Diamond processors bring quantum computing closer to real-world use

Quantum Transistors has reported a gate fidelity of 99.9988% using diamond-based quantum processors. The company described the result as a world record for quantum gate performance.

The achievement was announced in a company press release dated December 10, 2025. The result positions diamond-based processors as a lower-cost and more accessible option for scalable quantum computing.

Quantum gate fidelity measures how accurately quantum operations are performed. High fidelity is required to reduce error rates and limit the overhead needed for error correction in large quantum systems.

According to the company, environmental noise remains a major obstacle to scaling quantum computers. Many existing qubit platforms rely on extremely low temperatures to suppress noise, requiring expensive dilution refrigeration systems.

Quantum Transistors said its diamond-based platform can operate across a wide temperature range, from room temperature to cryogenic conditions. This reduces dependence on sub-Kelvin cooling while maintaining high performance.

The company attributed the fidelity result to a control method called PUDDINGs, short for Power-Unaffected, Double-Detuning-Insensitive Gates. The technique is designed to suppress multiple sources of noise at the same time.

PUDDINGs modifies the control pulses used to operate qubits. The method adds layers of protection that cancel different types of interference during gate operations.

Quantum Transistors said the approach draws on principles used in magnetic resonance imaging. The technique reduces errors quadratically rather than linearly, enabling larger performance gains with each improvement.

The company described the work as the first experimental demonstration of error-protected two-qubit gates in a solid-state quantum system. Two-qubit gates are a critical requirement for practical quantum computation.

Shmuel Bachinsky, chief executive officer and co-founder of Quantum Transistors, said the result represents a significant step toward scalable systems. He said improved fidelity makes it easier to build systems capable of addressing real-world problems.

Bachinsky also said the wide operating temperature range allows systems to be tailored for specific applications. He said the work places diamond-based qubits on a credible path toward scalable and fault-tolerant quantum computers.

Quantum Transistors said the findings support the potential of diamond-based architectures for next-generation quantum computing. The company has published a full research paper detailing the results.