A5018847809- Photonic and Optical Devices
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Advanced Fiber Laser Technologies
- Neural Networks and Reservoir Computing
- Quantum Mechanics and Applications
- Mass Spectrometry Techniques and Applications
- Atomic and Molecular Physics
- Mechanical and Optical Resonators
- Laser-Matter Interactions and Applications
- Photonic Crystals and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Photorefractive and Nonlinear Optics
- Diamond and Carbon-based Materials Research
- Optical Network Technologies
- Advanced Chemical Physics Studies
- Photocathodes and Microchannel Plates
- Advanced Electron Microscopy Techniques and Applications
- Optical Coherence Tomography Applications
- Ion-surface interactions and analysis
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Optical Sensing Technologies
- Advanced Fluorescence Microscopy Techniques
- Quantum Computing Algorithms and Architecture
- Orbital Angular Momentum in Optics
Massachusetts Institute of Technology
2021-2025
Cambridge Electronics (United States)
2022
Vassar College
2022
University of Oxford
2017-2020
Lawrence Berkeley National Laboratory
2017
Goethe University Frankfurt
2013-2017
Recent advances in photonic integrated circuits (PICs) have enabled a new generation of "programmable many-mode interferometers" (PMMIs) realized by cascaded Mach Zehnder Interferometers (MZIs) capable universal linear-optical transformations on N input-output optical modes. PMMIs serve critical functions quantum information processing, quantum-enhanced sensor networks, machine learning and other applications. However, PMMI implementations reported to date rely thermo-optic phase shifters,...
Quantum interference of two independent particles in pure quantum states is fully described by the particles' distinguishability: closer are to being identical, higher degree interference. When more than involved, situation becomes complex and capability extends beyond pairwise distinguishability, taking on a surprisingly rich character. Here, we study many-particle using three photons. We show that distinguishability between pairs photons not sufficient describe photons' behaviour...
We demonstrate how boson sampling with photons of partial distinguishability can be expressed in terms interference fewer photons. use this observation to propose a classical algorithm simulate the output sampler fed distinguishability. find conditions for which is efficient, gives lower limit on required indistinguishability quantum advantage. Under these conditions, adding more only polynomially increases computational cost experiment.
Topological photonics sheds light on some of the surprising phenomena seen in condensed matter physics that arise with appearance topological invariants. Optical waveguides provide a well-controlled platform to investigate effects relate different phases matter, providing insight into such as insulators and superconductors by direct simulation states are protected topology system. Here, we observe mode associated defect bulk 2D photonic material introducing vortex distortion an hexagonal...
A central goal in creating long-distance quantum networks and distributed computing is the development of interconnected individually controlled qubit nodes. Atom-like emitters diamond have emerged as a leading system for optically networked memories, motivating visible-spectrum, multi-channel photonic integrated circuit (PIC) systems scalable atom control. However, it has remained an open challenge to realize optical programmability with layer that can achieve high detection probability...
Advances in laser technology have driven discoveries atomic, molecular, and optical (AMO) physics emerging applications, from quantum computers with cold atoms or ions, to networks solid-state color centers. This progress is motivating the development of a new generation control systems that can manipulate light field high fidelity at wavelengths relevant for AMO applications. These are characterized by criteria: (C1) operation design wavelength choice visible (VIS) near-infrared (IR)...
Solutions for scalable, high-performance optical control are important the development of scaled atom-based quantum technologies. Modulation many individual beams is central to applying arbitrary gate and sequences on arrays atoms or atom-like systems. At telecom wavelengths, miniaturization components via photonic integration has pushed scale performance classical optics far beyond limitations bulk devices. However, material platforms high-speed integrated photonics lack transparency at...
We demonstrate the use of cold target recoil ion momentum spectroscopy to perform state-selective measurements dissociative channels following single-photon double-ionization ${\mathrm{H}}_{2}\mathrm{O}$. The two dominant dissociation observed lead two-body (${\mathrm{OH}}^{+}+{\mathrm{H}}^{+}+2{e}^{\ensuremath{-}}$) and three-body ($2{\mathrm{H}}^{+}+\mathrm{O}+2{e}^{\ensuremath{-}}$) ionic fragmentation channels. In case we observe presence an autoionization process with a...
One of the central principles quantum mechanics is that if there are multiple paths lead to same event and no way distinguish between them, interference occurs. It often assumed distinguishing information in preparation, evolution, or measurement a system sufficient destroy interference. However, it still possible for photons distinguishable, separable states interfere due indistinguishability corresponding exchange processes. Here we experimentally measure an signal depends only on...
We report on the observation of discrete structures in electron energy distribution for strong field double ionization argon at 394 nm. The experimental conditions were chosen order to ensure a nonsequential ejection both electrons with an intermediate rescattering step. have found above-threshold like peaks sum electrons, as predicted by all quantum mechanical calculations. More surprisingly, however, is two combs individual electrons.
