Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Mitigating Depolarizing Noise on Quantum Computers with Noise-Estimation Circuits.
M. Urbánek, B. Nachman, V. Pascuzzi +3 more·Mar 15, 2021
A significant problem for current quantum computers is noise. While there are many distinct noise channels, the depolarizing noise model often appropriately describes average noise for large circuits involving many qubits and gates. We present a meth...
Interleaving: Modular architectures for fault-tolerant photonic quantum computing
H. Bombin, Isaac H. Kim, D. Litinski +5 more·Mar 15, 2021
Useful fault-tolerant quantum computers require very large numbers of physical qubits. Quantum computers are often designed as arrays of static qubits executing gates and measurements. Photonic qubits require a different approach. In photonic fusion-...
QFAST: Conflating Search and Numerical Optimization for Scalable Quantum Circuit Synthesis
Ed Younis, Koushik Sen, K. Yelick +1 more·Mar 12, 2021
We present a topology aware quantum synthesis algorithm designed to produce short circuits and to scale well in practice. The main contribution is a novel representation of circuits able to encode placement and topology using generic "gates", which a...
Constant-depth circuits for dynamic simulations of materials on quantum computers
Lindsay Bassman Oftelie, Roel Van Beeumen, Ed Younis +3 more·Mar 12, 2021
Dynamic simulation of materials is a promising application for near-term quantum computers. Current algorithms for Hamiltonian simulation, however, produce circuits that grow in depth with increasing simulation time, limiting feasible simulations to ...
Low-Overhead Fault-Tolerant Quantum Error Correction with the Surface-GKP Code
Kyungjoo Noh, C. Chamberland, F. Brandão·Mar 11, 2021
Fault-tolerant quantum error correction is essential for implementing quantum algorithms of significant practical importance. In this work, we propose a highly effective use of the surface-GKP code, i.e., the surface code consisting of bosonic GKP qu...
A semi-agnostic ansatz with variable structure for variational quantum algorithms
Matías Bilkis, M. Cerezo, Guillaume Verdon +2 more·Mar 11, 2021
Quantum machine learning—and specifically Variational Quantum Algorithms (VQAs)—offers a powerful, flexible paradigm for programming near-term quantum computers, with applications in chemistry, metrology, materials science, data science, and mathemat...
Quantum Algorithms in Cybernetics
Petar Nikolov·Mar 10, 2021
A new method for simulation of a binary homogeneous Markov process using a quantum computer was proposed. This new method allows using the distinguished properties of the quantum mechanical systems -- superposition, entanglement and probability calcu...
Fast Simulation of Bosonic Qubits via Gaussian Functions in Phase Space
J. Bourassa, N. Quesada, I. Tzitrin +6 more·Mar 9, 2021
Bosonic qubits are a promising route to building fault-tolerant quantum computers on a variety of physical platforms. Studying the performance of bosonic qubits under realistic gates and measurements is challenging with existing analytical and numeri...
Hardware error correction for programmable photonics
S. Bandyopadhyay, R. Hamerly, D. Englund·Mar 8, 2021
Programmable photonic circuits of reconfigurable interferometers can be used to implement arbitrary operations on optical modes, facilitating a flexible platform for accelerating tasks in quantum simulation, signal processing, and artificial intellig...
Error Mitigation for Universal Gates on Encoded Qubits.
C. Piveteau, David Sutter, S. Bravyi +2 more·Mar 8, 2021
The Eastin-Knill theorem states that no quantum error-correcting code can have a universal set of transversal gates. For Calderbank-Shor-Steane codes that can implement Clifford gates transversally, it suffices to provide one additional non-Clifford ...
Theoretical Realization of a Two Qubit Quantum Controlled-NOT Logic Gate and a Single Qubit Quantum Hadamard Logic Gate in the Anti-Jaynes-Cummings Model
Christopher Mayero, J. Omolo, S. Okeyo·Mar 4, 2021
Quantum gates are fundamental in Quantum computing for their role in manipulating elementary information carriers referred to as quantum bits. In this paper, a theoretical scheme for realizing a quantum Hadamard and a quantum controlled-NOT logic gat...
Filter Functions for Quantum Processes under Correlated Noise.
Pascal Cerfontaine, Tobias Hangleiter, H. Bluhm·Mar 3, 2021
Many qubit implementations are afflicted by correlated noise not captured by standard theoretical tools that are based on Markov approximations. While independent gate operations are a key concept for quantum computing, it is actually not possible to...
Filter-function formalism and software package to compute quantum processes of gate sequences for classical non-Markovian noise
Tobias Hangleiter, Pascal Cerfontaine, H. Bluhm·Mar 3, 2021
Correlated, non-Markovian noise is present in many solid-state systems employed as hosts for quantum information technologies, significantly complicating the realistic theoretical description of these systems. In this regime, the effects of noise on ...
Stim: a fast stabilizer circuit simulator
C. Gidney·Mar 3, 2021
This paper presents “Stim", a fast simulator for quantum stabilizer circuits. The paper explains how Stim works and compares it to existing tools. With no foreknowledge, Stim can analyze a distance 100 surface code circuit (20 thousand qubits, 8 mill...
Quantum-dot-based deterministic photon–emitter interfaces for scalable photonic quantum technology
R. Uppu, L. Midolo, Xiaoyan Zhou +2 more·Mar 1, 2021
The scale-up of quantum hardware is fundamental to realize the full potential of quantum technology. Among a plethora of hardware platforms, photonics stands out: it provides a modular approach where the main challenges lie in the construction of hig...
Behavior of Analog Quantum Algorithms.
L. Brady, L. Kocia, P. Bienias +3 more·Mar 1, 2021
Analog quantum algorithms are formulated in terms of Hamiltonians rather than unitary gates and include quantum adiabatic computing, quantum annealing, and the quantum approximate optimization algorithm (QAOA). These algorithms are promising candidat...
Cross-Cross Resonance Gate
K. Heya, Naoki Kanazawa·Feb 26, 2021
Implementation of high-fidelity swapping operations is of vital importance to execute quantum algorithms on a quantum processor with limited connectivity. We present an efficient pulse control technique, cross-cross resonance (CCR) gate, to implement...
Entanglement across separate silicon dies in a modular superconducting qubit device
Alysson Gold, J. Paquette, A. Stockklauser +15 more·Feb 26, 2021
Assembling future large-scale quantum computers out of smaller, specialized modules promises to simplify a number of formidable science and engineering challenges. One of the primary challenges in developing a modular architecture is in engineering h...
Randomized Benchmarking with Stabilizer Verification and Gate Synthesis
E. Derbyshire, R. Mezher, Theodoros Kapourniotis +1 more·Feb 25, 2021
Recently, there has been an emergence of useful applications for noisy intermediate-scale quantum (NISQ) devices notably, though not exclusively, in the fields of quantum machine learning and variational quantum algorithms. In such applications, circ...
Logical-qubit operations in an error-detecting surface code
J. Marques, B. Varbanov, M. Moreira +10 more·Feb 25, 2021
Future fault-tolerant quantum computers will require storing and processing quantum data in logical qubits. Here we realize a suite of logical operations on a distance-2 surface code qubit built from seven physical qubits and stabilized using repeate...