High fidelity entanglement of 43Ca+ hyperfine clock states

Abstract

In an experiment using the odd calcium isotope 43Ca+ we combine the merits of a high fidelity entangling operation on an optical transition (optical qubit) with the long coherence times of two 'clock' states in the hyperfine ground state (hyperfine qubit) by mapping between these two qubits. For state initialization, state detection, global qubit rotations and mapping operations, errors smaller than 1% are achieved whereas the entangling gate adds errors of 2.3%. Based on these operations, we create Bell states with a fidelity of 96.9(3)% in the optical qubit and a fidelity of 96.7(3)% when mapped to the hyperfine states. In the latter case, the entanglement is preserved for 96(3) ms, exceeding the duration of a single gate operation by three orders of magnitude.

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• Long-lived Bell states in an array of optical clock qubits
• Blackbody radiation shift, multipole polarizabilities, oscillator strengths, lifetimes, hyperfine constants, and excitation energies in Ca+
• Demonstration of a dressed-state phase gate for trapped ions
• Hyperfine and Optical Barium Ion Qubits
• Properties from relativistic coupled-cluster without truncation: hyperfine constants of ${}^{25}{\mathrm{Mg}}^{+}$, ${}^{43}{\mathrm{Ca}}^{+}$, ${}^{87}{\mathrm{Sr}}^{+}$ and ${}^{137}{\mathrm{Ba}}^{+}$
• Quantum Information Scrambling: From Holography to Quantum Simulators
• High-fidelity spatial and polarization addressing of Ca-43 qubits using near-field microwave control
• A Single Laser System for Ground-State Cooling of 25-Mg+
• Scalable hyperfine qubit state detection via electron shelving in the ${}^2$D${}_{5/2}$ and ${}^2$F${}_{7/2}$ manifolds in ${}^{171}$Yb${}^{+}$
• State selective detection of hyperfine qubits
• Two-Qubit Geometric Phase Gate for Quantum Dot Spins using Cavity Polariton Resonance
• Shuttling of Rydberg ions for fast entangling operations
• Efficient spin control in high-quality-factor planar micro-cavities