Doubly ionized lanthanum as a qubit candidate for quantum networks

High-fidelity remote entanglement of trapped atoms mediated by time-bin photons

“…The coherence of the desired remote entangled state of Eq.2 in the main body is insensitive to common mode qubit decoherence. In order to determine the effect of differential qubit decoherence on the observed state fidelity (presumably from differential magnetic field noise), we perform a Ramsey experiment on qubit A as observed from the frame of qubit B (43,44). After preparing both ions in the |↓⟩ state, we use the 1762 nm laser to apply a π/2 pulse to both qubits, wait for some delay time ∆t, and then apply another π/2 pulse with a scrambled phase.…”

Motional quantum metrology in a Penning trap

“…Generally, isotopes that can be produced by laser desorption can be also studied in a similar way. Some practicable example might be 139 La 2+ , proposed for telecom applications [34] or specific molecular ions for the study of chirality associated to enantiomers (chiral isomers) at the single-ion level [35] in the Penning trap.…”

“…Another interesting case which can be handled with the Penning-trap platform using a laser ablation ion source is the 139 La 2+ ion, the hyperfine structure of which has been studied [34] and a system for trapping and cooling is under completion [50]. The transitions of interest for this ion are the 2 D 3/2 → 2 F 5/2 and 2 D 5/2 → 2 F 7/2 with λ ∼ 1390 and ∼ 1410 nm, respectively, which can be accessed taking advantage of the available technology in the telecom regime.…”