Scotland a home‑grown workforce as rivals race to commercialise the technology.

thequantuminsider.com · Nov 2

Nobel Laureate John Martinis to Deliver Quantum Computing Lecture at UWA

Professor John Martinis, a 2025 Nobel laureate in physics, will give a free public lecture at the University of Western Australia on November 10. The talk will trace four decades of quantum‑computing research, focusing on superconducting qubits and how semiconductor manufacturing and systems engineering can enable scalable machines. Martinis will recount his PhD experiments from the mid‑1980s, his work at Google that led to the 2019 quantum‑supremacy demonstration, and his recent venture Qolab, which aims to commercialise superconducting processors. He also holds the London Prize (2014) and the John Stewart Bell prize (2021). The event, part of the Forrest Research Foundation Distinguished Visiting Researcher program, is open to the public with registration required and will be streamed online for wider access.

💡 Martinis’ Nobel‑level insight directly into Australia gives local researchers and industry a rare blueprint for turning quantum theory into market‑ready hardware.

thequantuminsider.com · Nov 2

Scottish Widows Targets Quantum Computing With UK Venture Growth Investments

Scottish Widows, the UK workplace‑pension provider owned by Lloyds Banking Group, is channeling members’ savings into a venture‑growth portfolio managed by IP Group. The first allocations will target Oxford Quantum Circuits and Quantum Motion, two quantum‑computing start‑ups, alongside battery firm Nyobolt and AI‑driven health‑tech company Genomics Limited. Aberdeen Investments appointed IP Group to run the portfolio within the CG Scottish Widows Growth long‑term asset fund, aiming to supply “follow‑on” capital for British firms ready to commercialise technology and scale. The move seeks to improve retirement outcomes while addressing a financing gap that the provider says hampers the UK’s innovation economy. The default pension options will automatically expose members to the private‑markets sub‑fund, with exposure ranging from 11% to 23%.

💡 By linking pension cash to high‑growth tech, Scottish Widows creates a domestic source of patient capital that could accelerate the UK’s transition from lab breakthroughs to market‑ready products.

quantumcomputingreport.com · Oct 31

IBM Launches Unified Quantum Safe Software Suite to Automate Enterprise PQC Migration

IBM announced the commercial release of its Unified Quantum Safe software suite at TechXchange, aligning with NIST’s final migration roadmap (IR 8547). The platform combines strategic assessment, automated source‑code discovery, and dynamic network mediation to help enterprises and government agencies transition to post‑quantum cryptography (PQC) before the 2030 federal deadline. IBM tested the tool internally, scanning 47 million lines of code across 5,815 repositories and finding 3,900 cryptographic issues. The suite offers automated Cryptography Bill of Materials generation and a network‑level proxy to mitigate “harvest now, decrypt later” exposure.

💡 By automating the identification of vulnerable public‑key dependencies, IBM’s solution reduces the manual effort that has stalled PQC adoption, enabling organizations to meet looming federal mandates and protect data against future quantum threats.

quantumcomputingreport.com · Oct 31

Los Alamos and QC Ware Model Correlated Iron Oxides Using Sample-Based Quantum…

Researchers at Los Alamos National Laboratory and QC Ware published a preprint demonstrating a hybrid quantum-classical workflow that accurately models strongly correlated iron oxides. Using sample‑based quantum diagonalization (SQD) on IBM’s ibm_miamisystem, they combined ab initio‑derived tight‑binding Hamiltonians with a one‑layer Local Unitary Cluster Jastrow ansatz. The approach bypassed VQE barren plateaus by optimizing circuit parameters classically and sampling on the QPU. For FeO, the method achieved chemical accuracy, predicting the experimental quintet state with an excitation energy of 2,167 cm⁻¹, far surpassing previous multireference benchmarks.

💡 The technique shows how near‑term quantum hardware can tackle materials that defy conventional density functional theory, opening a path to simulate real‑world Mott insulators.

quantumcomputingreport.com · Oct 31

Chalmers University Demonstrates Hardware-Level Microwave Crosstalk Suppression via Parasitic Capacitance Engineering

Physicists at Chalmers University of Technology demonstrated a new layout technique that eliminates classical microwave drive crosstalk in superconducting processors by engineering on‑chip parasitic capacitances. The preprint shows that crosstalk suppression arises from multi‑path destructive interference among parasitic capacitive channels, not from cancelling exchange coupling. Using a test chip with two floating transmons and a tunable coupler, the team found the optimal crosstalk‑null frequency 300 MHz away from the Jeff = 0 point. Floating transmons offer lithographic flexibility, and the method aligns classical crosstalk nulls with quantum ZZ nulls at the same flux bias.

💡 By decoupling crosstalk suppression from exchange coupling, the technique sidesteps stringent fabrication tolerances, enabling more reliable scaling of multi‑qubit superconducting circuits.