Quantum Circuits has unveiled its latest innovation in quantum computing: the Dual-Rail Qubit (DRQ), showcased in a recent publication in Nature Physics. This new qubit design integrates built-in error detection, a feature critical for advancing towards fault-tolerant quantum computing. The DRQ achieves exceptional performance metrics, including reducing phase errors frequency by 30X, bit-flip error frequency by 1000X, and achieving state preparation and measurement (SPAM) fidelities of up to 99.99%.

The DRQ’s architecture leverages two high-performance resonators to encode quantum information, minimizing environmental noise while enhancing qubit coherence and stability. By detecting and mitigating dominant errors effectively, such as phase and bit-flip errors occurring significantly slower than standard qubits, Quantum Circuits’ DRQ sets a new benchmark for reliability and performance in quantum computing.

This breakthrough not only enhances the feasibility of practical error correction but also accelerates the timeline towards scalable quantum processors capable of tackling complex computational tasks. Quantum Circuits’ commitment to advancing quantum technology through innovative qubit designs positions the DRQ as a pivotal step towards realizing the full potential of quantum computing.

In the meantime, Quantum Circuits is offering an alpha program to select customers that provides access through the cloud to the company’s Quantum Circuits Simulator that includes Error Detection Handling (EDH) and advanced Real-Time Control Flow (RTCF) functionality. Users can experiment to figure out how they can leverage these dual-rail qubits. From an algorithm standpoint, one of the new potential approaches this opens up is to leverage the built-in error detection to implement a new “Repeat Until it Succeeds” approach. That approach could significantly improve the accuracy of the circuit output and yet not be possible to do on other NISQ level machines.

For more information, please refer to Quantum Circuits’ official announcement here. A technical paper describing this superconducting dual-rail cavity qubit in more detail has been posted on the nature physics website here. And a blog article from Quantum Circuit describing the dual-rail qubit and their integrated software platform that can support can be accessed here.

July 3, 2024