Superconducting circuits are a promising tool for quantum computing, and now researchers have performed a Bell test to verify that the qubits they use are truly entangled
For the first time, a superconducting circuit has passed a Bell test, the premier test in physics to confirm a system’s quantum behaviour. These circuits are used in quantum computers, and this test proves that their quantum bits are trulyWhen two particles are entangled, measuring the characteristics of one instantly affects the measured characteristics of the other in what is called a non-local correlation.
Bell tests have been performed in many systems, but never on a superconducting circuit. For the test, the two entangled systems have to be far enough apart that a signal could not have travelled between them at the speed of light in the time it takes to measure both systems. This is difficult to test in a superconducting circuit, because the whole thing has to be kept at temperatures close to
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