Events

LDPC Quantum Codes: Recent Developments, Challenges and Opportunities

Nikolas Breuckmann, University College London

Quantum error correction is an indispensable ingredient for scalable quantum computing. We discuss a particular class of quantum codes called "quantum low-density parity-check (LDPC) codes." The codes we discuss are alternatives to the surface code, which is currently the leading candidate to implement quantum fault tolerance. We discuss the zoo of quantum LDPC codes and discuss their potential for making quantum computers robust with regard to noise.

Topological quantum codes and quantum computation

Aleksander Kubica, AWS Center for Quantum Computing & California Institute of Technology

Quantum computers are one of the central pillars of quantum information science. However, designing them is a daunting task that will require the implementation of fault-tolerant protocols and quantum error-correcting codes. In this talk, I will present a realistic and resource-efficient approach to building scalable quantum computers based on topological quantum codes.

From Andreev Bound States to Majorana Bound States: Experimental Signatures in Nanowire Devices

In the last decade, topological superconductors have enjoyed enormous interest due to their possible application in quantum computing, as well as the relative accessibility of recipes claiming to realize this novel form of matter without use of exotic materials.

Dequantizing the Quantum Singular Value Transformation: Hardness and Applications to Quantum Chemistry and the Quantum PCP Conjecture

Sevag Gharibian, Paderborn University

The Quantum Singular Value Transformation (QSVT) is a recent technique that gives a unified framework to describe most quantum algorithms discovered so far, and may lead to the development of novel quantum algorithms. In this paper we investigate the hardness of classically simulating the QSVT.

Ultrafast single photon optical gating via the Kerr effect

In optical quantum communication and information protocols, it is important to have access to a high dimensional Hilbert space. The energy-time degree of freedom of photons may be used to access such a Hilbert space, as long as accurate measures of frequency and time of single photons are possible. With ultrafast timescales, it is known how to measure the phase of an electric field as a function of time, but new techniques are required for the low power, single photon regime.

Quantum Linear Solvers and Their Applications

I will talk about the quantum algorithms developed by block-encoding techniques for solving linear system of equations. We will see what sorts of speed-ups have been proved or could be expected, while exploiting a quantum linear solver as a subroutine, for tasks ranging from solving PDEs to sampling from Gibbs distributions.

Join the seminar on Zoom or in QNC 1201!
Meeting link: IQC Student Seminar

Xiao Mi, Google

A fertile ground of exploration for NISQ quantum computers is the study of quantum phases and their associated transitions into chaotic regimes. Sharp growths of quantum correlation and entanglement often accompany quantum phases near their critical points, providing opportunities for quantum computational advantage. Furthermore, the discovery of any robust quantum order in, for example, topological phases of matter may also enable new error-correction paradigms. I will present two recent experiments studying quantum phases of matter with superconducting qubits.

Impromptu Poster Session

Students joining will be divided into groups and discuss each other's current work using the whiteboard. 

Join the seminar in QNC 1201!

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IQC Alum Lecture Series: Ben Criger, Cambridge Quantum

The possibility for quantum computers to outcompete classical high-performance computers at their own game looms tantalizingly on the horizon. The main obstacle to performing large-scale computations remains the cascade of small inaccuracies on individual components throughout large quantum circuits. Since the 1990s, techniques have been invented for suppressing these errors, principally within academia.

Communication networks are an essential part of our world today, used in transactions from banking to education, global business exchanges to defence. What happens when our private information is no longer private? Powerful quantum computers will have the ability to crack the encryption of public keys that we currently use to secure our data, putting our privacy at risk.