EE Student Information

The Department of Electrical Engineering supports Black Lives Matter. Read more.

• • • • •

EE Student Information, Spring Quarter through Academic Year 2020-2021: FAQs and Updated EE Course List.

Updates will be posted on this page, as well as emailed to the EE student mail list.

Please see Stanford University Health Alerts for course and travel updates.

As always, use your best judgement and consider your own and others' well-being at all times.

QFarm

QFarm Quantum Seminar Series

Q-FARM presents "Large-Scale Quantum Photonic Processors"

Topic: 
Large-Scale Quantum Photonic Processors
Abstract / Description: 

Photons play a central role in many areas of quantum information science, either as qubit themselves or to mediate interactions between long-lived matter based qubits. Techniques for (1) high-fidelity generation, (2) precise manipulation and (3) ultra-efficient detection of quantum states of light are therefore a prerequisite for virtually all quantum technologies. A quantum photonic processor is the union of these three core technologies into a single system, and, bolstered by advances in integrated photonics, promises to be a versatile platform for quantum information science and beyond. In this talk I present recent progress towards large-scale quantum photonic processors and demonstrate how such systems enable new applications at the nexus of quantum mechanics and machine learning.

Date and Time: 
Wednesday, August 5, 2020 - 12:00pm
Venue: 
ZOOM ID: 987 676 025

Q-FARM presents "Quantum Metrology in the Era of Quantum Information"

Topic: 
Quantum Metrology in the Era of Quantum Information
Abstract / Description: 

I will review the most recent advances in the theoretical methods of quantum metrology, focusing on the quantum information related concepts such as quantum error-correction and matrix product states formalism. The aim of the talk is to show how the two fields, quantum metrology and quantum information, are closely connected and how they can benefit from each other. The talk will be based on three papers:

[1] R. Demkowicz-Dobrzanski, J. Czajkowski, P. Sekatski, Adaptive quantum metrology under general Markovian noise, Phys. Rev. X 7, 041009 (2017)

[2] K. Chabuda, J. Dziarmaga, T. J. Osborne, R.Demkowicz-Dobrzanski, Tensor-Network Approach for Quantum Metrology in Many-Body Quantum Systems, Nat. Commun. 11, 250 (2020)

[3] A. Kubica, R. Demkowicz-Dobrzanski, Using Quantum Metrological Bounds in Quantum Error Correction: A Simple Proof of the Approximate Eastin-Knill Theorem, arXiv:2004.11893 (2020)

 

Password via qfarm-contact@stanford.edu

Date and Time: 
Wednesday, July 22, 2020 - 10:00am
Venue: 
Meeting ID: 987 676 025; + password)

Q-FARM presents "Quantum Multiplexing: It's about time"

Topic: 
Quantum Multiplexing: It's about time
Abstract / Description: 

Despite their many applications over the last decades, entangled and single-photon sources from probabilistic sources such as spontaneous parametric downconversion have limited performance due to the presence of unwanted multi-pair events. For example, it is not possible to produce a heralded single photon with a probability exceeding 25%. However, by incorporating low-loss multiplexing (in our case, time-bin multiplexing), one can greatly enhance device performance. We will review our recent work in this area, and speculate about the future.

Date and Time: 
Wednesday, June 24, 2020 - 12:00pm
Venue: 
Zoom

Q-FARM presents "Many-body invariants from statistical correlations of randomized measurements"

Topic: 
Many-body invariants from statistical correlations of randomized measurements
Abstract / Description: 

With the advances of quantum simulators in implementing various quantum many-body states, it is important to find efficient ways to characterize and measure many-body states, without resorting to full quantum state tomography. Specifically, in contrast to electronic materials, where the measurements are mainly within the linear-response paradigm, quantum simulators offer unique access to the full wave function that inspires novel probing approaches. In this talk, I discuss how various quantities, such as entanglement spectrum, symmetry-protected topological invariants, and fractional many-body Chern number could be extracted. In the latter case, we show how such an invariant can be measured, using a single wave function, without the knowledge of the Hamiltonian. This should be contrasted to the conventional way, where on requires a family of many-body wave functions parameterized by twist angles in order to calculate the Berry curvature.

