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Proceedings Paper

Partial entanglement, complementary, and simultaneous measurement of discrete observables
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Paper Abstract

Different quantum information schemes, such as eavesdropping in quantum cryptography, dictate the necessity of extracting information about pair conjugate observables from a single copy of a quantum system. Mathematically, quantum measurements are usually described by an uncertainty relation. The difference between the simultaneous measurement uncertainty relation form those known from the textbooks on quantum mechanics is the additional uncertainty associated with the measurement procedure itself in contrast to the state preparation uncertainties described by the Schroedinger-Robertson type uncertainty relations. We present here an overview of our approach based on the state estimation theory and maximum likelihood strategy. We make a theoretical analysis and an experimental verification of minimum-uncertainty product of the two-states quantum system simultaneous measurement based on partially entangled photon pairs.

Paper Details

Date Published: 1 April 2002
PDF: 11 pages
Proc. SPIE 4750, ICONO 2001: Quantum and Atomic Optics, High-Precision Measurements in Optics, and Optical Information Processing, Transmission, and Storage, (1 April 2002); doi: 10.1117/12.464480
Show Author Affiliations
Alexei Trifonov, A.F. Ioffe Physico-Technical Institute (Russia)
Jonas Soderholm, Royal Institute of Technology (KTH) (Sweden)
Gunnar Bjork, Royal Institute of Technology (KTH) (Sweden)


Published in SPIE Proceedings Vol. 4750:
ICONO 2001: Quantum and Atomic Optics, High-Precision Measurements in Optics, and Optical Information Processing, Transmission, and Storage

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