PsiQuantum Announces Breakthrough in Architectures for Error-Corrected QuantumComputing
We recently announced a new approach to vastly increasing the efficiency of running quantum algorithms. We call it the Active Volume Architecture…
PsiQuantum’s approach to Fault-tolerance “Fusion-based quantum computation” published in Nature Communications as an Editor's highlight.
Fusion based quantum computation (FBQC) is designed to implement fault-tolerant quantum computing with the photonic hardware used at PsiQuantum…
A world-first scalable framework for decoding, capable of supporting PsiQuantum’s first generation of fault-tolerant quantum computers.
Over the past three decades significant reductions have been made to the cost of estimating ground-state energies of molecular Hamiltonians with quantum computers….
Demonstration of an all-optical quantum controlled-NOT gate
The promise of tremendous computational power, coupled with the development of robust error-correcting schemes, has fuelled extensive efforts to build a quantum computer.
Author: J. L. O'Brien, G. J. Pryde, A. G. White, T. C. Ralph & D. Branning, Nature volume 426, pages 264–267 - Published: Nov 20, 2003
Optical quantum computing
In 2001, all-optical quantum computing became feasible with the discovery that scalable quantum computing is possible using only single-photon sources, linear optical elements, and single-photon detectors.
Author: Jeremy O'Brien, Science Vol. 318, Issue 5856 - Published: Dec 07, 2007
Silica-on-Silicon waveguide quantum circuits
Quantum technologies based on photons will likely require an integrated optics architecture for improved performance, miniaturization, and scalability.
Author: Politi et al. Science Vol. 320, Issue 5876, pp. 646-649 - Published: May 02, 2008
All authors: Alberto Politi, Martin J. Cryan, John G. Rarity, Siyuan Yu, Jeremy L. O'Brien
High-fidelity operation of quantum photonic circuits
We demonstrate photonic quantum circuits that operate at the stringent levels that will be required for future quantum information science and technology. These circuits are fabricated from silica-on-silicon waveguides forming directional couplers and interferometers.
Author: Laing et al. Appl. Phys. Lett. 97, 211109 - Published: Jun 17, 2010
All authors: Anthony Laing, Alberto Peruzzo, Alberto Politi, Maria Rodas Verde, Matthaeus Halder, Timothy C. Ralph, Mark G. Thompson, Jeremy L. O’Brien
Generating, manipulating and measuring entanglement and mixture with a reconfigurable photonic circuit
Entanglement is the quintessential quantum-mechanical phenomenon understood to lie at the heart of future quantum technologies and the subject of fundamental scientific investigations.
Author: Shadbolt et al. Nature Photon 6, 45–49 - Published: Dec 11, 2011
All authors: P. J. Shadbolt, M. R. Verde, A. Peruzzo, A. Politi, A. Laing, M. Lobino, J. C. F. Matthews, M. G. Thompson, J. L. O'Brien
A variational eigenvalue solver on a photonic quantum processor
Quantum computers promise to efficiently solve important problems that are intractable on a conventional computer. For quantum systems, where the physical dimension grows exponentially, finding the eigenvalues of certain operators is one such intractable problem and remains a fundamental challenge.
Author: Peruzzo et al. Nat Commun 5, 4213 - Published: Jun 23, 2014
All authors: Alberto Peruzzo, Jarrod McClean, Peter Shadbolt, Man-Hong Yung, Xiao-Qi Zhou, Peter J. Love, Alán Aspuru-Guzik, Jeremy L. O’Brien
Universal linear optics
Encoding and manipulating information in the states of single photons provides a potential platform for quantum computing and communication.
