New Technology Lets Quantum Bits Hold Information for 10,000 Times Longer than Previous Record
Quantum bits, or qubits, can hold quantum information much longer now thanks to efforts by an international research team. The researchers have increased the retention time, or coherence time, to 10 milliseconds – 10,000 times longer than the previous record – by combining the orbital motion and spinning inside an atom. Such a boost in information retention has major implications for information technology developments since the longer coherence time makes spin-orbit qubits the ideal candidate for building large quantum computers.
They published their results on July 20 in Nature Materials.
“We defined a spin-orbit qubit using a charged particle, which appears as a hole, trapped by an impurity atom in silicon crystal,” said lead author Dr. Takashi Kobayashi, research scientist at the University of New South Wales Sydney and assistant professor at Tohoku University. “Orbital motion and spinning of the hole are strongly coupled and locked together. This is reminiscent of a pair of meshing gears where circular motion and spinning are locked together.”
Qubits have been encoded with spin or orbital motion of a charged particle, producing different advantages that are highly demanded for building quantum computers. To utilize the advantages of qubits, Kobayashi and the team specifically used an exotic charged particle “hole” in silicon to define a qubit, since orbital motion and spin of holes in silicon are coupled together.
Spin-orbit qubits encoded by holes are particularly sensitive to electric fields, according to Kobayashi, which allows for more rapid control and benefits scaling up quantum computers. However, the qubits are affected by electrical noise, limiting their coherence time.
“In this work, we have engineered sensitivity to the electric field of our spin-orbit qubit by stretching the silicon crystal like a rubber band,” Kobayashi said. “This mechanical engineering of the spin-orbit qubit enables us to remarkably extend its coherence time, while still retaining moderate electrical sensitivity to control the spin-orbit qubit.”
Think of gears in a watch. Their individual spinning propels the entire mechanism to keep time. It is neither the spin nor orbital motion, but a combination of them that takes the information forward.
“These results open a pathway to develop new artificial quantum systems and to improve the functionality and scalability of spin-based quantum technologies,” Kobayashi said.
The Latest Updates from Bing News & Google News
Go deeper with Bing News on:
Artificial quantum systems
- 12 European Companies and Research Labs Join Forces to Boost Industrial Quantum Computing Applicationson October 5, 2020 at 9:32 am
The NExt ApplicationS of Quantum Computing (NEASQC) project brings together a multidisciplinary consortium of academic ...
- Atos and ECMWF launch Center of Excellence in Weather & Climate Modelling to support researchers with HPC, AI and quantum capabilitieson October 5, 2020 at 1:36 am
Press Release Atos and ECMWF launch Center of Excellence in Weather & Climate Modelling to support researchers with HPC, AI and quantum capabilities London and Reading, UK; Paris, France; Bologna, ...
- Has the artificial leaf’s time come at last?on September 28, 2020 at 6:45 am
So, for example, we said the efficiency – conversion of solar energy into chemical energy – should be 10%. That was just off the top of our head, but it’s been used ever since by a lot of people.’ ...
- ESA’s Φ-Week: Digital Twin Earth, Quantum Computing and AI Take Center Stageon September 27, 2020 at 5:00 pm
ESA’s 2020 Φ-week event kicked off this morning with a series of stimulating speeches on Digital Twin Earth, updates on Φ-sat-1, which was successfully launched into orbit earlier this month, and an ...
- Baidu announces Quantum Leaf, a cloud-based quantum infrastructure serviceon September 23, 2020 at 1:20 pm
China’s Baidu Inc. announced a new cloud-based quantum computing platform called Quantum Leaf today that it says is designed for programming, simulating and executing quantum workloads. Baidu is one ...
Go deeper with Google Headlines on:
Artificial quantum systems
Go deeper with Bing News on:
- The Coding School, IBM Quantum Provide Free Quantum Education to 5,000 Students Around the Worldon October 6, 2020 at 10:32 am
The Coding School is collaborating with IBM Quantum to offer a first-of-its-kind quantum computing course for 5,000 high school students and above, designed to make quantum education globally ...
- Stanford quantum physicist and sociologist awarded MacArthur ‘genius’ grantson October 6, 2020 at 9:29 am
Smith was honored with a MacArthur Fellowship for her creative approach to studying many-particle quantum systems. Forrest Stuart's fellowship recognizes the human approach he brings to the study of ...
- Researchers crack quantum physics puzzleon October 6, 2020 at 5:30 am
Scientists have re-investigated a sixty-year-old idea by an American physicist and provided new insights into the quantum world.
- New algorithm can fast forward quantum simulations to solve problemson October 5, 2020 at 11:01 pm
A new algorithm that fast forwards simulations could bring greater use ability to current and near-term quantum computers, opening the way for applications to run past strict time limits that hamper ...
- New quantum computing algorithm skips past time limits imposed by decoherenceon October 5, 2020 at 2:27 pm
and checking the extent to which they can fast forward systems. The research was published September 18, 2020 in the journal npj Quantum Information.