Coherence seems to be an issue with quantum computing, and not just the bit-tech staff after a night at the pub...
A limit on how long information persists within quantum devices could mean that Quantum computing faces a big problem as researchers try and make workable technology from the lab experiments:
ATTEMPTS to build quantum computers could run up against a fundamental limit on how long useful information can persist inside them. Exceed the limit and information could just leak away, making computation impossible.
“Quantum information will inevitably be lost after a certain time, even without any external disturbance”A quantum computer manipulates stored information in quantum bits, or qubits. Because a qubit can be in two states at the same time, and can be entangled with other qubits, a quantum computer can carry out multiple calculations simultaneously. But the entire system is delicate: during a computation the qubits have to be isolated from their environment, because any outside disturbance can cause "decoherence" and spoil the calculations.
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