Quantum feedback or quantum feedback control is a class of methods to prepare and manipulate a quantum system in which that system's quantum state or trajectory is used to evolve the system towards some desired outcome. Just as in the classical case, feedback occurs when outputs from the system are used as inputs that control the dynamics (e.g. by controlling the Hamiltonian of the system). The feedback signal is typically filtered or processed in a classical way, which is often described as measurement based feedback. However, quantum feedback also allows the possibility of maintaining the quantum coherence of the output as the signal is processed (via unitary evolution), which has no classical analogue.[1][2][3]
A feedback loop where all outputs of a process are available as causal inputs to that process
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^Nelson, Richard J.; Weinstein, Yaakov; Cory, David; Lloyd, Seth (2 October 2000). "Experimental Demonstration of Fully Coherent Quantum Feedback". Physical Review Letters. 85 (14): 3045–3048. Bibcode:2000PhRvL..85.3045N. doi:10.1103/PhysRevLett.85.3045. PMID 11005999.
^E. Gough, John (2013). "Quantum control and information processing" (PDF). Quantum Information Processing. 12 (Quantum control and information processing): 1397–1415. Bibcode:2013QuIP...12.1397G. doi:10.1007/s11128-012-0491-7. S2CID 254984160.
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I_{j}=O_{j-1},} I 0 = IV . {\displaystyle I_{0}={\text{IV}}.} Output feedback (OFB) Each output feedback block cipher operation depends on all previous ones, and...
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