Quantum non-demolition state detection and spectroscopy of single trapped molecules

Abstract

Trapped atoms and ions are among the best controlled quantum systems which find widespread applications in quantum information, sensing and metrology. For molecules, however, a similar degree of control is currently lacking owing to their complex energy-level structure. Quantum-logic protocols in which atomic ions serve as probes for molecular ions are a promising route for achieving this level of control, especially with homonuclear molecules that decouple from black-body radiation. Here, a quantum-non-demolition protocol on single trapped N${}_2^{+}$ molecules is demonstrated. The spin-rovibronic state of the molecule is detected with more than 99% fidelity and the position and strength of a spectroscopic transition in the molecule are determined, both without destroying the molecular quantum state. The present method lays the foundations for new approaches to molecular precision spectroscopy, for state-to-state chemistry on the single-molecule level and for the implementation of molecular qubits.

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• Quantum non-demolition state detection and spectroscopy of single trapped molecules
• Precision frequency-comb terahertz spectroscopy on pure quantum states of a single molecular ion
• Measuring the stability of fundamental constants with a network of clocks
• Quantum control of molecules for fundamental physics
• Cold trapped molecular ions and hybrid platforms for ions and neutral particles
• Observation of Chemical Reactions between a Trapped Ion and Ultracold Feshbach Dimers
• SI-traceable frequency dissemination at 1572.06 nm in a stabilized fiber network with ring topology
• Coupling light to a nuclear spin gas with a two-photon linewidth of five millihertz
• Enantiomer superpositions from matter-wave interference of chiral molecules
• Identification of molecular quantum states using phase-sensitive forces
• Quantum-Logic Detection of Chemical Reactions
• Resonance-enhanced multiphoton ionization in the x-ray regime
• Controlling the nature of a charged impurity in a bath of Feshbach dimers
• From megahertz to terahertz qubits encoded in molecular ions: theoretical analysis of dipole-forbidden spectroscopic transitions in N${}_2^{+}$
• Rotational spectroscopy of a single molecular ion at sub part-per-trillion resolution
• Trapping and Ground-State Cooling of a Single H${}_2^{+}$
• Ultracold ion-atom experiments: cooling, chemistry, and quantum effects
• Quantum state tracking and control of a single molecular ion in a thermal environment
• Prospects of nuclear-coupled-dark-matter detection via correlation spectroscopy of I${}_2^{+}$ and Ca${}^{+}$
• Strategies for implementing quantum error correction in molecular rotation
• Prospect for precision quantum logic spectroscopy of vibrational overtone transitions in molecular oxygen ions
• Quantum control of a single ${\mathrm{H}}_2^{+}$ molecular ion
• Coherent Control of Mid-Infrared Frequency Comb by Optical Injection of Near-Infrared Light
• Photodissociation spectra of single trapped CaOH+ molecular ions
• Ultracold Interactions between Ions and Polar Molecules
• Unresolved sideband photon recoil spectroscopy of molecular ions
• Wavelength modulation laser spectroscopy of N${}_2$O at 17 $\mu$m
• Adiabatically controlled motional states of a ground-state cooled CaO${}^{+}$ and Ca${}^{+}$ trapped ion chain
• Probing rotational decoherence with a trapped-ion planar rotor
• Quantum logic control of a transition metal ion
• Precise Determination of Excited State Rotational Constants and Black-Body Thermometry in Coulomb Crystals of Ca${}^{+}$ and CaH${}^{+}$
• High-fidelity quantum state control of a polar molecular ion in a cryogenic environment
• Rotational state changes in collisions of diatomic molecular ions with atomic ions
• A versatile apparatus for simultaneous trapping of multiple species of ultracold atoms and ions to enable studies of low energy collisions and cold chemistry
• Charge Exchange Dynamics in Cold Collisions of ${}^{40}$CaH${}^{+}$ and ${}^{39}$K
• Rotational excitation in sympathetic cooling of diatomic molecular ions by laser-cooled atomic ions
• Molecular Quantum Control Algorithm Design by Reinforcement Learning
• Electric field dissociation of weakly bound molecular ions
• State-Selective Ionization and Trapping of Single H${}_2^{+}$ Ions with (2+1) Multiphoton Ionization