Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Unitary property testing lower bounds by polynomials
Adrian She, H. Yuen·Oct 12, 2022
We study unitary property testing, where a quantum algorithm is given query access to a black-box unitary and has to decide whether it satisfies some property. In addition to containing the standard quantum query complexity model (where the unitary e...
‘Quantum supremacy’ revisited: low-complexity, deterministic solutions of the original Deutsch–Jozsa problem in classical physical systems
L. Kish·Oct 11, 2022
The original Deutsch–Jozsa (oDJ) problem is for an oracle (realized here as a database) of size N, where, according to their claim, the deterministic solution of the problem on a classical Turing computer requires O(N) computational complexity. They ...
QuCNN: A Quantum Convolutional Neural Network with Entanglement Based Backpropagation
S. Stein, Y. Mao, James Ang +1 more·Oct 11, 2022
Quantum Machine Learning continues to be a highly active area of interest within Quantum Computing. Many of these approaches have adapted classical approaches to the quantum settings, such as QuantumFlow, etc. We push forward this trend, and demonstr...
A Probabilistic Imaginary Time Evolution Algorithm Based on Non-unitary Quantum Circuit
Haoshan Xie, Shijie Wei, F. Yang +4 more·Oct 11, 2022
Imaginary time evolution is a powerful tool applied in quantum physics, while existing classical algorithms for simulating imaginary time evolution suffer high computational complexity as the quantum systems become larger and more complex. In this wo...
Real-time frequency estimation of a qubit without single-shot-readout
Inbar Zohar, B. Haylock, Y. Romach +8 more·Oct 11, 2022
Quantum sensors can potentially achieve the Heisenberg limit of sensitivity over a large dynamic range using quantum algorithms. The adaptive phase estimation algorithm (PEA) is one example that was proven to achieve such high sensitivities with sing...
Perturbative boundaries of quantum computing: real-time evolution for digitized lambda phi^4 lattice models
Robert Maxton, Y. Meurice·Oct 11, 2022
The real time evolution of quantum field theory models can be calculated order by order in perturbation theory. For $\lambda \phi^4$ models, the perturbative series have a zero radius of convergence which in part motivated the design of digitized ver...
Quantum walks on random lattices: Diffusion, localization, and the absence of parametric quantum speedup
Rostislav Duda, Moein N. Ivaki, I. Sahlberg +2 more·Oct 11, 2022
Discrete-time quantum walks, quantum generalizations of classical random walks, provide a framework for quantum information processing, quantum algorithms and quantum simulation of condensed matter systems. The key property of quantum walks, which li...
Size optimization of CNOT circuits on NISQ
Anpeng Zhang, Xiutao Feng, S. Xu·Oct 11, 2022
Quantum computers in practice today require strict memory constraints, where 2-qubit operations can only be performed between the qubits closest to each other in a graph structure. So a quantum circuit must undergo a transformation to the graph befor...
Exploring the neighborhood of 1-layer QAOA with instantaneous quantum polynomial circuits
S. Leontica, D. Amaro·Oct 11, 2022
We embed 1-layer QAOA circuits into the larger class of parameterized Instantaneous Quantum Polynomial circuits to produce an improved variational quantum algorithm for solving combinatorial optimization problems. The use of analytic expressions to f...
CNOT-Efficient Circuits for Arbitrary Rank Many-Body Fermionic and Qubit Excitations.
I. Magoulas, Francesco A. Evangelista·Oct 11, 2022
Efficient quantum circuits are necessary for realizing quantum algorithms on noisy intermediate-scale quantum devices. Fermionic excitations entering unitary coupled-cluster (UCC) ansätze give rise to quantum circuits containing CNOT "staircases" who...
Evolving quantum circuits
Daniel Tandeitnik, T. Guerreiro·Oct 11, 2022
We develop genetic algorithms for searching quantum circuits, in particular stabilizer quantum error correction codes. Quantum codes equivalent to notable examples such as the 5-qubit perfect code, Shor’s code and the 7-qubit color code are evolved o...
Two-Level-System Dynamics in a Superconducting Qubit Due to Background Ionizing Radiation
T. Thorbeck, A. Eddins, I. Lauer +2 more·Oct 10, 2022
Superconducting qubit lifetimes must be both long and stable to provide an adequate foundation for quantum computing. This stability is imperiled by two-level systems (TLSs), currently a dominant loss mechanism, which exhibit slow spectral dynamics t...
Quantum-classical tradeoffs and multi-controlled quantum gate decompositions in variational algorithms
T. Tomesh, Nicholas Allen, Zain Saleem·Oct 10, 2022
The computational capabilities of near-term quantum computers are limited by the noisy execution of gate operations and a limited number of physical qubits. Hybrid variational algorithms are well-suited to near-term quantum devices because they allow...
Superresolution of Green's functions on noisy quantum computers
Diogo Cruz, Duarte Magano·Oct 10, 2022
Quantum computers, using efficient Hamiltonian evolution routines, have the potential to simulate Green's functions of classically-intractable quantum systems. However, the decoherence errors of near-term quantum processors prohibit large evolution t...
Potential Applications of Quantum Computing for the Insurance Industry
M. Adam·Oct 10, 2022
This paper is the documentation of a pre-study performed by AXA Konzern AG in collaboration with Fraunhofer ITWM to assess the relevance of quantum computing for the insurance industry. Beside a general overview of the status quo of quantum computing...
Superconducting transmon qubit-resonator quantum battery
Fu-Quan Dou, Fang Yang·Oct 10, 2022
Quantum battery (QB) is the miniature energy storage and release device and plays a crucial role in future quantum technology. Here, an implementation scheme of a QB is proposed on a superconducting circuit which is composed by $N$ coupled transmon q...
Intermodulation Distortion in a Josephson Traveling-Wave Parametric Amplifier
A. Remm, S. Krinner, N. Lacroix +5 more·Oct 10, 2022
Josephson traveling wave parametric amplifiers enable the amplification of weak microwave signals close to the quantum limit with large bandwidth, which has a broad range of applications in superconducting quantum computing and in the operation of si...
Speeding Up Entanglement Generation by Proximity to Higher-Order Exceptional Points.
Zeng-Zhao Li, Weijian Chen, M. Abbasi +2 more·Oct 10, 2022
Entanglement is a key resource for quantum information technologies ranging from quantum sensing to quantum computing. Conventionally, the entanglement between two coupled qubits is established at the timescale of the inverse of the coupling strength...
Quantifying quantum causal influences
Lucas Hutter, R. Chaves, R. Nery +2 more·Oct 9, 2022
Causal influences are at the core of any empirical science, the reason why its quantification is of paramount relevance for the mathematical theory of causality and applications. Quantum correlations, however, challenge our notion of cause and effect...
Benchmarking multi-qubit gates -- I: Metrological aspects
Bharath Hebbe Madhusudhana·Oct 9, 2022
Accurate and precise control of large quantum systems is paramount to achieve practical advantages on quantum devices. Therefore, benchmarking the hardware errors in quantum computers has drawn significant attention lately. Existing benchmarks for di...