It's not like Alice's photon somehow transmits an "I've been observed as H polarized" message to Bob's photon. These "both alive and dead" and "mixture of H and V" statements are euphemisms for "Unknown".
That is, unless I'm missing something fundamental. Apparently, because that is in a way what is going on:
The both 'alive and dead' IS NOT an euphemism for unkown... A single system can be in a superposition of two states. In this case we are talking about a single system consisting of two photons.
Measuring the state in a certain base on one side WILL collapse the wavefuntion of the entangled pare.
See for example also the 'wheelers delayed choise experiment':
http://en.wikipedia.org/wiki/Wheeler's_delayed_choice_experiment
However, even if the system is 'pushed' into one of the eigenstates of the measurement machine, it can still not be used to transmit information faster then light.
I mean seriously. If you can't figure out how maybe modifying the Linux kernel into your product means you have some obligations to follow vis-a-vis this free OS kernel you just picked up, and how this doesn't affect all the code you wrote that has nothing to do with the kernel... Then you are an idiot, your company deserves to fail, and I can only hope that your fear of using GPL software puts you at a competitive disadvantage and thus hastens that day. I was actually really amazed that Skype was doing this... (I mean, how dumb can you be ?)
They lost the case last year, and now they argued that the whole GPL is invalid...
It sounds more like a 5-year old not getting what he wants and then making a scene...
Luckily the judge ' convinced' them....
Good work !
Ok, my comment was just a general comment anout quantum information. If one (quantum) bit has two levels, than N qubits have 2^N levels.
This is a rather large number. The state of the system ( if there is entanglement bewteen the qubits ) can only be described by 2^N variables, whereas classical you need only in the order of N variables.
As a quantum bit, one can use f.e. atoms, but also Josephson junction circuits, like flux qubits or the cooperpair box, or the spin of an electron trapped in a quantum dot.
This is not the case; Actually the information needed to describe a system of let's say N atoms grows exponentially. So you don't need that much atoms, or Josephson junction circuits at all...
see
http://www.doc.ic.ac.uk/~nd/surprise_97/journal/vo l4/spb3/
for a short introduction.
Slashdot Mirror
Well, you can still switch to Gentoo.
The both 'alive and dead' IS NOT an euphemism for unkown... A single system can be in a superposition of two states. In this case we are talking about a single system consisting of two photons. Measuring the state in a certain base on one side WILL collapse the wavefuntion of the entangled pare. See for example also the 'wheelers delayed choise experiment': http://en.wikipedia.org/wiki/Wheeler's_delayed_choice_experiment
However, even if the system is 'pushed' into one of the eigenstates of the measurement machine, it can still not be used to transmit information faster then light.
You entangle 2 photons, f.e. by creating them at the same time from the same decay-process.
Ok, my comment was just a general comment anout quantum information. If one (quantum) bit has two levels, than N qubits have 2^N levels. This is a rather large number. The state of the system ( if there is entanglement bewteen the qubits ) can only be described by 2^N variables, whereas classical you need only in the order of N variables. As a quantum bit, one can use f.e. atoms, but also Josephson junction circuits, like flux qubits or the cooperpair box, or the spin of an electron trapped in a quantum dot.
This is not the case; Actually the information needed to describe a system of let's say N atoms grows exponentially. So you don't need that much atoms, or Josephson junction circuits at all... see http://www.doc.ic.ac.uk/~nd/surprise_97/journal/vo l4/spb3/
for a short introduction.