Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Optimizing quantum gates towards the scale of logical qubits
P. Klimov, A. Bengtsson, C. Quintana +21 more·Aug 4, 2023
A foundational assumption of quantum error correction theory is that quantum gates can be scaled to large processors without exceeding the error-threshold for fault tolerance. Two major challenges that could become fundamental roadblocks are manufact...
Benchmarking Adaptative Variational Quantum Algorithms on QUBO Instances
G. Turati, Maurizio Ferrari Dacrema, P. Cremonesi·Aug 3, 2023
In recent years, Variational Quantum Algorithms (VQAs) have emerged as a promising approach for solving optimization problems on quantum computers in the NISQ era. However, one limitation of VQAs is their reliance on fixed-structure circuits, which m...
Measurement-induced criticality is tomographically optimal
A. Akhtar, Hong-ye Hu, Yi-Zhuang You·Aug 3, 2023
We develop a classical shadow tomography protocol utilizing the randomized measurement scheme based on hybrid quantum circuits, which consist of layers of two-qubit random unitary gates mixed with single-qubit random projective measurements. Unlike c...
Magic of quantum hypergraph states
Junjie Chen, Yuxuan Yan, You Zhou·Aug 3, 2023
Magic, or nonstabilizerness, characterizes the deviation of a quantum state from the set of stabilizer states, playing a fundamental role in quantum state complexity and universal fault-tolerant quantum computing. However, analytical and numerical ch...
Fast Equivalence Checking of Quantum Circuits of Clifford Gates
D. Thanos, T. Coopmans, A. Laarman·Aug 2, 2023
Checking whether two quantum circuits are equivalent is important for the design and optimization of quantum-computer applications with real-world devices. We consider quantum circuits consisting of Clifford gates, a practically-relevant subset of al...
Electrically-programmable frequency comb for compact quantum photonic circuits
Shakir Ullah, M. Tasgin, R. Ovali +1 more·Aug 1, 2023
Recent efforts have demonstrated the first prototypes of compact and programmable photonic quantum computers~(PQCs). Utilization of time-bin encoding in loop-like architectures enabled a programmable generation of quantum states and execution of diff...
Molecular Symmetry in VQE: A Dual Approach for Trapped-Ion Simulations of Benzene
J. Goings, Luning Zhao, J. Jakowski +2 more·Aug 1, 2023
Understanding complex chemical systems—such as biomolecules, catalysts, and novel materials—is a central goal of quantum simulations. Near-term strategies hinge on the use of variational quantum eigensolver (VQE) algorithms combined with a suitable a...
Toward Quantum Machine Translation of Syntactically Distinct Languages
M. Abbaszade, Mariam Zomorodi, V. Salari +1 more·Jul 31, 2023
The present study aims to explore the feasibility of language translation using quantum natural language processing algorithms on noisy intermediate-scale quantum (NISQ) devices. Classical methods in natural language processing (NLP) struggle with ha...
Two-Qubit Gate Set Tomography with Fewer Circuits
K. Rudinger, Corey I. Ostrove, Stefan K. Seritan +4 more·Jul 28, 2023
Gate set tomography (GST) is a self-consistent and highly accurate method for the tomographic reconstruction of a quantum information processor's quantum logic operations, including gates, state preparations, and measurements. However, GST's experime...
Quantum Kernel Estimation With Neutral Atoms For Supervised Classification: A Gate-Based Approach
M. Russo, Edoardo Giusto, B. Montrucchio·Jul 28, 2023
Quantum Kernel Estimation (QKE) is a technique based on leveraging a quantum computer to estimate a kernel function that is classically difficult to calculate, which is then used by a classical computer for training a Support Vector Machine (SVM). Gi...
Nonlocal photonic quantum gates over 7.0 km
Xiao Liu, Xiao-Min Hu, Tian-Xiang Zhu +9 more·Jul 28, 2023
Quantum networks provide a prospective paradigm to connect separated quantum nodes, which relies on the distribution of long-distance entanglement and active feedforward control of qubits between remote nodes. Such approaches can be utilized to const...
Assessing quantum dot SWAP gate fidelity using tensor network methods
Jacob R. Taylor, Nathan L. Foulk, Sankar Das Sarma·Jul 27, 2023
Advanced tensor network numerical methods are used to explore the fidelity of repeated SWAP operations on a system comprising 20-100 quantum dot spin qubits in the presence of valley leakage and electrostatic crosstalk. The fidelity of SWAP gates is ...
Quantum Computer Simulations at Warp Speed: Assessing the Impact of GPU Acceleration: A Case Study with IBM Qiskit Aer, Nvidia Thrust & cuQuantum
Jennifer Faj, Ivy Bo Peng, Jacob Wahlgren +1 more·Jul 27, 2023
Quantum computer simulators are crucial for the development of quantum computing. This work investigates GPU and multi-GPU systems' suitability and performance impact on a widely used simulation tool – the state vector simulator Qiskit Aer. In partic...
State preparation by shallow circuits using feed forward
H. Buhrman, Marten Folkertsma, B. Loff +1 more·Jul 27, 2023
Fault tolerant quantum computers repetitively apply a four-step procedure: First, perform a few one and two-qubit quantum gates. Second, perform a syndrome measurement on a subset of the qubits. Third, perform fast classical computations to establish...
Compressed Gate Characterization for Quantum Devices with Time-Correlated Noise
M. Gullans, M. Caranti, A. Mills +1 more·Jul 26, 2023
As quantum devices make steady progress towards intermediate scale and fault-tolerant quantum computing, it is essential to develop rigorous and efficient measurement protocols that account for known sources of noise. Most existing quantum characteri...
Single-flux-quantum-based qubit control with tunable driving strength
Kuang 匡 Liu 刘, Y. Wang 王, Bo 波 Ji 季 +3 more·Jul 26, 2023
Single-flux-quantum (SFQ) circuits have great potential in building cryogenic quantum-classical interfaces for scaling up superconducting quantum processors. SFQ-based quantum gates have been designed and realized. However, current control schemes ar...
Derivative Pricing using Quantum Signal Processing
N. Stamatopoulos, W. Zeng·Jul 26, 2023
Pricing financial derivatives on quantum computers typically includes quantum arithmetic components which contribute heavily to the quantum resources required by the corresponding circuits. In this manuscript, we introduce a method based on Quantum S...
Simulation of quantum algorithms using classical probabilistic bits and circuits
D. Yavuz, A. Yadav·Jul 26, 2023
We discuss a new approach to simulate quantum algorithms using classical probabilistic bits and circuits. Each qubit (a two-level quantum system) is initially mapped to a vector in an eight dimensional probability space (equivalently, to a classical ...
Calculating the Single-Particle Many-body Green's Functions via the Quantum Singular Value Transform Algorithm
Alexis Ralli, G. Greene‐Diniz, D. M. Ramo +1 more·Jul 25, 2023
The Quantum Singular Value Transformation (QSVT) is a technique that provides a unified framework for describing many of the quantum algorithms discovered to date. We implement a noise-free simulation of the technique to investigate how it can be use...
Measurement-Free Fault-Tolerant Quantum Error Correction in Near-Term Devices
Sascha Heußen, David F. Locher, M. Muller·Jul 25, 2023
Logical qubits can be protected from decoherence by performing QEC cycles repeatedly. Algorithms for fault-tolerant QEC must be compiled to the specific hardware platform under consideration in order to practically realize a quantum memory that opera...