The coherence time of new quantum bits has been extended thousands of times before

Tech 2023-10-30 08:57:10 Source: Network

Science and Technology Daily, Beijing, October 29 (Reporter Liu Xia) In a new study, the Argonne National Laboratory team of the US Department of Energy has extended the coherence time of a new type of quantum bit - charge quantum bit - to 0.1 milliseconds, which is 1000 times the previous record

Science and Technology Daily, Beijing, October 29 (Reporter Liu Xia) In a new study, the Argonne National Laboratory team of the US Department of Energy has extended the coherence time of a new type of quantum bit - charge quantum bit - to 0.1 milliseconds, which is 1000 times the previous record. The relevant paper was published in the latest issue of the journal Nature Physics.

Researchers have stated that their qubits can perform 10000 operations with very high accuracy and speed within this time frame, while traditional electronic charge qubits can only perform 10 to 100 operations within coherent time.

The quantum bits of the Argonne team encode quantum information based on the motion state (charge) of electrons, hence they are called charge quantum bits. They capture individual electrons on the surface of ultra clean solid neon in vacuum. The inert element neon is one of the few elements that does not react with other elements, so it can better cope with the interference of the surrounding environment's "noise", thus ensuring a longer coherence time. Extending from 0.1 microseconds to 0.1 milliseconds allows researchers to control and read the state of individual quantum bits with very high fidelity.

Researchers have pointed out that among the various existing quantum bits, charge quantum bits are highly attractive because they are easy to manufacture and operate, compatible with the existing infrastructure of classical computers, and quantum bits made from them can be better expanded. Therefore, it is expected that large-scale quantum computers of this type will be built and operated at lower costs in the future.

In the latest research, the team has also demonstrated that two charge qubits can be coupled to the same superconducting circuit, allowing information to be transmitted through the circuit, which represents an important step towards the key of quantum computing - the entanglement between two qubits.

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