Science Advance 6, 3666 (2020)
arxiv 2005.13543
arxiv 2005.13677

Date and Time: 
Wednesday, June 17, 2020 - 12:00pm
Venue: 
Zoom ID: 987 676 025

QFARM Quantum Seminar Series presents "Robust Quantum Information Processing with Bosonic Modes"

Topic: 
Robust Quantum Information Processing with Bosonic Modes
Abstract / Description: 

Bosonic modes are widely used for quantum communication and information processing. Recent developments in superconducting circuits enable us to control bosonic microwave cavity modes and implement arbitrary operations allowed by quantum mechanics, such as quantum error correction against excitation loss errors. We investigate various bosonic codes, error correction schemes, and potential applications.

Date and Time: 
Wednesday, May 27, 2020 - 12:00pm
Venue: 
Zoom ID: 987 676 025

Q-FARM presents "Topological error correction in linear optical quantum computing"

Topic: 
Topological error correction in linear optical quantum computing
Abstract / Description: 

In linear optical quantum computing qubits do not fundamentally interact, and yet via measurement complex entanglement can be constructed to implement quantum error corrected computation via topological codes. As a hardware platform for quantum computation linear optics offers unique flexibility in the options for building up topological error correcting schemes. Some interesting examples are the long range connectivity which is straightforward in a photonic architecture, and the ability to move qubits around in temporal as well as spatial dimensions. I will give an overview of quantum computing with silicon photonics and demonstrate how these physical features of the photonic approach can inspire novel schemes for fault tolerance.

Date and Time: 
Monday, May 11, 2020 - 11:05am to 12:05pm
Venue: 
Zoom id: 987-676-025

Seminar in Condensed Matter Physics presents "Symmetry and topology of quasiparticles and their bound states in correlated insulators"

Topic: 
Symmetry and topology of quasiparticles and their bound states in correlated insulators
Abstract / Description: 

In this talk, I explore two examples of how the symmetry of a microscopic lattice or topology of an underlying non-interacting band structure can be imprinted in the excitations of strongly-correlated insulators. First, I show that previously-unnoticed crystal symmetry constraints drastically alter the understanding of Ising quantum criticality in the quasi-1D magnetic insulator CoNb2O6, resolving decade-old puzzles related to the dispersion of confined 'kinks' in the ordered phase and the decay of spin-flip quasiparticles in the paramagnetic phase [1]. Turning next to the correlated quantum anomalous Hall insulator recently observed in twisted bilayer graphene near the magic angle, I show that this state supports stable, weakly-dispersing flat bands of neutral bosonic excitons with substantial Berry curvature [2], and argue that these can under certain conditions form a new hierarchy of bosonic fractional quantum Hall liquids [3].

References:
[1] M. Fava, R. Coldea, and S.A. Parameswaran, arXiv:2004.04169 (2020).
[2] Y.H. Kwan, Y. Hu, S.H. Simon, and S.A. Parameswaran, arXiv:2003.11560 (2020).
[3] Y.H. Kwan, Y. Hu, S.H. Simon, and S.A. Parameswaran, arXiv:2003.11559 (2020).

Date and Time: 
Thursday, May 7, 2020 - 12:00pm
Venue: 
Zoom (email vkhemani for link)

Stanford Institute for Theoretical Physics presents "Void formation in operator growth, quantum chaos and black hole evaporation"

Topic: 
Void formation in operator growth, quantum chaos and black hole evaporation
Abstract / Description: 

I first introduce the concept of void formation in Heisenberg evolution of operators and provide support that it can be used to distinguish chaotic and integrable systems.

After a brief discussion of applications of void formation to entanglement growths and generation of multi-partite entanglement, I will explain how it can provide insights into evolution of black holes by considering some simple quantum mechanical toy models of black hole evaporation.

Date and Time: 
Monday, May 4, 2020 - 2:00pm
Venue: 
Zoom id: 165-492-015

Stanford Institute for Theoretical Physics presents "Continuum Quantum Field Theories for Fractons"

Topic: 
Continuum Quantum Field Theories for Fractons
Abstract / Description: 

Starting with a lattice system at short distances, its long-distance behavior is captured by a continuum Quantum Field Theory (QFT). This description is universal, i.e. it is independent of most of the details of the microscopic system. Surprisingly, certain recently discovered lattice systems, and in particular models of fractons, seem to violate this general dogma. Motivated by this apparent contradiction, we will present exotic continuum QFTs that describe these systems.

Date and Time: 
Monday, April 27, 2020 - 2:00pm
Venue: 
Zoom ID: 165 492 015

Pages

Subscribe to RSS - QFarm