Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Importance sampling for stochastic quantum simulations
Oriel Kiss, M. Grossi, A. Roggero·Dec 12, 2022
Simulating many-body quantum systems is a promising task for quantum computers. However, the depth of most algorithms, such as product formulas, scales with the number of terms in the Hamiltonian, and can therefore be challenging to implement on near...
Two-qubit quantum photonic processor manufactured by femtosecond laser writing
N. Skryabin, I. Kondratyev, I. Dyakonov +3 more·Dec 12, 2022
We present an experimental implementation of a two-qubit photonic quantum processor fabricated using femtosecond laser writing technology. We employ femtosecond laser writing to create a low-loss reconfigurable photonic chip, implementing precise sin...
A SAT Approach to the Initial Mapping Problem in SWAP Gate Insertion for Commuting Gates
A. Matsuo, S. Yamashita, D. Egger·Dec 12, 2022
Most quantum circuits require SWAP gate insertion to run on quantum hardware with limited qubit connectivity. A promising SWAP gate insertion method for blocks of commuting two-qubit gates is a predetermined swap strategy which applies layers of SWAP...
On the quantum simulation of complex networks
Duarte Magano, João P. Moutinho, B. Coutinho·Dec 12, 2022
Quantum walks provide a natural framework to approach graph problems with quantum computers, exhibiting speedups over their classical counterparts for tasks such as the search for marked nodes or the prediction of missing links. Continuous-time quant...
Architectures for Multinode Superconducting Quantum Computers
James Ang, G. Carini, Yanzhu Chen +30 more·Dec 12, 2022
Many proposals to scale quantum technology rely on modular or distributed designs where individual quantum processors, called nodes, are linked together to form one large multinode quantum computer (MNQC). One scalable method to construct an MNQC is ...
NFNet: Non-interacting Fermion Network for Efficient Simulation of Large-scale Quantum Systems
Pengyuan Zhai, S. Yelin·Dec 12, 2022
We present NFNet, a PyTorch-based framework for polynomial-time simulation of large-scale, continuously controlled quantum systems, supporting parallel matrix computation and auto-differentiation of network parameters. It is based on the non-interact...
Parasitic-Free Gate: An Error-Protected Cross-Resonance Switch in Weakly Tunable Architectures
Xuexin Xu, M. Ansari·Dec 11, 2022
In two-qubit gates activated by microwave pulses, by turning pulse on or off, the state of qubits are swapped between entangled or idle modes. In either mode, the presence of stray couplings makes qubits accumulate coherent phase error. However, the ...
Gaussian breeding for encoding a qubit in propagating light
Kan Takase, Kosuke Fukui, Akito Kawasaki +5 more·Dec 11, 2022
Practical quantum computing requires robust encoding of logical qubits in physical systems to protect fragile quantum information. Currently, the lack of scalability limits the logical encoding in most physical systems, and thus the high scalability ...
Unbounded loops in quantum programs: categories and weak while loops
Pablo Andr'es-Mart'inez·Dec 10, 2022
Control flow of quantum programs is often divided into two different classes: classical and quantum. Quantum programs with classical control flow have their conditional branching determined by the classical outcome of measurements, and these collapse...
Applying NOX Error Mitigation Protocols to Calculate Real-time Quantum Field Theory Scattering Phase Shifts
Zachary P. Parks, Arnaud Carignan-Dugas, Erik J. Gustafson +2 more·Dec 10, 2022
Real-time scattering calculations on a Noisy Intermediate Scale Quantum (NISQ) quantum computer are disrupted by errors that accumulate throughout the circuits. To improve the accuracy of such physics simulations, one can supplement the application c...
Verifying Quantum Advantage Experiments with Multiple Amplitude Tensor Network Contraction.
Yong Liu, Yaojian Chen, Chu Guo +11 more·Dec 9, 2022
The quantum supremacy experiment, such as Google Sycamore [F. Arute et al., Nature (London) 574, 505 (2019).NATUAS0028-083610.1038/s41586-019-1666-5], poses a great challenge for classical verification due to the exponentially increasing compute cost...
Optimising graph codes for measurement-based loss tolerance
Thomas J. Bell, Love A. Pettersson, Stefano Paesani·Dec 9, 2022
Graph codes play an important role in photonic quantum technologies as they provide significant protection against qubit loss, a dominant noise mechanism. Here, we develop methods to analyse and optimise measurement-based tolerance to qubit loss and ...
Low-depth random Clifford circuits for quantum coding against Pauli noise using a tensor-network decoder
A. Darmawan, Y. Nakata, Shiro Tamiya +1 more·Dec 9, 2022
Recent work [M. J. Gullans et al., Physical Review X, 11(3):031066 (2021)] has shown that quantum error correcting codes defined by random Clifford encoding circuits can achieve a non-zero encoding rate in correcting errors even if the random circuit...
Graph test of controllability in qubit arrays: a systematic way to determine the minimum number of external controls
Fernando Gago-Encinas, M. Leibscher, C. Koch·Dec 9, 2022
The ability to implement any desired quantum logic gate on a quantum processing unit is equivalent to evolution-operator controllability of the qubits. Conversely, controllability analysis can be used to minimize the resources, i.e. the number of ext...
Quantum computing for fusion energy science applications
I. Joseph, Y. Shi, M. D. Porter +5 more·Dec 9, 2022
This is a review of recent research exploring and extending present-day quantum computing capabilities for fusion energy science applications. We begin with a brief tutorial on both ideal and open quantum dynamics, universal quantum computation, and ...
Overcoming exponential volume scaling in quantum simulations of lattice gauge theories
Christopher F. Kane, D. Grabowska, B. Nachman +1 more·Dec 9, 2022
Real-time evolution of quantum field theories using classical computers requires resources that scale exponentially with the number of lattice sites. Because of a fundamentally different computational strategy, quantum computers can in principle be u...
Loop-string-hadron formulation of an SU(3) gauge theory with dynamical quarks
Saurabh V. Kadam, Indrakshi Raychowdhury, Jesse R. Stryker·Dec 8, 2022
Towards the goal of quantum computing for lattice quantum chromodynamics, we present a loop-string-hadron (LSH) framework in 1+1 dimensions for describing the dynamics of SU(3) gauge fields coupled to staggered fermions. This novel framework was prev...
How to Sum and Exponentiate Hamiltonians in ZXW Calculus
R. A. Shaikh, Quanlong Wang, Richie Yeung·Dec 8, 2022
This paper develops practical summation techniques in ZXW calculus to reason about quantum dynamics, such as unitary time evolution. First we give a direct representation of a wide class of sums of linear operators, including arbitrary qubits Hamilto...
Strong Photon‐Magnon Coupling Using a Lithographically Defined Organic Ferrimagnet
Qin Xu, H. Cheung, D. S. Cormode +7 more·Dec 8, 2022
A cavity‐magnonic system composed of a superconducting microwave resonator coupled to a magnon mode hosted by the organic‐based ferrimagnet vanadium tetracyanoethylene (V[TCNE]x) is demonstrated. This work is motivated by the challenge of scalably in...
Twin-Field Quantum Key Distribution without Phase Locking.
Wei Li, Likang Zhang, Yichen Lu +11 more·Dec 8, 2022
Twin-field quantum key distribution (TF-QKD) has emerged as a promising solution for practical quantum communication over long-haul fiber. However, previous demonstrations on TF-QKD require the phase locking technique to coherently control the twin l...