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7234 discussions

[Aspuru-Guzik Group List] July 18, 2:00pm - HQI Special Seminar - Leigh Martin

by Ploucha, Clare

Harvard Quantum Initiative Special Seminar Thursday, July 18 2:00 PM Jefferson 356 Leigh Martin (UC Berkeley) Quantum feedback for measurement and control Many fundamental quantum limits arise from the inevitable disturbance caused by measurement. This disturbance imposes a barrier to precision measurement with no classical analog, but also provides a uniquely quantum mechanism for control. This talk explores both of these aspects in the context of quantum feedback. First, we discuss experimental results showing how feedback can take a measurement of phase to its fundamental limit. By continuously and adaptively changing measurement basis during readout of a single-photon signal, we enhance sensitivity over existing techniques and implement a canonical phase measurement. Second, we present theoretical methods for state control based on measurement back-action. We apply these methods to the task of entanglement generation and propose potential future experiments, including some that should be extremely robust to loss.

4 years, 11 months

[Aspuru-Guzik Group List] No Group Meeting July 18

by Riley Hickman

Hi all, There will no group meeting tomorrow. Best regards, Riley

4 years, 11 months

[Aspuru-Guzik Group List] Today, 2:00pm - HQI Special Seminar - Matthew Nichols

by Ploucha, Clare

Harvard Quantum Initiative Special Seminar Wednesday, July 17 2:00 PM Jefferson 250 Matthew Nichols (MIT) Probing the 2D Fermi-Hubbard Model Under a Quantum Gas Microscope Ultracold fermionic atoms in optical lattices offer a pristine platform for quantum simulation of materials with strong electron correlations. With the advent of quantum gas microscopy, we now have the abilities to observe and manipulate these systems at the level of single atoms and lattice sites. In this talk, I will describe how we perform microscopy on fermionic 40K, and how we realize the two-dimensional Fermi-Hubbard model, a paradigm believed to capture the essence of high-Tc superconductivity in the cuprates. I will then discuss some experiments we performed using this system, including a measurement of the spin conductivity of a homogeneous Mott insulator at half-filling, a quantity which is difficult to measure in the cuprates, and highly challenging to calculate theoretically. For strong interactions, we observed diffusive spin transport driven by super-exchange and doublon-hole assisted tunneling. Extending the technique developed for this measurement to finite doping could shed light on the complex interplay between spin and charge in the Hubbard model. -- Clare Ploucha Director of Programs Harvard Quantum Initiative 17 Oxford Street, Jefferson 357 Cambridge, MA 02138 P: 617-495-3388

4 years, 11 months

[Aspuru-Guzik Group List] July 17, 2:00pm - HQI Special Seminar - Matthew Nichols

by Ploucha, Clare

4 years, 11 months

[Aspuru-Guzik Group List] Group meeting July 11

by Riley Hickman

Hi all, Pascal will speak at the group meeting tomorrow. His title and abstract can be found below. We will meet in SS571 at 2:30pm. If you'd like to connect to the call via Skype, please let me know. Thanks, Riley Title: Machine learning of reaction barriers, genetic algorithms and chemical intuition Abstract: This talk will give an overview of our (Gabe, Akshat, me and others) recent work on the prediction of activation energies of chemical reactions, the design of phosphine ligands, genetic algorithms based on our recently developed SELFIES representation of molecules and a combination of all to extract chemical intuition and design rules from machine learning approaches.

4 years, 11 months

[Aspuru-Guzik Group List] Group meeting June 27

by Riley Hickman

Hi all, Just to avoid any confusion the group meeting tomorrow will be Martin Seifrid's talk. See Andrés' post in #general for more details. Riley

4 years, 12 months

[Aspuru-Guzik Group List] Group meeting June 20

by Riley Hickman

Hi all, Martha will present at the group meeting tomorrow. Her title and abstract can be found below. We will meet in SS571 at 2:30pm. If you would like to connect to the meeting via Skype, please send me your information. Best, Riley ------------------------------------------ Title: Exploration of 2,2’-bipyridines as electroactive compounds in flow batteries Abstract: I will talk about compounds from the 2,2’-bipyridine family that were investigated to be used as electro-active materials in flow batteries. Calculations on redox potential, pKa and solubility were performed on a small subset of derivatives finding some promising molecules for potential application as negative redox-active electrolytes. Also, in combination with ML approaches such as Phoenics/Gryffin that allows the exploration of the molecular space in an efficient way, the search can be guided towards the discovery of new electrolytes.

5 years

[Aspuru-Guzik Group List] Group meeting June 13

by Riley Hickman

Hi all, Jakob will present at group meeting tomorrow. Abstract can be found below. We will meet in SS571 at 2:30pm. If you would like to join the meeting via Skype, please let me know. Best, Riley ----------------------------------------------------------- Abstract: I'm going to give a gentle introduction about the compression of quantum states with emphasis on encoded chemical systems into qubits and some potential applications and strategies associated with it.

5 years

[Aspuru-Guzik Group List] Group meeting June 5

by Riley Hickman

Hi all, Ian will speak at the group meeting tomorrow. His title and abstract can be found below. We will meet in SS571 at 2:30pm. Please be on time. If you'd like to connect via Skype, let me know. Best, Riley ---------------------------------------------- Title: Phase estimation with randomized Hamiltonians Abstract: Phase estimation is commonly used in quantum simulation to estimate Hamiltonian eigenenergies. However, not all terms in the Hamiltonian contribute equally to the energy. Motivated by this, I will discuss theoretical and numerical work allowing us to reduce the cost of phase estimation by changing how frequently different Hamiltonian terms are simulated. The same approach also allows us to better understand the errors in different simulation approaches.

5 years

[Aspuru-Guzik Group List] Group meeting May 30

by Riley Hickman

Hi all, Loïc will speak at tomorrow's group meeting. His title and abstract can be found below. We will meet in SS571 at 2:30pm. Please be on time. If you would like to join the meeting via Skype, let me know. Best, Riley ------------------------------------------------------- Title: Autonomous experimentation with ChemOS Abstract: I will describe different approaches to design experimental campaigns in the context of autonomous experimentation with the self-driving laboratories. Notably, I will detail new and old features of ChemOS, a modular software package which facilitates the deployment and orchestration of the self-driving laboratories. Through various experiments, I will highlight different aspects of ChemOS.

5 years

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