Quantum Computing - Department of Computing
... We see that the interference, and hence the oscillation, is due to the last term 2 Re(ψ1∗ (x)ψ2 (x)). But there are yet more surprising facts. Suppose, by placing a light source between the two slits, we try to observe through which slit any electron passes. Then, as expected, the probability distr ...
... We see that the interference, and hence the oscillation, is due to the last term 2 Re(ψ1∗ (x)ψ2 (x)). But there are yet more surprising facts. Suppose, by placing a light source between the two slits, we try to observe through which slit any electron passes. Then, as expected, the probability distr ...
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... The typical classical single-bit error is the bit-flip: 0 ↔ 1. If we assume a simple error model (the binary symmetric channel) in which bit flips errors occur on each bit independently with probablility p per unit time, we expect a bit to be corrupted after O(1/p) steps. (In general, we assume p ≪ ...
... The typical classical single-bit error is the bit-flip: 0 ↔ 1. If we assume a simple error model (the binary symmetric channel) in which bit flips errors occur on each bit independently with probablility p per unit time, we expect a bit to be corrupted after O(1/p) steps. (In general, we assume p ≪ ...
Metric fluctuations and the weak equivalence principle
... fluctuations of spacetime geometry were analysed stemming from quantum fluctuations of matter fields in the context of a semiclassical theory of gravity. This leads to a stochastic behaviour of the metric tensor. Furthermore the effects of fluctuations of spacetime geometry leading to, e.g., lightco ...
... fluctuations of spacetime geometry were analysed stemming from quantum fluctuations of matter fields in the context of a semiclassical theory of gravity. This leads to a stochastic behaviour of the metric tensor. Furthermore the effects of fluctuations of spacetime geometry leading to, e.g., lightco ...
Daniel Dennett`s Compatibilism
... sense of ourselves as responsible free agents, roughly in the following way: I am faced with an important decision to make, and after a certain amount of deliberation, I say to myself: “That’s enough. I’ve considered this matter enough and now I’m going to act,” in the full knowledge that I could ha ...
... sense of ourselves as responsible free agents, roughly in the following way: I am faced with an important decision to make, and after a certain amount of deliberation, I say to myself: “That’s enough. I’ve considered this matter enough and now I’m going to act,” in the full knowledge that I could ha ...
Quantum teleportation
Quantum teleportation is a process by which quantum information (e.g. the exact state of an atom or photon) can be transmitted (exactly, in principle) from one location to another, with the help of classical communication and previously shared quantum entanglement between the sending and receiving location. Because it depends on classical communication, which can proceed no faster than the speed of light, it cannot be used for faster-than-light transport or communication of classical bits. It also cannot be used to make copies of a system, as this violates the no-cloning theorem. While it has proven possible to teleport one or more qubits of information between two (entangled) atoms, this has not yet been achieved between molecules or anything larger.Although the name is inspired by the teleportation commonly used in fiction, there is no relationship outside the name, because quantum teleportation concerns only the transfer of information. Quantum teleportation is not a form of transportation, but of communication; it provides a way of transporting a qubit from one location to another, without having to move a physical particle along with it.The seminal paper first expounding the idea was published by C. H. Bennett, G. Brassard, C. Crépeau, R. Jozsa, A. Peres and W. K. Wootters in 1993. Since then, quantum teleportation was first realized with single photons and later demonstrated with various material systems such as atoms, ions, electrons and superconducting circuits. The record distance for quantum teleportation is 143 km (89 mi).