Using a superconducting quantum computer, physicists created a large and complex version of an odd quantum material that has a repeating structure in time
A time crystal more complex than any made before has been created in a quantum computer. Exploring the properties of this unusual quantum setup strengthens the case for quantum computers as machines well-suited for scientific discovery.
Typical crystals have atoms arranged in a specific repeating pattern in space, but time crystals are defined by a pattern that repeats in time instead. A time crystal repeatedly cycles through the same set of configurations and, barring deleterious influences from its environment, should This indefinite motion initially made time crystals seem like a threat to the fundamental laws of physics, but throughout the past decade researchers haveat Donostia International Physics Center in Spain and his colleagues have used an IBM superconducting quantum computer to make an unprecedentedly complex time crystal.While most past studies focused on one-dimensional time crystals, which can be compared to a neat line of atoms, the researchers set out to create a two-dimensional version. To that end, they used 144 superconducting qubits arranged in an interlocking pattern roughly like a honeycomb. Each qubit behaved similarly to a quantum mechanical spin and the team could control how nearby qubits interacted with each other.Being able to reach this new level of complexity allowed the team not only to create a time crystal more complex than any produced with a quantum computer before now, but also to start mapping out the features of the whole qubit system to obtain its “”. Completing a phase diagram is an important step for understanding the properties of a material – a phase diagram of water, for instance, reveals whether the water is liquid, solid or gas at a given temperature and pressure.at IBM, who wasn’t involved in the research, says this experiment may be the first in many steps that could eventually lead to quantum computers helping to design new materials based on a fuller picture of all the possible properties a quantum system can have, including those as odd as time crystals.Quantum theory fails to explain how the reality we experience emerges from the world of particles. A new take on quantum cause and effect could bridge the gap The model the researchers set out to emulate, which has a time crystal in its phase diagram, is already complicated enough that conventional computers can’t simulate it without approximations. At the same time, all existing quantum computers suffer from errors, so the researchers had to use those conventional methods to estimate where the quantum result may become unreliable. This back-and-forth between approximate conventional methods and exact but error-prone quantum approaches could sharpen our understanding of many complex quantum models for materials going forward, says Garcia. “Two-dimensional systems are practically very challenging to simulate numerically, so the large-scale quantum simulation with more than 100 qubits should provide an anchor point for future research,” saysat the University of Chinese Academy of Sciences. He says that the new study represents exciting experimental progress for several areas of study into quantum matter. Specifically, it could help connect time crystals, which can be simulated on quantum computers, to similar states that can be created in some types of
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