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One of the key concepts in quantum physics is entanglement, in which two or more quantum systems become so inextricably linked that their collective state can't be determined by observing each element individually. Now Yale researchers have developed a "universal entangler" that can link a variety of encoded particles on demand.
The discovery represents a powerful new mechanism with potential uses in quantum computing, cryptography, and quantum communications. The research is led by the Yale laboratory of Robert Schoelkopf and appears in the journal Nature.
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"We've shown a new way of creating gates between logically-encoded qubits that can eventually be error-corrected," said Schoelkopf, the Sterling Professor of Applied Physics and Physics at Yale and director of the Yale Quantum Institute. "It's a much more sophisticated operation than what has been performed previously."The entangling mechanism is called an exponential-SWAP gate. In the study, researchers demonstrated the new technology by deterministically entangling encoded states in any chosen configurations or codes, each housed in two otherwise isolated, 3-D superconducting microwave cavities.
It's a tangled web we weave, when we're practicing to receive...
(Score: 0) by Anonymous Coward on Thursday February 28 2019, @01:35PM (1 child)
Perhaps just misleading,
It may be true that the collective state can't be determined by observing each individually because, as you point out, there is no such thing as 'observing individually'.
Building a classic computing engine is a game with bits, gates, flops, and wires. The bits are the state representation, gates do the logic, the flops remember things, and the wires specify the problem.
With quantum, the concept of 'remember' may not apply if there is nothing between having the answer and not.
That leaves bits, gates and wires.
These folks seem to have progress in the 'wires' area.
If the gates provide constraints so that a set of bits can only be in a few combinations of states,
I wish the gates progress was good enough so they could show recognizable truth tables.
(Score: 1, Funny) by Anonymous Coward on Thursday February 28 2019, @09:00PM
If a computer only has a flop, how does it encode the second binary state? Can it flip the flop? Or is there a machine in another universe that only has a flip, in which to encode the secondary state it flops the flip?