It seems to me that we must make a distinction between what is "objective" and what is "measurable" in discussing the question of physical reality, according to quantum mechanics. The state-vector of a system is, indeed, not measurable, in the sense that one cannot ascertain, by experiments performed on the system, precisely (up to proportionality) what the state is; but the state-vector does seem to be (again up to proportionality) a completely objective property of the system, being completely characterized by the results it must give to experiments that one might perform.
Roger PenroseRelated topics
might measurable mechanics objective property quantum question sense stateRelated quotes
Thee might observe incidentally that if the state paid for child-bearing it might and ought to require a medical certificate that the parents were such as to give a reasonable result of a healthy child – this would afford a very good inducement to some sort of care for the race, and gradually as public opinion became educated by the law, it might react on the law and make that more stringent, until one got to some state of things in which there would be a little genuine care for the race, instead of the present haphazard higgledy-piggledy ways.
Bertrand Russell
So here's a question from one who believed, only a week ago, that Baghdad might just collapse, that we might wake up one morning to find the Baathist militia and the Iraqi army gone and the Americans walking down Saadun Street with their rifles over their shoulders. If the Iraqis can still hold out against such overwhelming force in Umm Qasr for four days, if they can keep fighting in Basra and Nassariyeh - the latter a city which briefly rose in successful revolt against Saddam in 1991 - why should Saddam's forces not keep fighting in Baghdad?
Robert Fisk
To me, I took a militant attitude towards sounds. I wanted sounds to be a metaphor, that they could be as free as a human being might be free. That was my idea about sound. It still is, that they should breathe ... not to be used for the vested interest of an idea. I feel that music should have no vested interests, that you shouldn't know how it's made, that you shouldn't know if there's a system, that you shouldn't know anything about it ... except that it's some kind of life force that to some degree really changes your life ... if you're into it.
Morton Feldman
For those who believe in God, most of the big questions are answered. But for those of us who can't readily accept the God formula, the big answers don't remain stonewritten. We adjust to new conditions and discoveries. We are pliable. Love need not be a command nor faith a dictum. I am my own god. We are here to unlearn the teachings of the church, state and our educational system. We are here to drink beer. We are here to kill war. We are here to laugh at the odds and live our lives so well that Death will tremble to take us.
Charles Bukowski
Ironically, conventional quantum mechanics itself involves a vast expansion of physical reality, which may be enough to avoid Einstein Insanity. The equations of quantum dynamics allow physicists to predict the future values of the wave function, given its present value. According to the Schrödinger equation, the wave function evolves in a completely predictable way. But in practice we never have access to the full wave function, either at present or in the future, so this "predictability” is unattainable. If the wave function provides the ultimate description of reality - a controversial issue!
Frank Wilczek