Alex Mack 18/05/2023 Alex Mack 18/05/2023

Error protected qubits in a silicon photonic chip

General purpose quantum computers can, in principle, entangle a number of noisy physical qubits to realise composite qubits protected against errors. Architectures for measurement-based quantum computing intrinsically support error-protected qubits and are the most viable approach for constructing an all-photonic quantum computer.

Author: Vigliar et al. - Published: Sep 17, 2020
All authors: Caterina Vigliar, Stefano Paesani, Yunhong Ding, Jeremy C. Adcock, Jianwei Wang, Sam Morley-Short, Davide Bacco, Leif K. Oxenløwe, Mark G. Thompson, John G. Rarity, Anthony Laing

Alex Mack 18/05/2023 Alex Mack 18/05/2023

Fast digital methods for adiabatic state preparation

We present quantum algorithms for adiabatic state preparation on a gate-based quantum computer, with complexity polylogarithmic in the inverse error. This constitutes an exponential improvement over existing methods, which achieve subpolynomial error dependence.

Author: Wan et al. - Published: Apr 08, 2020
All authors: Kianna Wan, Isaac Kim

Alex Mack 18/05/2023 Alex Mack 18/05/2023

Exponentially faster implementations of Select(H) for fermionic Hamiltonians

We present a simple but general framework for constructing quantum circuits that implement the multiply-controlled unitary Select(H)≡∑ℓ|ℓ⟩⟨ℓ|⊗Hℓ, where H=∑ℓHℓ is the Jordan-Wigner transform of an arbitrary second-quantised fermionic Hamiltonian.

Author: Kianna Wan - Published: Apr 08, 2020

Alex Mack 18/05/2023 Alex Mack 18/05/2023

A Jordan-Wigner gadget that reduces T count by more than 6x for quantum chemistry applications

Quantum computers have the potential to be a profoundly transformative technology, particularly in the context of quantum chemistry. However, running a chemistry application that is demonstrably useful currently requires a prohibitive number of logical operations.

Author: Sam Pallister - Published: Apr 10, 2020

Alex Mack 18/05/2023 Alex Mack 18/05/2023

Fault-tolerant resource estimate for quantum chemical simulations: Case study on Li-ion battery electrolyte molecules (arXiv.org)

In this article, we estimate the cost of simulating electrolyte molecules in Li-ion batteries on a fault-tolerant quantum computer, focusing on the molecules that can provide practical solutions to industrially relevant problems.

Author: Kim et al. - Published: Apr 21, 2021
All authors: Isaac H. Kim, Eunseok Lee, Ye-Hua Liu, Sam Pallister, William Pol, Sam Roberts

Alex Mack 18/05/2023 Alex Mack 18/05/2023

Fault-tolerant resource estimate for quantum chemical simulations: Case study on Li-ion battery electrolyte molecules (PRR)

In this Physical Review Research (PRR) peer-reviewed technical paper we estimate the resources required in the fusion-based quantum computing scheme to simulate electrolyte molecules in Li-ion batteries on a fault-tolerant, photonic quantum computer.

Author: Kim et al. - Published: Apr 07, 2022
All authors: Isaac H. Kim, Ye-Hua Liu, Sam Pallister, William Pol, Sam Roberts, Eunseok Lee

Alex Mack 18/05/2023 Alex Mack 18/05/2023

Architectures for fault tolerant quantum computing

Naomi Nickerson - QIP2021

Naomi Nickerson, Sr Director of Quantum Architecture at PsiQuantum, introduces quantum error correction, what is needed for these theoretical concepts to be applied in real systems, and how this translates into principles for quantum architectural design.

Alex Mack 18/05/2023 Alex Mack 18/05/2023

Silicon photonic quantum computing

Jeremy O'Brien - APS March meeting 2021

PsiQuantum CEO Jeremy O’Brien outlines how, by the middle of this decade, PsiQuantum will have completely stood up all the manufacturing lines and processes necessary to begin assembling a final machine: a fault-tolerant, error-corrected quantum computer with hundreds of logical qubits and billions of gates.