Researchers from the Institute for Quantum Optics and Quantum Information,
The introduction of this protocol is basedon the previous article published in 2020 . The same team of scientists presented a series of time translation protocols that can be used in uncontrolled conditions. While some were promising, most of the scenarios tested were unlikely to succeed. In a new study, physicists set out to create an alternative protocol with a higher probability of success.
“Our newly developed protocol invertsunitary evolution of the qubit,” said David Trillo, one of the authors of the new work, who conducted the research along with Benjamin Dive and Miguel Navasquez in an interview with Phys.org. — A qubit is a two-level quantum system that serves as the quantum equivalent of the bits used in quantum computers. Any quantum system has some natural evolution over time that needs to be controlled or at least taken into account when designing the physical processes around it. For example, when creating a quantum computer. Our protocol takes a qubit and outputs the same system, but in the state it would have been in had it evolved back in time.”
The protocol created by Trillo and his colleaguesis universal. This means that it applies to any qubit, regardless of its natural evolution over time or what state it is in when using the protocol. By their nature, universal protocols are probabilistic, which means they cannot be successful all the time, but rather promise a certain probability of success.
Initial assessments have shown that universalthe quantum rewind mechanism has a high probability of success. Essentially, the protocol works by setting a target qubit to a superposition of flight paths and then performing a series of quantum operations on it.
"Our protocol works for unmanaged systemsor, in other words, qubits,” Trillo explained. - Its new function is that whenever it fails, we can fix it and bring the system to the desired state. By making these adjustments adaptively, we increase the likelihood of success as high as we want. This occurs due to an increase in the execution time of the protocol.”
“I wonder what other phenomena we can transfer from a controlled environment to an uncontrolled one,” the scientists conclude.
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Cover photo: IBM Five Qubit Processor
Author: IBM Research