An article in The Economist regarding quantum computing says that:
- Subatomic particles can have more than one value at the same time
- Having more than one value (like being 0 and 1 simultaneously) is called "superposition"
- Qubits (quantum computing bits) can be in four different states at once.
- Quantum Dots are confined clouds of electrons
- Superposition is NOT simple
- When things that have superposition interact with the "classical" world, the larger world, they become "decoherent"
- Decoherence can be combated using bang-bang pulses. This also helps maintain entanglement.
- Quantum computing has a tolerance for faults caused by spontaneous emissions.