Probing Scalar Coupling Differences via Long-Lived Singlet States

Abstract

We probe small scalar coupling differences via the coherent interactions between two nuclear spin singlet states in organic molecules. We show that the spin-lock induced crossing (SLIC) technique enables the coherent transfer of singlet order between one spin pair and another. The transfer is mediated by the difference in cis and trans vicinal J couplings among the spins. By measuring the transfer rate, we calculate a J coupling difference of $8\pm 2$ mHz in phenylalanine-glycine-glycine and $2.57\pm 0.04$ Hz in glutamate. We also characterize a coherence between two singlet states in glutamate, which may enable the creation of a long-lived quantum memory.

References in corpus (5)

• Preparation of Nuclear Spin Singlet States using Spin-Lock Induced Crossing
• Spin lock composite and shaped pulses for efficient and robust pumping of dark states in magnetic resonance
• Measuring Long-Lived ^{13}C-Singlet State Lifetimes at Natural Abundance
• Dependence of nuclear spin singlet lifetimes on RF spin-locking power
• Two-qubit gates for decoherence-free qubits using a ring exchange interaction

Cited by in corpus (1)

• Symmetry-Based Singlet-Triplet Excitation in Solution Nuclear Magnetic Resonance