Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Influence of errors on the transport of quantum information through distant quantum dot spin qubits
Iann Cunha, L. Castelano·Aug 5, 2022
The ability to connect distant qubits plays a fundamental role in quantum computing. Therefore, quantum systems candidates for quantum computation must be able to interact all their constituent qubits. Here, we model the quantum dot spin qubits by a ...
Quantum Error Correction Via Noise Guessing Decoding
Diogo Cruz, F. A. Monteiro, B. Coutinho·Aug 4, 2022
Quantum error correction codes (QECCs) play a central role in both quantum communications and quantum computation. Practical quantum error correction codes, such as stabilizer codes, are generally structured to suit a specific use, and present rigid ...
Implementing Fault-tolerant Entangling Gates on the Five-qubit Code and the Color Code
C. Ryan-Anderson, N. C. Brown, M. S. Allman +34 more·Aug 3, 2022
We compare two different implementations of fault-tolerant entangling gates on logical qubits. In one instance, a twelve-qubit trapped-ion quantum computer is used to implement a non-transversal logical CNOT gate between two five qubit codes. The ope...
NAPA: Intermediate-Level Variational Native-Pulse Ansatz for Variational Quantum Algorithms
Zhiding Liang, Jinglei Cheng, Hang Ren +8 more·Aug 2, 2022
Variational quantum algorithms (VQAs) have demonstrated great potentials in the noisy intermediate scale quantum (NISQ) era. In the workflow of VQA, the parameters of ansatz are iteratively updated to approximate the desired quantum states. We have s...
Techniques for combining fast local decoders with global decoders under circuit-level noise
C. Chamberland, L. Gonçalves, P. Sivarajah +2 more·Aug 2, 2022
Implementing algorithms on a fault-tolerant quantum computer will require fast decoding throughput and latency times to prevent an exponential increase in buffer times between the applications of gates. In this work we begin by quantifying these requ...
Simulating Quantum Circuits Using Efficient Tensor Network Contraction Algorithms with Subexponential Upper Bound.
T. Wahl, Sergii Strelchuk·Aug 2, 2022
We derive a rigorous upper bound on the classical computation time of finite-ranged tensor network contractions in d≥2 dimensions. Consequently, we show that quantum circuits of single-qubit and finite-ranged two-qubit gates can be classically simula...
Realizing two-qubit gates through mode engineering on a trapped-ion quantum computer
Ming Li, N. Nguyen, Alaina M. Green +3 more·Aug 2, 2022
Two-qubit gates are a fundamental constituent of a quantum computer and typically its most challenging operation. In a trapped-ion quantum computer, this is typically implemented with laser beams which are modulated in amplitude, frequency, phase, or...
Quantum multi-programming for Grover’s search
Gilchan Park, Kun Zhang, Kwangmin Yu +1 more·Jul 29, 2022
Quantum multi-programming is a method utilizing contemporary noisy intermediate-scale quantum computers by executing multiple quantum circuits concurrently. Despite early research on it, the research remains on quantum gates or small-size quantum alg...
QuCloud+: A Holistic Qubit Mapping Scheme for Single/Multi-programming on 2D/3D NISQ Quantum Computers
Lei Liu, Xinglei Dou·Jul 29, 2022
Qubit mapping for NISQ superconducting quantum computers is essential to fidelity and resource utilization. The existing qubit mapping schemes meet challenges, e.g., crosstalk, SWAP overheads, diverse device topologies, etc., leading to qubit resourc...
Simulation of Interaction-Induced Chiral Topological Dynamics on a Digital Quantum Computer.
Jin Ming Koh, Tommy Tai, Ching Hua Lee·Jul 28, 2022
Chiral edge states are highly sought after as paradigmatic topological states relevant to both quantum information processing and dissipationless electron transport. Using superconducting transmon-based quantum computers, we demonstrate chiral topolo...
Random Quantum Circuits
M. Fisher, V. Khemani, A. Nahum +1 more·Jul 28, 2022
Quantum circuits—built from local unitary gates and local measurements—are a new playground for quantum many-body physics and a tractable setting to explore universal collective phenomena far from equilibrium. These models have shed light on longstan...
Performant coherent control: bridging the gap between high- and low-level operations on hardware
Daniel S. Lobser, Jay W. Van Der Wall, Joshua D. Goldberg·Jul 28, 2022
Scalable coherent control hardware for quantum information platforms is rapidly growing in priority as their number of available qubits continues to increase. As these systems scale, more calibration steps are needed, leading to challenges with syste...
Realizing a class of stabilizer quantum error correction codes using a single ancilla and circular connectivity
A. V. Antipov, E. Kiktenko, A. Fedorov·Jul 27, 2022
We describe a class of"neighboring-blocks"stabilizer quantum error correction codes and demonstrate that such class of codes can be implemented in a resource-efficient manner using a single ancilla and circular near-neighbor qubit connectivity. We pr...
Digital-Analog Co-Design of the Harrow-Hassidim-Lloyd Algorithm
Ana Martin, Rubén Ibarrondo, M. Sanz·Jul 27, 2022
The Harrow-Hassidim-Lloyd quantum algorithm was proposed to solve linear systems of equations $A\vec{x} = \vec{b}$ and it is the core of various applications. However, there is not an explicit quantum circuit for the subroutine which maps the inverse...
Response to"Exponential challenges in unbiasing quantum Monte Carlo algorithms with quantum computers"
Joonho Lee, D. Reichman, R. Babbush +4 more·Jul 27, 2022
A recent preprint by Mazzola and Carleo numerically investigates exponential challenges that can arise for the QC-QMC algorithm introduced in our work,"Unbiasing fermionic quantum Monte Carlo with a quantum computer."As discussed in our original pape...
Gate Based Implementation of the Laplacian with BRGC Code for Universal Quantum Computers
E. Rrapaj, K. McElvain, Chia-Cheng Chang +2 more·Jul 24, 2022
We study the gate-based implementation of the binary reflected Gray code (BRGC) and binary code of the unitary time evolution operator due to the Laplacian discretized on a lattice with periodic boundary conditions. We find that the resulting Trotter e...
A Multiscale Simulation Approach for Germanium-Hole-Based Quantum Processor
Tong Wu, Jing Guo·Jul 23, 2022
A multiscale simulation method is developed to model a quantum dot (QD) array of germanium (Ge) holes for quantum computing. Guided by 3-D numerical quantum device simulations of QD structures, an analytical model of the tunnel coupling between the n...
Trapped Ions as an Architecture for Quantum Computing
Gabriel P. L. M. Fernandes, A. C. Ricardo, F. R. Cardoso +1 more·Jul 23, 2022
In this paper we describe one of the most promising platforms for the construction of a universal quantum computer, which consists of a chain of $N$ ions trapped in a harmonic potential, whose internal states work out as qubits, and are coupled to co...
Tailgating quantum circuits for high-order energy derivatives
J. Ceroni, A. Delgado, S. Jahangiri +1 more·Jul 22, 2022
To understand the chemical properties of molecules, it is often important to study derivatives of energies with respect to nuclear coordinates or external fields. Quantum algorithms for computing energy derivatives have been proposed, but only limite...
Programmable N-body interactions with trapped ions
O. Katz, M. Cetina, C. Monroe·Jul 21, 2022
Trapped atomic ion qubits or effective spins are a powerful quantum platform for quantum computation and simulation, featuring densely connected and efficiently programmable interactions between the spins. While native interactions between trapped io...