Quantum computing hardware

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Qubit readout and control Trapped-ion qubits Superconducting qubits Topological qubits Photonic quantum computing Dilution refrigerators Neutral-atom qubits Silicon spin qubits Cryogenic electronics

Silicon spin qubits built in an ordinary CMOS foundry How do you measure a qubit without collapsing the state you need? Why is two qubit gate fidelity the number that decides whether scaling works? Cryo-CMOS control chips that run at 4 kelvin instead of room temperature racks Josephson junction yield is what limits superconducting qubit production Feeding thousands of coax cables into a dilution refrigerator without warming it Photonic qubits work at room temperature but the losses pile up Do trapped ion machines really trade cryogenics for vacuum chambers and lasers? Thousands of physical qubits per logical qubit: what does error correction really cost? Why do superconducting qubits need a dilution refrigerator colder than deep space? Surface codes vs cat codes: which error correcting scheme scales better? Cooling power at the mixing chamber of a dilution fridge caps usable qubit count What does a dilution refrigerator cost and how long is the lead time? Infrared noise leaking into the cryostat and wrecking qubit coherence

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