Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Microscopic parametrizations for gate set tomography under coloured noise
P. Vinas, A. Bermudez·Jul 16, 2024
Gate set tomography (GST) allows for a self-consistent characterization of noisy quantum information processors (QIPs). The standard approach treats QIPs as black boxes only constrained by the laws of physics, attaining full generality at a considera...
Dissipationless topological quantum computation for Majorana objects in the sparse-dense mixed encoding process
Ye-Min Zhan, Guan-Dong Mao, Yu-Ge Chen +2 more·Jul 16, 2024
Topological quantum computation based on Majorana objects is subject to a significant challenge because at least some of the two-qubit quantum gates rely on the fermion (either charge or spin) parity of the qubits. This dependency renders the quantum...
Quantum and Classical Dynamics with Random Permutation Circuits
B. Bertini, Katja Klobas, Pavel Kos +1 more·Jul 16, 2024
Understanding thermalization in quantum many-body systems is among the most enduring problems in modern physics. A particularly interesting question concerns the role played by quantum mechanics in this process, i.e., whether thermalization in quantu...
Approximate inverse measurement channel for shallow shadows
Riccardo Cioli, Elisa Ercolessi, Matteo Ippoliti +2 more·Jul 16, 2024
Classical shadows are a versatile tool to probe many-body quantum systems, consisting of a combination of randomised measurements and classical post-processing computations. In a recently introduced version of the protocol, the randomization step is ...
A cryogenic on-chip microwave pulse generator for large-scale superconducting quantum computing
Zenghui Bao, Yan Li, Zhiling Wang +7 more·Jul 16, 2024
For superconducting quantum processors, microwave signals are delivered to each qubit from room-temperature electronics to the cryogenic environment through coaxial cables. Limited by the heat load of cabling and the massive cost of electronics, such...
Far from Perfect: Quantum Error Correction with (Hyperinvariant) Evenbly Codes
M. Steinberg, Junyu Fan, Robert J. Harris +3 more·Jul 16, 2024
We introduce a new class of qubit codes that we call Evenbly codes, building on a previous proposal of hyperinvariant tensor networks. Its tensor network description consists of local, non-perfect tensors describing CSS codes interspersed with Hadama...
Pseudorandom density matrices
Nikhil Bansal, Wai-Keong Mok, Kishor Bharti +2 more·Jul 16, 2024
Pseudorandom states (PRSs) are state ensembles that cannot be efficiently distinguished from Haar-random states. However, the definition of PRSs has been limited to pure states and lacks robustness against noise. In this work, we introduce pseudorand...
Quantum annealer accelerates the variational quantum eigensolver in a triple-hybrid algorithm
M. Jattana·Jul 16, 2024
Hybrid algorithms that combine quantum and classical resources have become commonplace in quantum computing. The variational quantum eigensolver (VQE) is routinely used to solve prototype problems. Currently, hybrid algorithms use no more than one ki...
Minimally Entangled Typical Thermal States for Classical and Quantum Simulation of 1+1-Dimensional $\mathbb Z_2$ Lattice Gauge Theory at Finite Temperature and Density
I. Chen, João C. Getelina, Kl'ee Pollock +4 more·Jul 16, 2024
Simulating strongly coupled gauge theories at finite temperature and density is a longstanding challenge in nuclear and high-energy physics that also has fundamental implications for condensed matter physics. In this work, we use minimally entangled ...
Benchmarking Quantum Computers: Towards a Standard Performance Evaluation Approach
Arturo Acuaviva, David Aguirre, Rubén Peña +1 more·Jul 15, 2024
The technological development of increasingly larger quantum processors on different quantum platforms raises the problem of how to fairly compare their performance, known as quantum benchmarking of quantum processors. This is a challenge that comput...
The geometry of the Hermitian matrix space and the Schrieffer--Wolff transformation
Gergő Pintér, György Frank, Dániel Varjas +1 more·Jul 15, 2024
In quantum mechanics, the Schrieffer--Wolff (SW) transformation (also called quasi-degenerate perturbation theory) is known as an approximative method to reduce the dimension of the Hamiltonian. We present a geometric interpretation of the SW transfo...
Encoded probabilistic imaginary-time evolution on a trapped-ion quantum computer for ground and excited states of spin qubits
Hirofumi Nishi, Yuki Takei, Taichi Kosugi +4 more·Jul 15, 2024
In this study, we employed a quantum computer to solve a low-energy effective Hamiltonian for spin defects in diamond (so-called NV centre) and wurtzite-type aluminium nitride, which are anticipated to be qubits. The probabilistic imaginary-time evol...
On the Efficacy of Surface Codes in Compensating for Radiation Events in Superconducting Devices
Marzio Vallero, Gioele Casagranda, Flavio Vella +1 more·Jul 15, 2024
Reliability is fundamental for developing large-scale quantum computers. Since the benefit of technological advancements to the qubit’s stability is saturating, algorithmic solutions, such as quantum error correction (QEC) codes, are needed to bridge...
Benchmarking the Readout of a Superconducting Qubit for Repeated Measurements.
S. Hazra, W. Dai, T. Connolly +4 more·Jul 15, 2024
Readout of superconducting qubits faces a trade-off between measurement speed and unwanted backaction on the qubit caused by the readout drive, such as T_{1} degradation and leakage out of the computational subspace. The readout is typically benchmar...
Variational quantum imaginary time evolution for matrix product state Ansatz with tests on transcorrelated Hamiltonians.
Hao-En Li, Xiang Li, Jiachen Huang +5 more·Jul 15, 2024
The matrix product state (MPS) Ansatz offers a promising approach for finding the ground state of molecular Hamiltonians and solving quantum chemistry problems. Building on this concept, the proposed technique of quantum circuit MPS (QCMPS) enables t...
OnionVQE optimization strategy for ground state preparation on NISQ devices
Katerina Gratsea, Johannes Selisko, Maximilian Amsler +3 more·Jul 15, 2024
The variational quantum eigensolver (VQE) is one of the most promising and widely used algorithms for exploiting the capabilities of current Noisy Intermediate-Scale Quantum (NISQ) devices. However, VQE algorithms suffer from a plethora of issues, su...
A general and modular approach to solid-state integration and readout of zero-dimensional quantum systems
M. Kavand, Zoe Phillips, William Koll +13 more·Jul 15, 2024
Here, we present an all-electrical readout mechanism for quasi-0D quantum states (0D-QS) such as point defects, adatoms and molecules, that is modular and general, providing an approach that is amenable to scaling and integration with other solid-sta...
Quantum data centres: a simulation-based comparative noise analysis
K. Campbell, M. Razavi, Ahmed Lawey·Jul 15, 2024
Quantum data centres (QDCs) could overcome the scalability challenges of modern quantum computers. Single-processor monolithic quantum computers are affected by increased cross talk and difficulty of implementing gates when the number of qubits is in...
Hybrid Oscillator-Qubit Quantum Processors: Instruction Set Architectures, Abstract Machine Models, and Applications
Yuan Liu, Shraddha Singh, Kevin C. Smith +11 more·Jul 15, 2024
Quantum computing with discrete variable (DV, qubit) hardware is approaching the large scales necessary for computations beyond the reach of classical computers. However, important use cases such as quantum simulations of physical models containing b...
Quantum control of an oscillator with a Kerr-cat qubit
Andy Z Ding, Benjamin L. Brock, A. Eickbusch +10 more·Jul 15, 2024
Bosonic codes offer a hardware-efficient strategy for quantum error correction by redundantly encoding quantum information in the large Hilbert space of a harmonic oscillator. However, experimental realizations of these codes are often limited by anc...