In an earlier post I had discussed quantum computing is of a different league than digital computing. Today’s computers, like a Turing machine, work by manipulating bits that exist in one of two states: a 0 or a 1. Quantum computers aren’t limited to two states; they encode information as quantum bits, or qubits, which can exist in superposition. Having qubits means it has an inherent parallelism. It is this property that allows a quantum computer to work on a million computations at once, while your desktop PC works on one.
Let me quote the In Scientific American was news: Physicists have now shown how to encode three quantum bits, the kind of data that might be used in the computers of tomorrow, using just two photons. (For those who think science is not of interest may skip over to the second section)
Let me refresh about computer memory from my previous post. Atoms, ions, photons or electrons and their respective control devices are working together to act as computer memory and processor. It is vital to compress data lest it should clog up the hard drive resulting in the Internet traffic to slow down. In classical computing a series of any number of identical bits encodes essentially the same information as just one bit. For quantum objects, however, this is not the case. Because in quantum computing same measurement made on distinct, but identically prepared, qubits will yield a range values. As such, accurately recording the quantum state of just one qubit involves taking measurements of multiple identical copies and averaging the results. Now, a group of physicists in Canada has shown for the first time that it is possible to compress the kind of data that might be used in the computers of tomorrow — known as quantum bits, or qubits.
For example, if three qubits can each be in a superposition of 0 and 1, measuring them would yield eight possible outcomes: 000, 001, 010, 011, 100, 101, 110 or 111. But for the averaged measurements there are just four options: 0, 1/3, 2/3 or 1. For instance, 001 yields (0+0+1)/3 = 1/3, as do 010 and 100 (the same digits, but in a different order); 110 yields (1+1+0)/3 = 2/3, just as 101 and 011 do.
Because the qubits are identical, the extra information in the ordering can be simply discarded, say the researchers. To make the point, Steinberg draws a classical-physics analogy. “Keeping all of the information,” he says, “is like storing the complete works of Shakespeare just to find out the average rates at which letters are used in the English language.” The results are due to appear in Physical Review Letters.
When St. Paul writes to the Church of Corinth he writes about Moses leading the children of Israel through the wilderness. He gives the Hebraic account an altogether new twist. He explains the significance of manna and the Rock. In the books of Moses we read he as commanded of God, smote the Rock that supplied water to satisfy their thirst. Paul adds, “for they drank of that spiritual Rock that followed them: and that Rock was Christ (1Cor.10:4) Here is an example of superposition in which the coming of Jesus and his ministry was foretold. If it was divine will in the manner the children of Israel had to agree with other aspects of God’s purpose for the gentile nations. After all God promised Abraham thus,” in thee all families of the earth be blessed.” Gen.12.3
Read Full Post »