New! Sign up for our free email newsletter.
Science News
from research organizations

A new design for quantum computers

Date:
February 15, 2024
Source:
Delft University of Technology
Summary:
Creating a quantum computer powerful enough to tackle problems we cannot solve with current computers remains a big challenge for quantum physicists. A well-functioning quantum simulator -- a specific type of quantum computer -- could lead to new discoveries about how the world works at the smallest scales. Quantum scientists have developed a guide on how to upgrade these machines so that they can simulate even more complex quantum systems.
Share:
FULL STORY

Creating a quantum computer powerful enough to tackle problems we cannot solve with current computers remains a big challenge for quantum physicists. A well-functioning quantum simulator -- a specific type of quantum computer -- could lead to new discoveries about how the world works at the smallest scales. Quantum scientist Natalia Chepiga from Delft University of Technology has developed a guide on how to upgrade these machines so that they can simulate even more complex quantum systems. The study is now published in Physical Review Letters.

"Creating useful quantum computers and quantum simulators is one of the most important and debated topics in quantum science today, with the potential to revolutionise society," says researcher Natalia Chepiga. Quantum simulators are a type of quantum computer, Chepiga explains: "Quantum simulators are meant to address open problems of quantum physics to further push our understanding of nature. Quantum computers will have wide applications in various areas of social life, for example in finances, encryption and data storage."

Steering wheel

"A key ingredient of a useful quantum simulator is a possibility to control or manipulate it," says Chepiga. "Imagine a car without a steering wheel. It can only go forward but cannot turn. Is it useful? Only if you need to go in one particular direction, otherwise the answer will be 'no!'. If we want to create a quantum computer that will be able to discover new physics phenomena in the near-future, we need to build a 'steering wheel' to tune into what seems interesting. In my paper I propose a protocol that creates a fully controllable quantum simulator."

Recipe

The protocol is a recipe -- a set of ingredients that a quantum simulator should have to be tunable. In the conventional setup of a quantum simulator, rubidium (Rb) or cesium (Cs) atoms are targeted by a single laser. As a result, these particles will take up electrons, and thereby become more energetic; they become excited. "I show that if we were to use two lasers with different frequencies or colours, thereby exciting these atoms to different states, we could tune the quantum simulators to many different settings," Chepiga explains.

The protocol offers an additional dimension of what can be simulated. "Imagine that you have only seen a cube as a sketch on a flat piece of paper, but now you get a real 3D cube that you can touch, rotate and explore in different ways," Chepiga continues. "Theoretically we can add even more dimensions by bringing in more lasers."

Simulating many particles

"The collective behaviour of a quantum system with many particles is extremely challenging to simulate," Chepiga explains. "Beyond a few dozens of particles, modelling with our usual computer or a supercomputer has to rely on approximations." When taking the interaction of more particles, temperature and motion into account, there are simply too many calculations to perform for the computer.

Quantum simulators are composed of quantum particles, which means that the components are entangled. "Entanglement is some sort of mutual information that quantum particles share between themselves. It is an intrinsic property of the simulator and therefore allows to overcome this computational bottleneck."


Story Source:

Materials provided by Delft University of Technology. Note: Content may be edited for style and length.


Journal Reference:

  1. Natalia Chepiga. Tunable Quantum Criticality in Multicomponent Rydberg Arrays. Physical Review Letters, 2024; 132 (7) DOI: 10.1103/PhysRevLett.132.076505

Cite This Page:

Delft University of Technology. "A new design for quantum computers." ScienceDaily. ScienceDaily, 15 February 2024. <www.sciencedaily.com/releases/2024/02/240215142311.htm>.
Delft University of Technology. (2024, February 15). A new design for quantum computers. ScienceDaily. Retrieved April 24, 2024 from www.sciencedaily.com/releases/2024/02/240215142311.htm
Delft University of Technology. "A new design for quantum computers." ScienceDaily. www.sciencedaily.com/releases/2024/02/240215142311.htm (accessed April 24, 2024).

Explore More

from ScienceDaily

RELATED STORIES