IBM Quantum

May 15, 2024 | link.aps.org | Youngseok Kim |IBM Quantum |Yorktown Heights

Abstract Chiral edge states in a quantum Hall effect are the paradigmatic example of a quasiparticle with chirality. In even space-time dimensions, the Nielsen-Ninomiya theorem strictly forbids chiral states in physical isolation. The exceptions to this theorem only occur in the presence of nonlocality, non-Hermiticity, or by embedding the system at the boundary of the higher-dimensional bulk.

Feb 8, 2024 | link.aps.org | Joseph T. Iosue |Kunal Sharma |IBM Quantum |Yorktown Heights

Popular Summary Physical quantum systems are often described by an infinite number of degrees of freedom. Such systems often offer advantages over finite-dimensional systems for various applications in quantum communication and computation. However, since finite-dimensional systems are typically much simpler to analyze, many tools and techniques have been developed for finite-dimensional quantum information that have not yet been applied to infinite-dimensional systems.

Aug 2, 2023 | link.aps.org | Ammar Kirmani |Derek Wang |IBM Quantum |Pouyan Ghaemi

Abstract Direct experimental detection of anyonic exchange statistics in fractional quantum Hall systems by braiding the excitations and measuring the wave-function phase is an enormous challenge. Here, we use a small, noisy quantum computer to emulate direct braiding within the framework of a simplified model applicable to a thin cylinder geometry and measure the topological phase. Our algorithm first prepares the ground state with two quasiholes.

Jul 28, 2023 | link.aps.org | Arkopal Dutt |Edwin Pednault |IBM Quantum |Yorktown Heights

Abstract Hamiltonian learning is an important procedure in quantum system identification, calibration, and successful operation of quantum computers. Through queries to the quantum system, this procedure seeks to obtain the parameters of a given Hamiltonian model and description of noise sources. Standard techniques for Hamiltonian learning require careful design of queries and O(ε−2) queries in achieving learning error ε due to the standard quantum limit.

Mar 15, 2023 | link.aps.org | IBM Quantum |Yorktown Heights |Matthew Treinish

Popular Summary Dealing with the noise inherent in today’s nascent quantum computers is a very lively area of research.