Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Enhancing Virtual Distillation with Circuit Cutting for Quantum Error Mitigation
Peiyi Li, Ji Liu, Hrushikesh Pramod Patil +2 more·Oct 7, 2023
Virtual distillation is a technique that aims to mitigate errors in noisy quantum computers. It works by preparing multiple copies of a noisy quantum state, bridging them through a circuit, and conducting measurements. As the number of copies increas...
Many-Body-Expansion Based on Variational Quantum Eigensolver and Deflation for Dynamical Correlation.
Enhua Xu, Yuma Shimomoto, S. Ten-no +1 more·Oct 6, 2023
In this work, we utilize the framework of many-body expansion (MBE) to decompose electronic structures into fragments by incrementing virtual orbitals, aiming to accurately solve the ground and excited state energies of each fragment using the variat...
Problem-tailored Simulation of Energy Transport on Noisy Quantum Computers
I. Chen, Kl'ee Pollock, Yongxin Yao +2 more·Oct 5, 2023
The transport of conserved quantities like spin and charge is fundamental to characterizing the behavior of quantum many-body systems. Numerically simulating such dynamics is generically challenging, which motivates the consideration of quantum compu...
Phonon engineering of atomic-scale defects in superconducting quantum circuits
Mo Chen, John Clai Owens, Harald Putterman +2 more·Oct 5, 2023
Noise within solid-state systems at low temperatures can typically be traced back to material defects. In amorphous materials, these defects are broadly described by the tunneling two-level systems (TLSs) model. TLS have recently taken on further rel...
Quantum information processing with molecular nanomagnets: an introduction
Alessandro Chiesa, E. Macaluso, S. Carretta·Oct 2, 2023
ABSTRACT Many problems intractable on classical devices could be solved by algorithms explicitly based on quantum mechanical laws, i.e. exploiting quantum information processing. As a result, increasing efforts from different fields are nowadays dire...
Quantum Sensing with Erasure Qubits.
Pradeep Niroula, Jack Dolde, Xin Zheng +7 more·Oct 2, 2023
The dominant noise in an "erasure qubit" is an erasure-a type of error whose occurrence and location can be detected. Erasure qubits have potential to reduce the overhead associated with fault tolerance. To date, research on erasure qubits has primar...
Nearest neighbor synthesis of CNOT circuits on general quantum architectures
Xinyu Chen, Min Zhu, Xueyun Cheng +2 more·Oct 1, 2023
NISQ devices have inherent limitations in terms of connectivity and hardware noise. The synthesis of CNOT circuits considers the physical constraints and transforms quantum algorithms into low-level quantum circuits that can execute on physical chips...
Charge-parity switching effects and optimisation of transmon-qubit design parameters
Miha Papič, J. Tuorila, Adrian Auer +2 more·Sep 29, 2023
Enhancing the performance of noisy quantum processors requires improving our understanding of error mechanisms and the ways to overcome them. A judicious selection of qubit design parameters plays a pivotal role in improving the performance of quantu...
Group twirling and noise tailoring for multiqubit controlled phase gates
Guoding Liu, Ziyi Xie, Zitai Xu +1 more·Sep 27, 2023
Group twirling is crucial in quantum information processing, particularly in randomized benchmarking and randomized compiling. While protocols based on Pauli twirling have been effectively crafted to transform arbitrary noise channels into Pauli chan...
Quantum computer-enabled receivers for optical communication
J.C. Crossman, Spencer Dimitroff, Lukasz Cincio +1 more·Sep 27, 2023
Optical communication is the standard for high-bandwidth information transfer in today’s digital age. The increasing demand for bandwidth has led to the maturation of coherent transceivers that use phase- and amplitude-modulated optical signals to en...
SuperGaN: Synthesis of NbTiN/GaN/NbTiN Tunnel Junctions
M. Cyberey, S. Hinton, Christopher M. Moore +2 more·Sep 26, 2023
Nb-based circuits have broad applications in quantum-limited photon detectors, low-noise parametric amplifiers, superconducting digital logic circuits, and low-loss circuits for quantum computing. The current state-of-the-art approach for superconduc...
Resource-efficient generalized quantum subspace expansion
Bo-Jhang Yang, N. Yoshioka, H. Harada +5 more·Sep 25, 2023
Realizing practical quantum computing requires overcoming a number of computation errors and the limitation of device size, which have intensively been tackled by quantum error mitigation (QEM) these days. As a unified approach of noise-agnostic QEM,...
Dynamical subset sampling of quantum error-correcting protocols
Sascha Heußen, Don Winter, M. Rispler +1 more·Sep 22, 2023
Quantum error correcting (QEC) stabilizer codes enable protection of quantum information against errors during storage and processing. Simulation of noisy QEC codes is used to identify the noise parameters necessary for advantageous operation of logi...
Compatibility of Generalized Noisy Qubit Measurements
Martin J. Renner·Sep 21, 2023
It is a crucial feature of quantum mechanics that not all measurements are compatible with each other. However, if measurements suffer from noise they may lose their incompatibility. Here, we consider the effect of white noise and determine the criti...
Silicon spin qubit noise characterization using real-time feedback protocols and wavelet analysis
N. Dumoulin Stuyck, A. Seedhouse, S. Serrano +10 more·Sep 21, 2023
Recently, several groups have demonstrated two-qubit gate fidelities in semiconductor spin qubit systems above 99%. Achieving this regime of fault-tolerant compatible high fidelities is nontrivial and requires exquisite stability and precise control ...
Wavelet correlation noise analysis for qubit operation variable time series
A. Seedhouse, N. D. Stuyck, S. Serrano +10 more·Sep 21, 2023
In quantum computing, characterizing the full noise profile of qubits can aid in increasing coherence times and fidelities by developing error-mitigating techniques specific to the noise present. This characterization also supports efforts in advanci...
A Robust Large-Period Discrete Time Crystal and its Signature in a Digital Quantum Computer
Tianqi Chen, Ruizhe Shen, Ching Hua Lee +2 more·Sep 20, 2023
Discrete time crystals (DTCs) are novel out-of-equilibrium quantum states of matter which break time translational symmetry. DTCs have been extensively realized in experiments, particularly their subclass that is characterized by period-doubling dyna...
Hardness results for decoding the surface code with Pauli noise
Alex Fischer, Akimasa Miyake·Sep 19, 2023
Real quantum computers will be subject to complicated, qubit-dependent noise, instead of simple noise such as depolarizing noise with the same strength for all qubits. We can do quantum error correction more effectively if our decoding algorithms tak...
Fault-tolerant hyperbolic Floquet quantum error correcting codes
Ali Fahimniya, Hossein Dehghani, Kishor Bharti +4 more·Sep 18, 2023
A central goal in quantum error correction is to reduce the overhead of fault-tolerant quantum computing by increasing noise thresholds and reducing the number of physical qubits required to sustain a logical qubit. We introduce a potential path towa...
Correcting on-chip distortion of control pulses with silicon spin qubits
Ming 铭 Ni 倪, R. Ma 马, Zhen-Zhen 真真 Kong 孔 +10 more·Sep 18, 2023
In semiconductor quantum dot systems, pulse distortion is a significant source of coherent errors, which impedes qubit characterization and control. Here, we demonstrate two calibration methods using a two-qubit system as the detector to correct dist...