We're in the vacuum tube stage of the semiconductor revolution but in quantum
If two probabalistic events such as two coin tosses are independent then the probability of two specific events such as 2 heads is the product of the two seperate events: If a set of events can not be factored like this then they are not independent events. In quantum mechanics if this occurs then the events are said to be entangled..
An attempt at money using quantum mechanics. Saw a note to the effect there is some flaw. IIRC
Presented by Edward Farhi. Money, either in the form of bills or information on a computer, should be impossible to copy and also verifiable as good money when tendered to a merchant. Quantum mechanics may make this possible to achieve with far greater security than can be achieved without quantum mechanics. Quantum money is a cryptographic protocol in which a mint can produce a quantum state, no one else can copy the state, and anyone (with a quantum computer) can verify that the state came from the mint without sending the money back to the mint. I will present a concrete quantum money scheme based on quantum superpositions of diagrams that encode knots. This scheme is hopefully secure against computationally bounded adversaries. This may be the basis of E-commerce on a future quantum internet which would not require communication with a central server such as the credit card company, PayPal or Google Checkout.
