The Quantum Investor's Notebook: Weekly Publications https://www.quantuminvestornotebook.com/ A physicist-investor's notebook on quantum computing that translates technical progress into investor-relevant judgment. en-us Sat, 24 Oct 2026 12:00:00 GMT Sat, 24 Oct 2026 12:00:00 GMT https://www.rssboard.org/rss-specification https://www.quantuminvestornotebook.com/Images/apple-touch-icon.png The Quantum Investor's Notebook: Weekly Publications https://www.quantuminvestornotebook.com/ Rented, tested, linked https://www.quantuminvestornotebook.com/Publications/2026-10-17-to-2026-10-23 https://www.quantuminvestornotebook.com/Publications/2026-10-17-to-2026-10-23 Weekly quantum research for October 17 to 23, 2026: below-threshold error correction on a rented IBM chip by outside researchers, with Quantinuum's color code for scale; reality checks on quantum advantage, from BosonSampling under photon loss to classical post-processing of QuEra's Aquila; and links between machines from 80 centimeters to 17 kilometers. Sat, 24 Oct 2026 12:00:00 GMT Weekly Publications More qubits, harder control https://www.quantuminvestornotebook.com/Publications/2026-10-10-to-2026-10-16 https://www.quantuminvestornotebook.com/Publications/2026-10-10-to-2026-10-16 A 1,265-ion crystal under coherent control, encoded addition that beats its physical circuit but discards attempts, second-long defect lifetimes, deterministic photon fusion and AI-designed quantum arithmetic. Sat, 17 Oct 2026 12:00:00 GMT Weekly Publications The cost of connecting quantum components https://www.quantuminvestornotebook.com/Publications/2026-10-03-to-2026-10-09 https://www.quantuminvestornotebook.com/Publications/2026-10-03-to-2026-10-09 A tenfold leaner memory from wired-together modules, error correction around a chip’s weak spots, a kilohertz link between two qubit technologies, and the real price of a usable magic state. With selected research from Google, IBM and IonQ. Sat, 10 Oct 2026 12:00:00 GMT Weekly Publications Break-even, dequantization and the control stack https://www.quantuminvestornotebook.com/Publications/2026-09-26-to-2026-10-02 https://www.quantuminvestornotebook.com/Publications/2026-09-26-to-2026-10-02 A claimed chemistry break-even on 120 qubits, a new classical-sampling limit for noisy unital circuits, and spin-qubit initialization without local reservoirs. With selected research from IBM, QuEra and RIKEN. Sat, 03 Oct 2026 12:00:00 GMT Weekly Publications Advantage, codes and the burden of proof https://www.quantuminvestornotebook.com/Publications/2026-09-19-to-2026-09-25 https://www.quantuminvestornotebook.com/Publications/2026-09-19-to-2026-09-25 A quantum advantage claim run through a standard cloud queue, a fast-moving front in new error-correcting codes, and error correction moving into the hardware stack. With selected research from BlueQubit on IBM hardware, MIT and a photonic processor in orbit. Sat, 26 Sep 2026 12:00:00 GMT Weekly Publications Manufacturing, memory and the work of deployment https://www.quantuminvestornotebook.com/Publications/2026-09-12-to-2026-09-18 https://www.quantuminvestornotebook.com/Publications/2026-09-12-to-2026-09-18 Wafer-scale statistics, a 90% optical memory and quantum signals sharing fiber with 10 Gbps traffic: this week’s research made deployment constraints measurable. With selected research from the University of Illinois, LuxQuanta and IBM. Sat, 19 Sep 2026 12:00:00 GMT Weekly Publications Control, algorithms and the work of scaling https://www.quantuminvestornotebook.com/Publications/2026-09-05-to-2026-09-11 https://www.quantuminvestornotebook.com/Publications/2026-09-05-to-2026-09-11 The systems around the qubit come into focus: control, the cost of quantum algorithms, and the connections needed to scale. With selected research from IBM, NTT, and JPMorgan Chase. Mon, 14 Sep 2026 12:00:00 GMT Weekly Publications