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Working with the Large Array Survey Telescope (LAST). Including searching for fast transients and gravitational wave optical counterparts.

Our group conducts theoretical study of various soft matter problems, typically ones that bring out geometry and topology as a crucial element in explaining observed physical phenomena (patterns, structures, mechanical properties, etc.). Our interests span many types of systems, materials and length scales, and includes liquid crystals, responsive smart materials, metamaterials, biological systems and more.

Our group conducts theoretical study of various soft matter problems, typically ones that bring out geometry and topology as a crucial element in explaining observed physical phenomena (patterns, structures, mechanical properties, etc.). Our interests span many types of systems, materials and length scales, and includes liquid crystals, responsive smart materials, metamaterials, biological systems and more.

We investigate phase locking of large arrays of coupled lasers in a modified degenerate cavity. We show that the minimal loss lasing solution is mapped to the ground state of an XY spin Hamiltonian with the same coupling matrix provided the intensity of all the lasers is uniform. We study the probability to obtain this ground state for various coupling schemes, system parameters and topological constrains. We demonstrate the effect of crowd synchrony with a sharp transition into an ordered state above a critical number of coupled lasers. Finally, we present recent results demonstrating the ability of our system to solve related problems such as phase retrieval, imaging through scattering medium and more.

In collaboration  with Roee Ozeri we form Bose Einstein condensates of rubidium 87 atoms, quantum degenerated fermionic gas of potassium 40 atoms, and their mixtures using laser cooling and evaporative cooling in magnetic and far-detuned optical traps and study their properties. Such dilute quantum gases offer full control of external and internal degrees of freedom and variety of unique interrogation tools that enable precise studies of many body quantum systems.

By using magnetic Feshbach resonances we tune the system from weakly interacting where the it can be simply described by a macroscopic wave function to the strongly interacting  where highly correlated many body states can be generated and studied. We study and characterize the coherence, dynamics and elementary excitations of these dilute quantum gases using laser and microwave probes and study new type of an opto-mechanical force when they are illuminated with far-detuned uniform laser beam.

In collaboration  with Ofer Firstenberg recently started a new joint project on efficient coupling of neutral-atom tweezer arrays to light. On the theoretical side we are collaborating with Efi Shahmoon. We plan to extend Efi’s original ideas for strong coupling in atomic arrays in sub-wavelength optical lattices (recently verified experimentally by Immanuel Bloch) to the emerging and promising field of quantum simulators with Rydberg atoms in tweezer arrays, where the spacing between the atoms is larger than the wavelength. The challenge to achieved strong coupling to light in such large-spacing arrays emerges from the existence of many diffraction orders that cannot be controlled.

Our proposed scheme to overcome this challenge is based on two supplementary efforts: first we will reduce the spacing between neighboring atoms in the array to <1.5 microns, by suppressing the mutual interferences that limit this distance to >3 microns in most state of the art demonstrations. Such spacing reduction will reduce the non-vanishing diffraction orders from the periodic array from many tens to only few. Next we will incorporate the tweezer array inside a medium finesse optical cavity that will enhance the zero diffraction order as compared to the others so as to ensure strong coupling to it.

We plan to achieve strong coupling to light, show efficient transfer of coherence and quantum states from the array onto a single radiation mode and then use it to demonstrate and study novel schemes for quantum simulators within the atomic tweezer array as well as quantum coupling between tweezer arrays for “scalable” quantum computer based on Rydberg induced gates.

We investigate phase locking of large arrays of coupled lasers in a modified degenerate cavity. We show that the minimal loss lasing solution is mapped to the ground state of an XY spin Hamiltonian with the same coupling matrix provided the intensity of all the lasers is uniform. We study the probability to obtain this ground state for various coupling schemes, system parameters and topological constrains. We demonstrate the effect of crowd synchrony with a sharp transition into an ordered state above a critical number of coupled lasers. Finally, we present recent results demonstrating the ability of our system to solve related problems such as phase retrieval, imaging through scattering medium and more.

