Method for preparation and readout of polyatomic molecules in single quantum states

Patterson, David

doi:10.1103/physreva.97.033403

Cited by 27 publications

(21 citation statements)

References 48 publications

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“…In a variety of molecules, this information will not be completely available. For the common situation in which only the frequencies of the transitions are known, e.g., from a prediction based on known spectroscopic constants, we propose and demonstrate here an adaption of the present method for partial state readout 35 that can be used to exclude a large subset of molecular states simultaneously and provide a non-destructive spectroscopic signal.…”

Section: Experimentmentioning

confidence: 99%

Identification of molecular quantum states using phase-sensitive forces

Najafian¹,

Meir²,

Sinhal³

et al. 2020

Nat Commun

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Quantum-logic techniques used to manipulate quantum systems are now increasingly being applied to molecules. Previous experiments on single trapped diatomic species have enabled state detection with excellent fidelities and highly precise spectroscopic measurements. However, for complex molecules with a dense energy-level structure improved methods are necessary. Here, we demonstrate an enhanced quantum protocol for molecular state detection using state-dependent forces. Our approach is based on interfering a reference and a signal force applied to a single atomic and molecular ion. By changing the relative phase of the forces, we identify states embedded in a dense molecular energy-level structure and monitor state-to-state inelastic scattering processes. This method can also be used to exclude a large number of states in a single measurement when the initial state preparation is imperfect and information on the molecular properties is incomplete. While the present experiments focus on N$${}_{2}^{+}$$ 2 + , the method is general and is expected to be of particular benefit for polyatomic systems.

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Section: Experimentmentioning

confidence: 99%

Identification of molecular quantum states using phase-sensitive forces

Najafian¹,

Meir²,

Sinhal³

et al. 2020

Nat Commun

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“…GKP codes were realized experimentally [5,6] nearly 20 years after the initial proposal [1], and full-fledged error correction for molecular qubits may still be many years away [32,Sec. V.D].…”

Section: A Molecular Rotorsmentioning

confidence: 99%

“…Laser cooling and quantum control of polyatomic molecules continues to be a rapidly-progressing field [8,32,47,48]. Further, the possibility of angular momentum state-resolved detection has recently been considered [10,32]. In addition, quantum gates of opticallytrapped symmetric top molecules have recently been analyzed [21].…”

Section: A Molecular Rotorsmentioning

confidence: 99%

“…Magnetic micro-traps [41] are compatible with electronic spin doublet or triplet molecules such as CaF, SrF, YbF, or YO. Radio-frequency electric traps are compatible with molecular ions [20,32]. Such trapping potentials are sub-stantially less dependent on the rotational state of the molecule since they couple to magnetic dipoles and electric monopoles, respectively.…”

Section: A Molecular Rotorsmentioning

confidence: 99%

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Encoding a qubit in a molecule

Albert

Covey

Preskill

2019

Rochester Conference on Coherence and Quantum Optics (CQO-11)

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We construct quantum error-correcting codes that embed a finite-dimensional code space in the infinite-dimensional Hilbert state space of rotational states of a rigid body. These codes, which protect against both drift in the body's orientation and small changes in its angular momentum, may be well suited for robust storage and coherent processing of quantum information using rotational states of a polyatomic molecule. Extensions of such codes to rigid bodies with a symmetry axis are compatible with rotational states of diatomic molecules, as well as nuclear states of molecules and atoms. We also describe codes associated with general nonabelian compact Lie groups and develop orthogonality relations for coset spaces, laying the groundwork for quantum information processing with exotic configuration spaces.

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“…In addition, the realisation of novel cooling techniques 10 and quantum logic detection schemes 11 has made high-resolution measurements with molecular ions practicable. High-resolution spectroscopy of molecular ions can be used to search for time variation of the proton-to-electron mass ratio 12 – 18 , the electron’s electric dipole moment 19 , 20 , parity violation in chiral polyatomic molecules 21 , 22 and nuclear-spin-dependent parity violation 23 .…”

Section: Introductionmentioning

confidence: 99%

The effect of the electric trapping field on state-selective loading of molecules into rf ion traps

Keller

2020

Sci Rep

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Trapped molecular ions in pure rovibronic states are desirable in experiments ranging from cold chemistry to searches for physics beyond the Standard Model. Resonance-enhanced multiphoton ionisation (REMPI) can be used to prepare molecular ions in specific internal states with high fidelities. However, in the presence of electric fields, ionisation spectra exhibit frequency shifts and the ionisation thresholds are broadened. For this reason, REMPI studies are normally conducted in low and highly homogeneous electric fields, whereas the operating principle of rf ion traps requires electric fields that vary in space and time. In order to investigate the impact of this on the state-selectivity of REMPI in ion traps, we have simulated the expected broadening of the ionisation threshold under various operating conditions of a typical linear Paul trap. In many cases, the width of the ionisation threshold exceeds the separation between rotational energy levels, preventing state-selective ionisation. Careful choice of the trapping and laser parameters during loading can reduce this broadening, enabling state-selective ionisation in some instances. Where this strategy is not sufficient, the broadening can be reduced further by rapidly switching the trapping voltages off and on again during loading. This has been demonstrated experimentally for a Coulomb crystal of $$^{40}\hbox {Ca}^+$$ 40 Ca + ions without descrystallising it.

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Method for preparation and readout of polyatomic molecules in single quantum states

Cited by 27 publications

References 48 publications

Identification of molecular quantum states using phase-sensitive forces

Identification of molecular quantum states using phase-sensitive forces

Encoding a qubit in a molecule

The effect of the electric trapping field on state-selective loading of molecules into rf ion traps

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