New parallel gate entangles diamond qubits 10 times faster at room temperature
Quantum technologies rely on qubits, units of information that can exist in combinations of the states 0 and 1 instead of being limited to one or the other like conventional bits. Qubits can become entangled, which means their states become linked in ways that cannot be explained by considering each qubit separately.
Scientists at the University of Pennsylvania have developed a new technique for creating entangled qubits in diamond at room temperature, which can be up to 10 times faster than previous methods. Entangled qubits are crucial for quantum computing and other advanced technologies, but creating them has traditionally been a slow and error-prone process.
The researchers used a nitrogen-vacancy center in diamond as their quantum platform, which consists of a nitrogen atom next to a missing carbon atom. By manipulating the electron at this center and three nearby carbon-13 nuclei, they were able to create a four-qubit entangled state in just 14.8 microseconds using a single gate operation.
This is a significant speedup compared to the sequential two-qubit gate approach, which typically takes longer and suffers from crosstalk errors. The parallel gate also demonstrated high fidelity, meaning it performed as intended more accurately than the traditional sequential method. The researchers generated a four-qubit Greenberger–Horne–Zeilinger state, a type of entanglement where multiple qubits share a quantum state.
This achievement opens the door to more efficient quantum computing and other quantum technologies using diamond-based systems.
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