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Trapped-ion qubits: one real atom, doing two jobs
Strip one electron off an atom, hang it in nothing on an electric field oscillating millions of times a second, and you get the most accurate qubit in the business — and a single speck of matter that is, at once, a quantum memory good for minutes, a processor with all-to-all wiring, and a node that can fire its state down a fiber.
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Superconducting qubits: the circuit that fakes an atom
Cool a printed-circuit chip colder than deep space and it starts impersonating an atom — here is how that fake atom became quantum computing's loudest, fastest, most milestone-heavy front-runner, and what it still cannot do.
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Photonic qubits: computing with light that barely interacts
Write a qubit on a single photon and it flies down an optical fiber for free — the perfect quantum-network messenger. The catch is the same property that makes it fly: photons barely touch each other, so making two of them do a logic gate means abandoning the circuit model and computing by measurement. Here is how light became the field's best wire and its most awkward computer.
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Other qubit platforms: silicon spins, diamond defects, and a qubit that may not exist
Beyond the big four lies a scrappier crowd of qubits, each betting everything on one breakthrough the front-runners cannot reach: a spin in silicon you could mass-produce on a chip line, a flaw in diamond born to network, and a Majorana quasiparticle that would protect itself in hardware — if it turns out to exist at all. A survey of the contenders still in the race.
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Neutral-atom qubits: a thousand atoms in a lattice of light
Pinch a neutral atom in nothing but focused light, split one laser into thousands of those pinches, then rearrange the atoms like a board game — here is how the LEGO of quantum computing went from a trapping trick to the platform now leading on sheer qubit count and error-corrected logical qubits, and the slippery costs it pays for the lead.
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How to build a quantum computer: five ways to make a qubit
There is no single best way to build a qubit — only five very different bets, each acing part of the same scorecard and flunking the rest; here is the map that ties the whole series together.
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Agentic networks: many AI agents that learn and act together
A 5-minute primer on what agentic networks are, why they matter, how they work — and the algorithmic questions my group works on.
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Quantum networks: moving qubits and entanglement, not bits
A 5-minute primer on what quantum networks are, why they matter, how they work — and the algorithmic questions my group works on.