In collaboration  with Roee Ozeri we form Bose Einstein condensates of rubidium 87 atoms, quantum degenerated fermionic gas of potassium 40 atoms, and their mixtures using laser cooling and evaporative cooling in magnetic and far-detuned optical traps and study their properties. Such dilute quantum gases offer full control of external and internal degrees of freedom and variety of unique interrogation tools that enable precise studies of many body quantum systems.

By using magnetic Feshbach resonances we tune the system from weakly interacting where the it can be simply described by a macroscopic wave function to the strongly interacting  where highly correlated many body states can be generated and studied. We study and characterize the coherence, dynamics and elementary excitations of these dilute quantum gases using laser and microwave probes and study new type of an opto-mechanical force when they are illuminated with far-detuned uniform laser beam.

In collaboration  with Ofer Firstenberg recently started a new joint project on efficient coupling of neutral-atom tweezer arrays to light. On the theoretical side we are collaborating with Efi Shahmoon. We plan to extend Efi’s original ideas for strong coupling in atomic arrays in sub-wavelength optical lattices (recently verified experimentally by Immanuel Bloch) to the emerging and promising field of quantum simulators with Rydberg atoms in tweezer arrays, where the spacing between the atoms is larger than the wavelength. The challenge to achieved strong coupling to light in such large-spacing arrays emerges from the existence of many diffraction orders that cannot be controlled.

Our proposed scheme to overcome this challenge is based on two supplementary efforts: first we will reduce the spacing between neighboring atoms in the array to <1.5 microns, by suppressing the mutual interferences that limit this distance to >3 microns in most state of the art demonstrations. Such spacing reduction will reduce the non-vanishing diffraction orders from the periodic array from many tens to only few. Next we will incorporate the tweezer array inside a medium finesse optical cavity that will enhance the zero diffraction order as compared to the others so as to ensure strong coupling to it.

We plan to achieve strong coupling to light, show efficient transfer of coherence and quantum states from the array onto a single radiation mode and then use it to demonstrate and study novel schemes for quantum simulators within the atomic tweezer array as well as quantum coupling between tweezer arrays for “scalable” quantum computer based on Rydberg induced gates.

Hawking radiation - the emission of quantum particles at the event horizon of a black hole - connects gravity with quantum mechanics and thermodynamics; the Bekenstein-Hawking entropy has been the benchmark for potential quantum theories of gravity. But Hawking radiation has never been observed in astronomy, only in laboratory analogues including our experiment, and the chances of ever observing it in space are astronomically small. The energy of Hawking radiation must come from the gravitational field around the black hole, but how field quanta generate Hawking quanta has been unknown. We are working on getting experimental and theoretical evidence for the process that generates Hawking radiation in a fibre-optical analogue of the event horizon. There, as in gravity, it has been believed that Hawking radiation comes from a complicated, cascaded process; here we have found a simple, direct process and measured its backreaction on the field. Our findings suggest an equally direct process for other laboratory analogues and perhaps also for gravitational fields, shedding light on how black holes might radiate.

General relativity does allow time travel in theory, but Hawking conjectured that quantum mechanics prevents it in practice. In this project we plan to design an optical experiment that probes the quantum limitations on the time travel of light pulses in optical fibers. Intrigued? Come and ask for more details.

Hawking radiation - the emission of quantum particles at the event horizon of a black hole - connects gravity with quantum mechanics and thermodynamics; the Bekenstein-Hawking entropy has been the benchmark for potential quantum theories of gravity. But Hawking radiation has never been observed in astronomy, only in laboratory analogues including our experiment, and the chances of ever observing it in space are astronomically small. The energy of Hawking radiation must come from the gravitational field around the black hole, but how field quanta generate Hawking quanta has been unknown. We are working on getting experimental and theoretical evidence for the process that generates Hawking radiation in a fibre-optical analogue of the event horizon. There, as in gravity, it has been believed that Hawking radiation comes from a complicated, cascaded process; here we have found a simple, direct process and measured its backreaction on the field. Our findings suggest an equally direct process for other laboratory analogues and perhaps also for gravitational fields, shedding light on how black holes might radiate.

