QV Progression at Quantinuum Showing Quantum Volume (QV) and Heavy Output Outcome Percents (h). Credit: Quantinuum

Quantinuum has announced another increase in their Quantum Volume (QV) metric for their Ion Trap machines. The previous measure was 4096 which they announced last April and now they have increased it to 8192. This means that it has successfully completed the Quantum Volume test specified by IBM with a circuit of 13 qubits that is 13 levels deep. A key ingredient to make this happen was the implementation of an additional type of two-qubit gate which they call the “Arbitrary Angle Two-Qubit Gate”. This provides a more flexible way of implementing a two-qubit gate versus the fixed rotations that are used in the original Mølmer–Sørensen gate used in ion trap quantum processors. The benefit is that the Arbitrary Angle gate can implement certain quantum operations more efficiently with fewer levels, faster times, and higher fidelities. For example, Quantinuum indicates that the Quantum Fourier Transfer algorithm can be implement with one-half the number of two-qubit gates using this Arbitrary Angle gate.

In a related announcement, Quantinuum also announced that there have been 500,000 downloads of their open source TKET software since it was released. This number has been helped tremendously by Quantinuum’s decision in 2021 to make this software open source. Although we don’t believe that all the people who downloaded the software are actively using it, it is still an impressive number. TKET has already incorporated support for the Arbitrary Angle Two-Qubit gate.

Additional information about Quantinuum’s announcement is available in a press release that can be seen here and also a technical paper posted on arXiv that demonstrates a use of the Arbitrary Angle two-qubit gate as well as the qubit resets and other advanced features here.

September 27, 2022