The reliability of quantum memory has reached a new level




The reliability of quantum memory has reached a new level

Quantum computers are very real , but because of the fragility of quantum information while they are unable to do the same thing as making a normal computers, faster. A team of researchers from the University of Sydney and Dartmouth College found a way to make quantum information more reliable.

“In these systems, superconducting quantum information is preserved only within 100 microseconds – a tiny fraction of a second,” – says Dr. Michael J. Birkuk, director of the Laboratory for quantum control at the University of Sydney School of Physics.

This decay of information is called decoherence. This problem occurs even when the information is in the standby mode. However Birkuk and his colleagues have found a way to keep quantum information for a few hours.

Quantum computing uses the unique properties of quantum particles, creating what is called “qubits” for operations. The researchers believe that this new generation of computers one day be able to solve certain problems in a fraction of a second, and the complexity they will outperform those that are discharged to share today. In this direction, scientists have already achieved some success.

For example, not so long ago, Google and NASA bought a car that was created by the Canadian company D-Wave, which is one of the contenders for the role of the creator working quantum computer. However, many scientists are skeptical of the company, especially in the fact that D-Wave can outperform conventional computers – and even its quantum difficult to call. Others, like IBM, have built a quantum computer based on “paper” ideas, but he did not pass decoherence.

“Construction of a large-scale quantum computer requires the need to store and process quantum information with a very small probability of error” – said Birkuk. In other words, you need a reliable form of quantum memory.

Birkuk company and solve the problem using what is called a quantum repeater that can “enhance” the signal of a part of quantum information. In the past, has created a quantum repeaters, but according Birkuka, the new approach will be more reliable.

Sydney-Dartmouth repeater is based on ytterbium ions. In the process of dynamic decoupling interference occurs, which negates errors. The concept has already been demonstrated experimentally before, but Birkuk empirically found that the theoretical part of the model was limited to how quantum information is often increased. The new method allows access to the information stored in memory at any time, with no chance of damaging it.

Discoveries in the field of quantum memory continues. In March, a group of Yale University has found a way to make quantum information to be recorded at will, but a read-only at any other time.

Birkuk noted that the new method will ultimately be compatible with the other techniques of quantum computation, including the above.

“It takes some improvements in the technology of superconductors for solutions rather unpleasant issues – energy relaxation”, – he said. – “But if this step is overcome, there will be high hopes that our quantum repeaters may well be used in quantum computers of the future.”

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Tags: Quantum mechanics , quantum memory , quantum computers .


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