| Bram Cohen ( @ 2006-01-12 13:33:00 |
The Quantum Duelist
Pop science accounts of Schrodinger's cat have the infuriating property of rarely ever explaining what the experiment is about and instead give people the impression that quantum mechanics is probability: there is a certain probability that the cat is alive, and another that it's dead.
While it's true that probability is an important concept, and one which both has much more practical implications for the general public than quantum mechanics and is far less widely understood than it ought to be, it most definitely is not a quantum mechanical concept. Probability theory was worked out centuries earlier, and does not imply anything nearly as wacked out as schrodinger's cat.
To explain the bizarre nature of Schrodinger's cat, I will describe the strange case of the Quantum Duelist. Instead of a cat, the Quantum Duelist is a person, although like the cat he goes inside a black box which is left completely sealed for some period of time, and then when the box is opened the quantum state of the contents of the box are forced into a specific value, rather than the multiple interacting values which it has until it interacts with the outside world.
After entering and locking the black box, the Quantum Duelist flips a coin. If it comes up heads, he turns to the right, if it comes up tails, he turns to the left. Either way, he then takes ten paces forwards, turns around, and fires a gun straight ahead.
According to quantum mechanics, after the black box is opened, there's some chance that the duelist will be lying on the floor ten paces to the left, dead from a gunshot between the eyes fired by himself at a distance of twenty paces.
Unsettlingly, experiments clearly demonstrate that individual particles really do behave this way, so we can't dismiss quantum mechanics on the grounds of absurdity.
Pop science accounts of Schrodinger's cat have the infuriating property of rarely ever explaining what the experiment is about and instead give people the impression that quantum mechanics is probability: there is a certain probability that the cat is alive, and another that it's dead.
While it's true that probability is an important concept, and one which both has much more practical implications for the general public than quantum mechanics and is far less widely understood than it ought to be, it most definitely is not a quantum mechanical concept. Probability theory was worked out centuries earlier, and does not imply anything nearly as wacked out as schrodinger's cat.
To explain the bizarre nature of Schrodinger's cat, I will describe the strange case of the Quantum Duelist. Instead of a cat, the Quantum Duelist is a person, although like the cat he goes inside a black box which is left completely sealed for some period of time, and then when the box is opened the quantum state of the contents of the box are forced into a specific value, rather than the multiple interacting values which it has until it interacts with the outside world.
After entering and locking the black box, the Quantum Duelist flips a coin. If it comes up heads, he turns to the right, if it comes up tails, he turns to the left. Either way, he then takes ten paces forwards, turns around, and fires a gun straight ahead.
According to quantum mechanics, after the black box is opened, there's some chance that the duelist will be lying on the floor ten paces to the left, dead from a gunshot between the eyes fired by himself at a distance of twenty paces.
Unsettlingly, experiments clearly demonstrate that individual particles really do behave this way, so we can't dismiss quantum mechanics on the grounds of absurdity.