Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
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...
Enhanced quantum state preparation via stochastic predictions of neural networks
C. Li, Runhong He, Zhao-Ming Wang·Jul 27, 2023
In pursuit of enhancing the predication capabilities of the neural network, it has been a longstanding objective to create dataset encompassing a diverse array of samples. The purpose is to broaden the horizons of neural network and continually striv...
Dissipation-enabled bosonic Hamiltonian learning via new information-propagation bounds
Tim Mobus, Andreas Bluhm, Matthias C. Caro +2 more·Jul 27, 2023
Reliable quantum technology requires knowledge of the dynamics governing the underlying system. This problem of characterizing and benchmarking quantum devices or experiments in continuous time is referred to as the Hamiltonian learning problem. In c...
Photonic counterdiabatic quantum optimization algorithm
P. Chandarana, Koushik Paul, Mikel Garcia-de-Andoin +3 more·Jul 27, 2023
One of the key applications of near-term quantum computers has been the development of quantum optimization algorithms. However, these algorithms have largely been focused on qubit-based technologies. Here, we propose a hybrid quantum-classical appro...
Decoding algorithms for surface codes
Antonio deMarti iOlius, Patricio Fuentes, Rom'an Or'us +2 more·Jul 27, 2023
Quantum technologies have the potential to solve certain computationally hard problems with polynomial or super-polynomial speedups when compared to classical methods. Unfortunately, the unstable nature of quantum information makes it prone to errors...
Factory-based fault-tolerant preparation of quantum polar codes encoding one logical qubit
Ashutosh Goswami, M. Mhalla, Valentin Savin·Jul 27, 2023
A fault-tolerant way to prepare logical code-states of Q1 codes, i.e., quantum polar codes encoding one qubit, has been recently proposed. The fault tolerance therein is guaranteed by an error detection gadget, where if an error is detected during th...
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...
Two-step feedback preparation of entanglement for qubit systems with time delay
Yanan Liu, Daoyi Dong, S. Kuang +2 more·Jul 27, 2023
Quantum entanglement plays a fundamental role in quantum computation and quantum communication. Feedback control has been widely used in stochastic quantum systems to generate given entangled states since it has good robustness, where the time requir...
Decoherence of a tunable capacitively shunted flux qubit
R. Trappen, X. Dai, M. A. Yurtalan +19 more·Jul 26, 2023
Quantum annealing is a method to solve optimization problems that leverages quantum tunneling in a coupled qubit system. We present a detailed study of the coherence of a tunable capacitively-shunted flux qubit, designed for coherent quantum annealin...
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...
QPLEX: Realizing the Integration of Quantum Computing into Combinatorial Optimization Software
J. Giraldo, José Ossorio, Norha M. Villegas +2 more·Jul 26, 2023
Quantum computing has the potential to surpass the capabilities of current classical computers when solving complex problems. Combinatorial optimization has emerged as one of the key target areas for quantum computers as problems found in this field ...
Reconstructing thermal quantum quench dynamics from pure states
Jason Saroni, Henry Lamm, P. Orth +1 more·Jul 26, 2023
Simulating the nonequilibrium dynamics of thermal states is a fundamental problem across scales from high energy to condensed matter physics. Quantum computers may provide a way to solve this problem efficiently. Preparing a thermal state on a quantu...
Multiparameter Estimation with Two-Qubit Probes in Noisy Channels
Lorcán O. Conlon, P. Lam, S. Assad·Jul 26, 2023
This work compares the performance of single- and two-qubit probes for estimating several phase rotations simultaneously under the action of different noisy channels. We compute the quantum limits for this simultaneous estimation using collective and...
Verifiable measurement-based quantum random sampling with trapped ions
M. Ringbauer, M. Hinsche, T. Feldker +13 more·Jul 26, 2023
Quantum computers are now on the brink of outperforming their classical counterparts. One way to demonstrate the advantage of quantum computation is through quantum random sampling performed on quantum computing devices. However, existing tools for v...
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...
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 ...
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...
Energy preserving evolutions over Bosonic systems
Paul Gondolf, Tim Möbus, C. Rouzé·Jul 25, 2023
The exponential convergence to invariant subspaces of quantum Markov semigroups plays a crucial role in quantum information theory. One such example is in bosonic error correction schemes, where dissipation is used to drive states back to the code-sp...