Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
BEINIT: Avoiding Barren Plateaus in Variational Quantum Algorithms
Ankit Kulshrestha, Ilya Safro·Apr 28, 2022
Barren plateaus are a notorious problem in the optimization of variational quantum algorithms and pose a critical obstacle in the quest for more efficient quantum machine learning algorithms. Many potential reasons for barren plateaus have been ident...
Accelerating Noisy VQE Optimization with Gaussian Processes
Juliane Mueller, W. Lavrijsen, Costin Iancu +1 more·Apr 15, 2022
Hybrid variational quantum algorithms, which combine a classical optimizer with evaluations on a quantum chip, are the most promising candidates to show quantum advantage on current noisy, intermediate-scale quantum (NISQ) devices. The classical opti...
Demonstration of a Quantum Gate Using Electromagnetically Induced Transparency.
K. McDonnell, L. Keary, J. Pritchard·Apr 7, 2022
We demonstrate a native CNOT gate between two individually addressed neutral atoms based on electromagnetically induced transparency. This protocol utilizes the strong long-range interactions of Rydberg states to enable conditional state transfer on ...
Effective qubit dephasing induced by spectator-qubit relaxation
P. Jurcevic, L. Govia·Apr 6, 2022
In many leading architectures for quantum computing, it remains to be understood if we can equate single-qubit coherence times measured in isolation, to that of coherence times measured in multi-qubit devices. On a multi-qubit superconducting circuit...
Randomized Benchmarking beyond Groups
Jianxin Chen, D. Ding, Cupjin Huang·Mar 23, 2022
Randomized benchmarking (RB) is the gold standard for experimentally evaluating the quality of quantum operations. The current framework for RB is centered on groups and their representations, but this can be problematic. For example, Clifford circui...
Recursive Variational Quantum Compiling
S. Bilek, Kristian Wold·Mar 16, 2022
Variational quantum compiling (VQC) algorithms aim to approximate deep quantum circuits with shallow parameterized ansatzes, making them more suitable for NISQ hardware. In this article a variant of VQC named the recursive variational quantum compili...
Combating fluctuations in relaxation times of fixed-frequency transmon qubits with microwave-dressed states
Peng Zhao, Teng Ma, Yirong Jin +1 more·Mar 15, 2022
With the long coherence time, the fixed-frequency transmon qubit is a promising qubit modality for quantum computing. Currently, diverse qubit architectures that utilize fixed-frequency transmon qubits have been demonstrated with high-fidelity gate p...
QuFI: a Quantum Fault Injector to Measure the Reliability of Qubits and Quantum Circuits
Daniel Oliveira, Edoardo Giusto, Emanuele Dri +5 more·Mar 14, 2022
Quantum computing is an up-and-coming technology that is expected to revolutionize the computation paradigm in the next few years. Qubits, the primary computing elements of quantum circuits, exploit the quantum physics proprieties to increase the par...
Measurement-induced entanglement phase transition on a superconducting quantum processor with mid-circuit readout
Jin Ming Koh, Shi-Ning Sun, M. Motta +1 more·Mar 8, 2022
Quantum many-body systems subjected to unitary evolution with the addition of interspersed measurements exhibit a variety of dynamical phases that do not occur under pure unitary evolution. However, these systems remain challenging to investigate on ...
Signature Correction Attack on Dilithium Signature Scheme
Saad Islam, K. Mus, Richa Singh +2 more·Mar 1, 2022
Motivated by the rise of quantum computers, existing public-key cryptosystems are expected to be replaced by post-quantum schemes in the next decade in billions of devices. To facilitate the transition, NIST is running a standardization process which...
Observation of Wave-Packet Branching through an Engineered Conical Intersection
Christopher S. Wang, N. Frattini, Benjamin J. Chapman +4 more·Feb 4, 2022
In chemical reactions, the interplay between coherent evolution and dissipation is central to determining key properties such as the rate and yield. Of particular interest are cases where two potential energy surfaces cross at features known as conic...
Spectral broadening of a single Er$^{3+}$ ion in a Si nano-transistor
Jiliang Yang, Jian Wang, Wenda Fan +9 more·Jan 27, 2022
Single rare-earth ions in solids show great potential for quantum applications, including single photon emission, quantum computing, and high-precision sensing. However, homogeneous linewidths observed for single rare-earth ions are orders of magnitu...
Quantum Expectation Transformers for Cost Analysis
Martin Avanzini, G. Moser, Romain Péchoux +2 more·Jan 23, 2022
We introduce a new kind of expectation transformer for a mixed classical-quantum programming language. Our semantic approach relies on a new notion of a cost structure, which we introduce and which can be seen as a specialisation of the Kegelspitzen ...
Error-robust quantum signal processing using Rydberg atoms
Sina Zeytinouglu, S. Sugiura·Jan 12, 2022
Rydberg atom arrays have recently emerged as one of the most promising platforms for quantum simulation and quantum information processing. However, as is the case for other experimental platforms, the longer-term success of the Rydberg atom arrays i...
Numerical simulations of noisy quantum circuits for computational chemistry
Jerimiah Wright, Meenambika Gowrishankar, Daniel Claudino +4 more·Dec 31, 2021
The opportunities afforded by near-term quantum computers to calculate the ground-state properties of small molecules depend on the structure of the computational ansatz as well as the errors induced by device noise. Here we investigate the behavior ...
Quantum simulation in the semi-classical regime
Shi Jin, Xiantao Li, Nana Liu·Dec 25, 2021
<jats:p>Solving the time-dependent Schrödinger equation is an important application area for quantum algorithms. We consider Schrödinger's equation in the semi-classical regime. Here the solutions exhibit strong multiple-scale behavior due to a small...
Phase Diffusion in Low-EJ Josephson Junctions at Milli-Kelvin Temperatures
Wen-Sen Lu, K. Kalashnikov, Plamen Kamenov +2 more·Dec 20, 2021
Josephson junctions (JJs) with Josephson energy EJ≲1 K are widely employed as non-linear elements in superconducting circuits for quantum computing operating at milli-Kelvin temperatures. In the qubits with small charging energy EC ( EJ/EC≫1 ), such ...
Numerical evaluation and robustness of the quantum mean-force Gibbs state
Yiu-Fung Chiu, A. Strathearn, Jonathan Keeling·Dec 15, 2021
We introduce a numerical method to determine the Hamiltonian of Mean Force (HMF) Gibbs state for a quantum system strongly coupled to a reservoir. The method adapts the Time Evolving Matrix Product Operator (TEMPO) algorithm to imaginary time propaga...
SPDCinv: Inverse Quantum-Optical Design of High-Dimensional Qudits
Eyal Rozenberg, Aviv Karnieli, O. Yesharim +5 more·Dec 11, 2021
Spontaneous parametric down-conversion in quantum optics is an invaluable resource for the realization of high-dimensional qudits with spatial modes of light. One of the main open challenges is how to directly generate a desirable qudit state in the ...
Tensor network approach to the two-dimensional fully frustrated XY model and a chiral ordered phase
Fengmin Song, Guang-Ming Zhang·Dec 7, 2021
A general framework is proposed to solve the two-dimensional fully frustrated XY model for the Josephson junction arrays in a perpendicular magnetic field. The essential idea is to encode the ground-state local rules induced by frustrations in the loc...