Author: Carolan et al. Science Vol. 349, Issue 6249, pp. 711-716 - Published: Aug 14, 2015
All authors: Jacques Carolan, Christopher Harrold, Chris Sparrow, Enrique Martín-López, Nicholas J. Russell, Joshua W. Silverstone, Peter J. Shadbolt, Nobuyuki Matsuda, Manabu Oguma, Mikitaka Itoh, Graham D. Marshall, Mark G. Thompson, Jonathan C. F. Matthews, Toshikazu Hashimoto, Jeremy L. O’Brien, Anthony Laing
Chip-to-chip quantum photonic interconnect by path-polarization interconversion
Integrated photonics has enabled much progress toward quantum technologies. Many applications, e.g., quantum communication, sensing, and distributed cloud quantum computing, require coherent photonic interconnection between separate on-chip subsystems.
Author: Wang et al. Optica Vol. 3, Issue 4, pp. 407-413 - Published: Sep 26, 2015
All authors: Jianwei Wang, Damien Bonneau, Matteo Villa, Joshua W. Silverstone, Raffaele Santagati, Shigehito Miki, Taro Yamashita, Mikio Fujiwara, Masahide Sasaki, Hirotaka Terai, Michael G. Tanner, Chandra M. Natarajan, Robert H. Hadfield, Jeremy L. O’Brien, Mark G. Thompson
Large-scale silicon quantum photonics implementing arbitrary two-qubit processing
Photonics is a promising platform for implementing universal quantum information processing. Its main challenges include precise control of massive circuits of linear optical components and effective implementation of entangling operations on photons.
Author: Qiang et al. Nature Photonics volume 12, pages 534–539 - Published: Aug 20, 2018
All authors: Xiaogang Qiang, Xiaoqi Zhou, Jianwei Wang, Callum M. Wilkes, Thomas Loke, Sean O’Gara, Laurent Kling, Graham D. Marshall, Raffaele Santagati, Timothy C. Ralph, Jingbo B. Wang, Jeremy L. O’Brien, Mark G. Thompson, Jonathan C. F. Matthews
Programmable four-photon graph states on a silicon chip
Future quantum computers require a scalable architecture on a scalable technology—one that supports millions of high-performance components. Measurement-based protocols, using graph states, represent the state of the art in architectures for optical quantum computing.
Author: Adcock et al. Nature Communications volume 10, Article number: 3528 - Published: Aug 06, 2019
All authors: Jeremy C. Adcock, Caterina Vigliar, Raffaele Santagati, Joshua W. Silverstone, Mark G. Thompson
Integrated photonic quantum technologies
Quantum technologies comprise an emerging class of devices capable of controlling superposition and entanglement of quantum states of light or matter, to realize fundamental performance advantages over ordinary classical machines.
Author: Wang et al. Nature Photonics volume 14, pages 273–284 - Published: Oct 21, 2019
All authors: Jianwei Wang, Fabio Sciarrino, Anthony Laing, Mark G. Thompson
Chip-to-chip quantum teleportation and multi-photon entanglement in silicon
Exploiting semiconductor fabrication techniques, natural carriers of quantum information such as atoms, electrons, and photons can be embedded in scalable integrated devices. Integrated optics provides a versatile platform for large-scale quantum information processing and transceiving with photons. Scaling up the integrated devices for quantum applications requires highperformance single-photon generation and photonic qubit-qubit entangling operations.
Author: Llewellyn et al. - Published: Nov 15, 2019
All authors: Daniel Llewellyn, Yunhong Ding, Imad I. Faruque, Stefano Paesani, Davide Bacco, Raffaele Santagati, Yan-Jun Qian, Yan Li, Yun-Feng Xiao, Marcus Huber, Mehul Malik, Gary F. Sinclair, Xiaoqi Zhou, Karsten Rottwitt, Jeremy L. O Brien, John G. Rarity, Qihuang Gong, Leif K. Oxenlowe, Jianwei Wang, Mark G. Thompson
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
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
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
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.
Quantum-enhanced tomography of unitary processes: supplementary material
XQ Zhou, H Cable, R Whittaker, P Shadbolt, JL O’Brien, JCF Matthews
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