Atomic, Molecular, Optical Science

AMOS encompasses the research in
atomic, molecular, and optical science
at the Weizmann Institute of Science.

AMOS Research Areas

AMOS is a center for quantum physics with atomic, molecular, and optical systems, at the Weizmann Institute of Science. The center includes 15 research groups and activities ranging across most contemporary topics in AMO physics - from atto-second pulses and intense lasers, through precision spectroscopy of ultracold atoms, molecules or ions, to quantum information and quantum optics. AMOS members hold faculty appointments in both the Physics and Chemistry Faculties at the Weizmann Institute of Science.

A wide range of interests and scientific excellence contribute to making AMOS one of Israel's leading research centers. AMOS scientists publish annually numerous scientific manuscripts in leading journals.

Seminars

  • Date:
    20
    Feb 2024
    13:15

    Journal Club

    Speakers
    Orr Barnea & Uri Goldblatt
    • Non-destructive inelastic recoil spectroscopy of a single molecular ion (Orr Barnea)

    A novel single molecule technique is demonstrated that is compatible with high precision measurements and obtained the spectrum of two molecular ion species. While the current result yields modest spectral resolution due to a broad light source, The method is expected to ultimately provide resolution comparable to quantum logic methods with significantly less stringent requirements. Adaptations of this technique will prove useful in a wide range of precision spectroscopy arenas including the search for parity violating effects in chiral molecules. I will present a qualitative comparison between this method and quantum logic spectroscopy and the tradeoff between them.

    • Enhancing the lifetime of a superconducting cavity qubit through environment monitoring and feedback (Uri Goldblatt)

    Bosonic qubits encoded in superconducting cavities are a promising approach for realizing quantum memories and bosonic codes with built-in protection against decoherence. However, a noisy ancilla qubit is required to encode and manipulate the bosonic qubit. As a result, ancilla errors propagate to the cavity, dephasing the cavity-encoded qubit. This error propagation presented a major limitation in previous experiments with bosonic qubits. I'll present a thorough review of this phenomenon as well as a novel error mitigation protocol based on repeated measurements and real-time feedback to suppress this error propagation. I'll demonstrate the effect of this procedure on the coherence time of the bosonic qubit.

     

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  • Date:
    12
    Mar 2024
    13:15

    High-dimensional quantum information processing using spatially entangled photons

    Speakers
    Ohad Lib

    High-dimensional entanglement promises to boost the information capacity and resilience to noise of photonic quantum technologies. In this talk, I will focus on the spatial degree of freedom of photons and how it can be utilized for quantum information processing. I will describe our work on the scattering of quantum light in disordered media [1], including scattering compensation [2], Hanbury Brown Twiss (HBT) interference [3], and coherent backscattering [4] of entangled photons. I will then show our recent results on manipulating high-dimensional entanglement using multi-plane light conversion [5] for entanglement certification in large cluster states.

    [1] Ohad Lib, and Yaron Bromberg. "Quantum light in complex media and its applications." Nature Physics 18.9 (2022)

    [2] Ohad Lib Giora Hasson, and Yaron Bromberg. "Real-time shaping of entangled photons by classical control and feedback." Science Advances 6.37 (2020)

    [3] Ohad Lib, and Yaron Bromberg. "Thermal biphotons." APL Photonics 7.3 (2022)

    [4] Mamoon Safadi, Ohad Lib, et al. "Coherent backscattering of entangled photon pairs." Nature Physics 19.4 (2023)‏

    [5] Ohad Lib, Kfir Sulimany, and Yaron Bromberg. "Processing entangled photons in high dimensions with a programmable light converter." Physical Review Applied 18.1 (2022)

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News

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Publications

  • Use of spatiotemporal couplings and an axiparabola to control the velocity of peak intensity

    Liberman A., Lahaye R., Smartsev S., Tata S., Benracassa S., Golovanov A., Levine E., Thaury C. & Malka V. (2024) Optics Letters.
    This paper presents the first experimental realization of a scheme that allows for the tuning of the velocity of peak intensity of a focal spot with relativistic intensity. By combining a tunable pulse-front curvature with the axial intensity deposition characteristics of an axiparabola, an aspheric optical element, this system provides control over the dynamics of laser-wakefield accelerators. We demonstrate the ability to modify the velocity of peak intensity of ultrashort laser pulses to be superluminal or subluminal. The experimental results are supported by theoretical calculations and simulations, strengthening the case for the axiparabola as a pertinent strategy to achieve more efficient acceleration.
  • Real-time visualization of the laser-plasma wakefield dynamics

    Wan Y., Tata S., Seemann O., Levine E. Y., Kroupp E. & Malka V. (2024) Science advances.
    The exploration of new acceleration mechanisms for compactly delivering high-energy particle beams has gained great attention in recent years. One alternative that has attracted particular interest is the plasma-based wakefield accelerator, which is capable of sustaining accelerating fields that are more than three orders of magnitude larger than those of conventional radio-frequency accelerators. In this device, acceleration is generated by plasma waves that propagate at nearly light speed, driven by intense lasers or charged particle beams. Here, we report on the direct visualization of the entire plasma wake dynamics by probing it with a femtosecond relativistic electron bunch. This includes the excitation of the laser wakefield, the increase of its amplitude, the electron injection, and the transition to the beam-driven plasma wakefield. These experimental observations provide first-hand valuable insights into the complex physics of laser beam-plasma interaction and demonstrate a powerful tool that can largely advance the development of plasma accelerators for real-time operation.