But the information encoded in qubits is delicate and, in the noisy real world, prone to errors that are difficult to capture and correct. Quantum computers-machines in which information is encoded in quantum bits (qubits) that can exist in multiple states simultaneously-have long been touted for their potential to solve problems too difficult for classical computers. The feat marks a step on the road toward fully fault-tolerant quantum machines. research team has demonstrated fault-tolerant control of a “logical qubit” consisting of an array physical qubits: 15 laser-controlled ions suspended in an ion-trap chip. Some reports have called this emergent dynamical symmetry-protected topological phase a ‘second dimension’ of time.A U.S. “Because of that, the edge stays quantum-mechanically coherent much, much longer than you’d expect.” “With this quasi-periodic sequence, there’s a complicated evolution that cancels out all the errors that live on the edge,” he said. With the quasi-periodic pattern, the qubits stayed quantum for the entire length of the experiment, about 5.5 seconds. In the periodic test, the edge qubits stayed coherent for around 1.5 seconds. The focus was on the qubits at either end of the 10-atom array. Using Quantinuum’s quantum computer, the researchers pulsed the laser light at the computer’s qubits both periodically and using the sequence based on the Fibonacci numbers. This arrangement is ordered without repeating. The quasi-periodic laser-pulse is based on the Fibonacci sequence, where each part of the sequence is the sum of the two previous parts (A, AB, ABA, ABAAB, ABAABABA, etc.). “In practice, experimental devices have many sources of error that can degrade coherence after just a few laser pulses.” “Even if you keep all the atoms under tight control, they can lose their ‘quantumness’ by talking to their environment, heating up or interacting with things in ways you didn’t plan,” said Philipp Dumitrescu, who worked on the project as a research fellow at the Flatiron Institute’s Centre for Computational Quantum Physics in New York City, along with researchers in Texas, Vancouver and Massachusetts. This addresses the issue of error correction. Israel to build open architecture quantum computer.
This phase shows edge qubits that are dynamically protected from control errors, cross-talk and stray fields. Rather than a second dimension in time, the work demonstrates an emergent dynamical symmetry-protected topological phase in an array of ten Ytterbium trapped ion qubits in Quantinuum’s System Model H1 quantum processor. By shining a quasiperiodic laser pulse sequence inspired by the Fibonacci numbers at atoms inside a quantum computer, the researchers in the US and Canada have dramatically improved the stability of trapped ion qubits, which will boost the performance of error- corrected quantum computers.
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