Quantum Information Processing, Vol. 5, No. 6, December 2006 (© 2006)
The Multifarious Quantum Information
Received October 29, 2005; accepted January 15, 2006; Published online October 24, 2006
This paper considers the scope and possibilities of quantum information within the
consensus interpretation of the theory. It is pointed out that a prepared quantum state
offers a multitude of answers determined by the query directed to it. It predicts the
outcome of measurements of alternative observations or allows the performance of
a selection of quantum information processes. Knowing the state does not determine
which observables can be assigned values, but deﬁning a point of view of the observer
allows him to derive outcomes of measurements. However, all predictions are in the
form of statistical distributions or correlations between observations. Thus they are
intrinsically independent of separations in space and time: like all statistical knowl-
edge they have to be reassessed when new infomation imposes a new initial state. Many
properties determined by quantum observations must be assigned to the results of the
measurements and not to the physical system itself. Thus the property of nonlocality is
a consequence of the probabilistic interpretation only, and it corresponds to no feature
assigned to the physical reality.
KEY WORDS: Quantum information; conditional predictions; nonlocality;
PACS: 03.67.-a; 03.65.Ud; 03.67.Hk; 03.67.Lx.
“Die Welt ist meine Vorstellung:” – dies ist eine Wahrheit, welche in Beziehung
auf jedes lebende und erkennende Wesen gilt; wiewohl der Mensch allein sie in
das reﬂektierte abstrakte Bewuβtseyn bringen kann; und thut er dies wirklich; so
ist die philosophische Besonnenheit bei ihm eingetreten.
According to quantum theory, as we know it, the state vector of a phys-
ical system characterizes its existential status. All contingent attributes of
its being are captured in this state, and only vectors that can be prepared
Physics Department, KTH, Stockholm, Sweden. E-mail: firstname.lastname@example.org
Laboratory of Computational Engineering, HUT, Espoo, Finland.
1570-0755/06/1200-0481/0 © 2006 Springer Science+Business Media, Inc.