Assembly and coherent control of a register of nuclear spin qubits

Abstract

The generation of a register of highly coherent, but independent, qubits is a prerequisite to performing universal quantum computation. Here we introduce a qubit encoded in two nuclear spin states of a single 87Sr atom and demonstrate coherence approaching the minute-scale within an assembled register of individually-controlled qubits. While other systems have shown impressive coherence times through some combination of shielding, careful trapping, global operations, and dynamical decoupling, we achieve comparable coherence times while individually driving multiple qubits in parallel. We highlight that even with simultaneous manipulation of multiple qubits within the register, we observe coherence in excess of 105 times the current length of the operations, with $${T}_{2}^{{{{{\mathrm{echo}}}}}}=\left(40\pm 7\right)$$ T 2 echo = 40 ± 7 seconds. We anticipate that nuclear spin qubits will combine readily with the technical advances that have led to larger arrays of individually trapped neutral atoms and high-fidelity entangling operations, thus accelerating the realization of intermediate-scale quantum information processors.

Erasure conversion for fault-tolerant quantum computing in alkaline earth Rydberg atom arrays

“…While this work provides a novel motivation to pursue qubits based on Yb and other alkaline earth-like atoms, these atoms have also attracted recent interest thanks to other potential advantages 28,29,40,52,[66][67][68][69] . In particular, long qubit coherence times 28,29,69 , narrow-line laser cooling, and rapid single-photon Rydberg excitation from the metastable 3 P 0 level offer the potential for improved entangling gate fidelities and a suppression of technical noise. We note that the highest reported Rydberg entanglement fidelity was achieved using the analogous metastable state in 88 Sr 52 .…”

Multivalent optical cycling centers in polyatomic molecules

“…Leveraging these features in multi-electron atoms has been a principal factor enabling record-setting optical lattice [66][67][68][69] and tweezer clocks [70,71], analog manybody simulators of SU(N ) and multiorbital Hamiltonians [72][73][74][75][76][77], advanced atom interferometers [78], high-fidelity entangling gates [64,79,80], and telecom-compatible quantum transducers and memories [81][82][83][84][85].…”

High-resolution spectroscopy and single-photon Rydberg excitation of reconfigurable ytterbium atom tweezer arrays utilizing a metastable state

“…The advantage of the use of the nuclear spin degree of freedom of 171 Yb, in particular, in quantum information processing was discussed in [14][15][16]. Coherent nuclear spin control between two out of ten spin components in 87 Sr [17] and between the two spin components in 171 Yb [18,19] in optical tweezers were experimentally demonstrated recently.…”