I have just started googling/youtubeing black holes. One point made repeatedly discussed is the loss of information in black holes. In particular quantum bits. What I have not yet found is very much explanation of what these potentially lost bits might be. So what I would like to know is the following: A photon gets sucked into a black hole. How many bits of information is in that photon? What are those bits - one bit for position, one for momentum, one for phase ...???? What I would like is for someone to enumerate the specific bits of information that a photon inside a black hole would consist of - number and kind. I follow the argument that what happens in a black hole can't be conveyed in the usual way outside of the black hole though I understand there are theories where events in the black hole can be somehow seen outside of the black hole - radiation, holographic - communication. However putting those aside, what I am not quite following is what does lost mean? Is it equivalent to not being able to see what is going on inside a black hole or conversely the processes in the black hole can't get out so they can't be be seen outside of the black hole? It seems to me that with virtual photons being created and annihilated out of the vacuum outside of a black hole if you aren't there just in time you might not see the process so information would be lost in that situation too? Or not? If not why is this information not lost as well? The final point made in my various sources is that quantum mechanics has some kind of problem with lost information - it seems to exclude the possibility at its very core. I am not sure what that means. Does it mean that anything quantum has to be 'seen' by its very nature to in fact be quantum? If it's not seen then it can't be truly quantum? What quantum rule/core concept is violated/contradicted if quantum information is lost? Is it tied up with some kind of measurement issue - if you start out with some combo x - potential energy and kinetic energy - you can do a lot of things but you can't change the total energy? So in the world outside of the black hole you have some immense global number of quantum particles/quantum states of such particles - a lot of quantum bits - and no matter what happens in this 'outside the black hole universe' you should always end up with the same global number of bits though they may be distributed in endless variations. Thus if something goes into a black hole this number of bits is decreased and 'quantum mechanics' is broken. So one photon going into the black hole kills quantum mechanics because we can't 'see' it anymore, it can't communicate what it's doing - the states it's in, the bits of those states - it's the same as if it didn't exist? Any assistance in clearing this up is appreciated.