Extraction of information from a single quantum

Abstract

We investigate the possibility of performing quantum tomography on a single qubit with generalized partial measurements and the technique of measurement reversal. Using concepts from statistical decision theory, we prove that, somewhat surprisingly, no information can be obtained using this scheme. It is shown that, irrespective of the measurement technique used, extraction of information from single quanta is at odds with other general principles of quantum physics.

5 pages, 1 figure

References in corpus (5)

• Undoing a weak quantum measurement of a solid-state qubit
• Interaction-free measurements with superconducting qubits
• Uncollapsing the wavefunction by undoing quantum measurements
• Generalized partial measurements
• A quantum no-reflection theorem and the speeding up of Grover's search algorithm

Cited by in corpus (5)

• Protecting quantum states from decoherence of finite temperature using weak measurement
• Quantum simulation of parity-time symmetry breaking with a superconducting quantum processor
• Enhancing robustness of multiparty quantum correlations using weak measurement
• Unlearning Quantum Information
• Ontology and Quantum Mechanics