Purity versus scrambling: universal laws in quantum systems
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Preparing a quantum system in a pure, well-defined state is essential for quantum computing, simulation and sensing. In practice, however, purification competes with scrambling.
Purification drives a quantum system towards a well-defined pure state, while scrambling spreads its information across the system and makes that purification slower and more difficult.
The compromise is often weak measurement. In general, measurements extract information from a quantum system. In doing so, they also dis
Purification drives a quantum system towards a well-defined pure state, while scrambling spreads its information across the system and makes that purification slower and more difficult.
The compromise is often weak measurement. In general, measurements extract information from a quantum system. In doing so, they also dis
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