We simultaneously measured the momentum transferred to a free-floating molecular double slit and change of atom scattering from it. Our experimental results are compared quantum mechanical semiclassical models. The reveal that classical description slits, which was used by Einstein in his debate with Bohr, provides surprisingly good results, even for microscopic system, if transfer is not ascribed specific pathway but shared coherently between both.
We study the impact of distinguishability and mixedness, two fundamental properties quantum states, on interference. show that these can influence interference multiple particles in different ways, leading to effects cannot be observed alone. This is demonstrated experimentally by interfering three independent photons pure mixed states observing their multiphoton interference, despite exhibiting same two-photon Hong-Ou-Mandel In addition its relevance, our observation has important...
Solutions for scalable, high-performance optical control are important the development of scaled atom-based quantum technologies. Modulation many individual beams is central to application arbitrary gate and sequences on arrays atoms or atom-like systems. At telecom wavelengths, miniaturization components via photonic integration has pushed scale performance classical optics far beyond limitations bulk devices. However, these material platforms high-speed integrated photonics not transparent...
A dramatic symmetry breaking in $K$-shell photoionization of the ${\mathrm{CF}}_{4}$ molecule which a core-hole vacancy is created one four equivalent fluorine atoms displayed molecular frame angular distribution photoelectrons. Observing photoejected electron coincidence with an ${\mathrm{F}}^{+}$ atomic ion after Auger decay shown to select dissociation path where core hole was localized almost exclusively on that atom. combination measurements and ab initio calculations photoelectron...
Molecular frame photoelectron angular distributions (MFPADs) are measured in electron-ion momentum imaging experiments and compared with complex Kohn variational calculations for carbon K-shell ionization of tetrafluoride (CF 4 ), ethane (C 2 H 6 ) 1,1-difluoroethylene F ).While the polarization averaged MFPADs show a tendency at low energies to be emitted directions bonds, opposite effect is seen CF4.A combination these behaviors difluoroethylene where from two carbons can distinguished...
Advances in laser technology have driven discoveries atomic, molecular, and optical (AMO) physics emerging applications, from quantum computers with cold atoms or ions, to networks solid-state color centers. This progress is motivating the development of a new generation "programmable control" systems, characterized by criteria (C1) visible (VIS) near-infrared (IR) wavelength operation, (C2) large channel counts extensible beyond 1000s individually addressable atoms, (C3) high intensity...
Photonic integrated circuits (PICs) are important enabling technologies for the developments of areas such as quantum information processing (QIP). Coupled-mode beam splitters (IBS) widely used in many PICs, so direct and accurate testing individual IBSs inside a PIC is increasingly desirable, development PICs QIP scaled up. Here we demonstrate solution component-wise coupled-mode without limitations on component location architectures. The method based imaging an IBS with custom-built...
A central goal in creating long-distance quantum networks and distributed computing is the development of interconnected individually controlled qubit nodes. Atom-like emitters diamond have emerged as a leading system for optically networked memories, motivating visible-spectrum, multi-channel photonic integrated circuit (PIC) systems scalable atom control. However, it has remained an open challenge to realize optical programmability with layer that can achieve high detection probability...
Attempts to create quantum degenerate gases without evaporative cooling have been pursued since the early days of laser cooling, with consensus that polarization gradient (PGC, also known as "optical molasses") alone cannot reach condensation. In present work, we report simple PGC can generate a small Bose-Einstein condensate (BEC) inside corrugated micrometer-sized optical dipole trap. The experimental parameters enabling BEC creation were found by machine learning, which increased atom...
Attempts to create quantum degenerate gases without evaporative cooling have been pursued since the early days of laser cooling, with consensus that polarization gradient (PGC, also known as ``optical molasses'') alone cannot reach condensation. In present work, we report simple PGC can generate a small Bose-Einstein condensate (BEC) inside corrugated micrometer-sized optical dipole trap. The experimental parameters enabling BEC creation were found by machine learning, which increased atom...
Photonic integrated circuits (PICs) directly written with a femtosecond laser have shown great potential in many areas such as quantum information processing (QIP). Many applications, like photon-based computing, demand the up-scaling of PICs and ever-higher optical performance, controllable polarisation dependence lower loss. In order to overcome current limitations fabrication precision, repeatability material uniformity, solution for non-destructive testing large-scale component-wise...
We study the impact of distinguishability and mixedness -- two fundamental properties quantum states on interference. show that these can influence interference multiple particles in different ways, leading to effects cannot be observed alone. This is demonstrated experimentally by interfering three independent photons pure mixed observing their multiphoton interference, despite exhibiting same two-photon Hong-Ou-Mandel (HOM) Besides its relevance, our observation has important implications...