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This study identifies a novel phenomenon where carbon-13 nuclear spins within diamond's nitrogen-vacancy centers display anisotropic relaxation that depends on the specific ordering of control pulses. Such findings are critical for optimizing coherence times and fidelity in quantum error correction protocols, directly advancing practical applications in solid-state qubit architectures. The results highlight intrinsic tensor behaviors that must be accounted for when designing scalable quantum processors based on diamond platforms.
Diamond Spins Show Relaxation Varies With Pulse Sequence Order

New research reveals that ¹³C spins in diamond, studied with nitrogen-vacancy centers, exhibit directional relaxation—a tensor—varying with pulse sequence order.
Researchers have demonstrated that the order of pulses in a quantum control sequence directly influences how spin relaxation occurs, challenging the long-standing view that relaxation can be fully described by only two independent rates. Sophia N. Fricke and colleagues from University of California used hyperpolarized carbon-13 (^13C) spins…
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