I am looking for a student interesting in observational work focussed on observations, in particular spectroscopic, of exploding stars (supernovae), very shortly (within hours or days) of the explosion. The project includes analysis of a large set of data already in hand (the largest and best of its kind in the world; in collaboration with an experienced postdoc) as well as work toward obtaining even better data with the new spectroscopic array being developed in our Neot Smadar Observatory and a new instrument coming on line in Chile.

I am looking for a student interested in working on a search for supernovae - exploding stars - which we can find using our new observatory in Neot Smadar. The unique aspect of this project is the capability of the new observatory to find such explosions almost "as they happen" as it monitors the sky very frequently - several times every night. This could lead to new discoveries as the capability is novel. The project includes significant hands-on work related to the new observatory, data analysis, as well as work with large follow-up telescopes abroad.  

I am looking for a student interested in working on large data sets that are now becoming available as part of the "data explosion" in astrophysics. Weizmann is a major world leader in this, both creating large data sets through our own observational work, as well as acting as a leading center curating large data sets from around the world on our systems. The focus of this project is on analysis of large observational data sets of exploding stars (supernovae) which require development of new methodologies, and is likely to shed light on fundamental questions in astrophysics. The work would interface with more traditional observational work using telescopes in Israel and abroad, as well as with some aspects of computing and mathematics.

Study of quantum and topological states of matter using novel scanning probe microscopy tools. We have recently developed a nano-SQUID (Superconducting Quantum Interference Device) that resides on a very sharp tip and allows imaging of local magnetic fields with single electron spin sensitivity and of current flow patterns. This device provides also a unique tool for cryogenic thermal imaging with 1 ֲµK sensitivity and scanning gate microscopy allowing imaging electron scattering and dissipation mechanisms on the nanoscale. The project will focus on utilizing these novel techniques for microscopic investigation of topological and quantum states of matter including investigation of local topology, superconductivity, magnetism, strongly correlated electronic states, and dissipation in graphene, moiré superlattices, and van der Waals heterostructures.

Study of quantum and topological states of matter using novel scanning probe microscopy tools. We have recently developed a nano-SQUID (Superconducting Quantum Interference Device) that resides on a very sharp tip and allows imaging of local magnetic fields with single electron spin sensitivity and of current flow patterns. This device provides also a unique tool for cryogenic thermal imaging with 1 ֲµK sensitivity and scanning gate microscopy allowing imaging electron scattering and dissipation mechanisms on the nanoscale. The project will focus on utilizing these novel techniques for microscopic investigation of topological and quantum states of matter including investigation of local topology, superconductivity, magnetism, strongly correlated electronic states, and dissipation in graphene, moiré superlattices, and van der Waals heterostructures.

The research in my group focuses on observational astrophysics, and our main tools are algorithms and statistics. We use these tools to improve observing capabilities in pulsar, FRB, exoplanet and gravitational wave astronomy.

Observational astrophysics is full with algorithmic and statistical questions that once solved, will dramatically improve our ability to observe the cosmos.

In my group, we combine tools of signal processing, statistical inference, dynamic programming, data structures, lattice algorithms, linear algebra algorithms, signal approximation, phase retrieval, optimization and Bayesian parameter estimation. Mastering these will be an indispensable tool for you wherever you go (academy / Hi-Tech)

It is very common that we invent new tools while trying to observe the cosmos. If you are looking for ways in which you can use your talent and creativity to observe the cosmos, this job post is for you.

The research in my group focuses on observational astrophysics, and our main tools are algorithms and statistics. We use these tools to improve observing capabilities in pulsar, FRB, exoplanet and gravitational wave astronomy.

Observational astrophysics is full with algorithmic and statistical questions that once solved, will dramatically improve our ability to observe the cosmos.

In my group, we combine tools of signal processing, statistical inference, dynamic programming, data structures, lattice algorithms, linear algebra algorithms, signal approximation, phase retrieval, optimization and Bayesian parameter estimation. Mastering these will be an indispensable tool for you wherever you go (academy / Hi-Tech)

It is very common that we invent new tools while trying to observe the cosmos. If you are looking for ways in which you can use your talent and creativity to observe the cosmos, this job post is for you.