The quantum bits underwent what Albert Einstein called “spooky action at a distance.”
The test for this quantum effect, Bell’s inequality, sets a limit on the number of occurrences in which particles end up in the same state by chance without an entanglement. By violating Bell’s inequality, this is proof that a pair of particles are actually entangled.
In the past, Bell tests have been carried out in several systems. However, this is the first on a superconducting circuit. For this test, the two entangled systems will be far enough apart so that a signal could not have traveled between them at the speed of light at the same time it takes to measure the systems. This is a daunting task in a superconducting circuit, as the systems must be kept at a temperature close to zero.
Furthermore, they proceeded to use a random number generator to decide the measurement to make on the qubits to eliminate any human bias. Simon Storz and his colleagues made over 4 million measurements at a rate of 12,500 measurements per second. This speed is necessary to ensure that each pair of measurements occurs faster than light could travel down the tube between the two quantum bits.
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