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Measurement of an observable on a quantum system involves a probabilisticcollapse of the quantum state and a corresponding measurement outcome. L\"udersand von Neumann state update rules attempt to describe the abovephenomenological observations. These rules are identical for a nondegenerateobservable, but differ for a degenerate observable. While L\"uders rulepreserves superpositions within a degenerate subspace under a measurement ofthe corresponding degenerate observable, the von Neumann rule does not.Recently Hegerfeldt and Mayato [Phys. Rev. A, 85, 032116 (2012)] had formulateda protocol to discriminate between the two types of measuring devices. Here wehave reformulated this protocol for quantum registers comprising of system andancilla qubits. We then experimentally investigated this protocol using nulearspin systems with the help of NMR techniques, and found that L\"uders rule isfavoured.

Discriminating between L\"uders and von Neumann measuring devices: An NMR investigation