Researchers at MIT have made a significant breakthrough in quantum computing by achieving a world-record single-qubit fidelity of 99.998 percent using a superconducting qubit called fluxonium. This achievement, made possible by two new control techniques, paves the way for more complex and reliable quantum computations.
Researchers at MIT have achieved a world-record single-qubit fidelity of 99.998 percent using a superconducting qubit called fluxonium. This breakthrough, made possible by two new control techniques, marks a significant step towards practical quantum computing. Qubits, the fundamental building blocks of quantum computers, are highly susceptible to noise and control imperfections.
These imperfections introduce errors into quantum operations, ultimately limiting the complexity and duration of a quantum algorithm. To address this challenge, the MIT team focused on improving qubit performance by mitigating counter-rotating errors that arise during fast quantum operations. The researchers developed two techniques: 'commensurate pulses' and 'circularly polarized microwaves,' which effectively eliminate these errors. The approach involved applying pulses at specific times to make counter-rotating errors consistent and correctable. They also utilized a synthetic version of circularly polarized light to control the qubit's state, further enhancing fidelity. 'This project makes it clear that counter-rotating errors can be dealt with easily,' said David Rower, PhD '24, a recent physics postdoc at MIT. 'This is a wonderful thing for low-frequency qubits such as fluxonium, which are looking more and more promising for quantum computing.'Fluxonium qubits, known for their high coherence and noise resistance, have shown great promise for quantum computing. 'Despite having higher coherence, however, fluxonium has a lower qubit frequency that is generally associated with proportionally longer gates,' highlighted the researchers in a press release. This latest research demonstrates their ability to support both fundamental physics explorations and high engineering performance. 'Here, we’ve demonstrated a gate that is among the fastest and highest-fidelity across all superconducting qubits,' says Leon Ding, PhD '23. 'Our experiments really show that fluxonium is a qubit that supports both interesting physical explorations and also absolutely delivers in terms of engineering performance.' This achievement builds on previous work by the MIT team, including the demonstration of a 99.92 percent two-qubit gate fidelity last year. The combination of advanced control methods and a deep understanding of the underlying physics has enabled them to push the boundaries of qubit performance. 'It builds on our earlier work with non-adiabatic qubit control, applies it to a new qubit — fluxonium — and makes a beautiful connection with counter-rotating dynamics,' remarked William D. Oliver, professor of physics at MIT.The researchers believe that their platform-independent strategies for mitigating counter-rotating effects will be instrumental in the effort to realize high-fidelity control for fault-tolerant quantum computing. 'With the recent announcement of Google’s Willow quantum chip that demonstrated quantum error correction beyond threshold for the first time, this is a timely result, as we have pushed performance even higher,' concluded Oliver. 'Higher-performant qubits will lead to lower overhead requirements for implementing error correction.'
QUANTUM COMPUTING MIT FLUXONIUM QUBIT FIDELITY ERROR MITIGATION
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