Nonunity gain minimal-disturbance measurement

Nonunity gain minimal-disturbance measurement

Probabilistic minimal disturbance measurement of symmetrical qubit states

R. Filip, L. Mišta, Jr., F. De Martini, M. Ricci, and F. Sciarrino Department of Optics, Palacký University, 17. listopadu 50, Olomouc 772 00, Czech Republic Dipartimento di Fisica, Università di Roma “La Sapienza,” Piazzale Aldo Moro 5, Roma 00185, Italy Centro Studi e Ricerche “Enrico Fermi,” Via Panisperna 89/A Compendio del Viminale, Roma 00184, Italy Received 4 May 2006; published 8 Novemb...

Measurement - Disturbance and Contextuality

Many seemingly paradoxical effects are known in the predictions for outcomes of measurements made on preand post-selected quantum systems. A class of such effects, which we call “logical preand post-selection paradoxes”, bear a striking resemblance to proofs of the Bell-Kochen-Specker theorem, which suggests that they demonstrate the contextuality of quantum mechanics. Despite the apparent simi...

Maximal Accuracy and Minimal Disturbance in the Arthurs-kelly Simultaneous Measurement Process

The accuracy of the Arthurs-Kelly model of a simultaneous measurement of position and momentum is analysed using concepts developed by Braginsky and Khalili in the context of measurements of a single quantum observable. A distinction is made between the errors of retrodiction and prediction. It is shown that the distribution of measured values coincides with the initial state Husimi function wh...

Paradoxes , Measurement - Disturbance and Contextuality

Many seemingly paradoxical effects are known in the predictions for outcomes of measurements made on preand post-selected quantum systems. A class of such effects, which we call “logical preand post-selection paradoxes”, bear a striking resemblance to proofs of the Bell-Kochen-Specker theorem, which suggests that they demonstrate the contextuality of quantum mechanics. Despite the apparent simi...