Papers
Live trends in quantum computing research, updated daily from arXiv.
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13,354 papers in 12 months (+7% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Decoding of Quantum Data-Syndrome Codes via Belief Propagation
Kao-Yueh Kuo, Ethan Chern, C. Lai·Feb 3, 2021
Quantum error correction is necessary to protect logical quantum states and operations. However, no meaningful data protection can be made when the syndrome extraction is erroneous due to faulty measurement gates. Quantum data-syndrome (DS) codes are...
Capacity and quantum geometry of parametrized quantum circuits
T. Haug, Kishor Bharti, M. Kim·Feb 2, 2021
To harness the potential of noisy intermediate-scale quantum devices, it is paramount to find the best type of circuits to run hybrid quantum-classical algorithms. Key candidates are parametrized quantum circuits that can be effectively implemented o...
Ansatz-Independent Variational Quantum Classifiers and the Price of Ansatz
Hideyuki Miyahara, V. Roychowdhury·Feb 2, 2021
The paradigm of variational quantum classifiers (VQCs) encodes classical information as quantum states, followed by quantum processing and then measurements to generate classical predictions. VQCs are promising candidates for efficient utilizations o...
Special-Purpose Quantum Processor Design
Bing-Han Lu, Yuchun Wu, Wei-cheng Kong +2 more·Feb 1, 2021
Full connectivity of qubits is necessary for most quantum algorithms, which is difficult to directly implement on Noisy Intermediate-Scale Quantum processors. However, inserting swap gate to enable the two-qubit gates between uncoupled qubits signifi...
Qubits made by advanced semiconductor manufacturing
A. Zwerver, T. Krahenmann, T. Watson +26 more·Jan 29, 2021
Silicon spin qubits can be fabricated in a 300 mm semiconductor manufacturing facility using all-optical lithography and fully industrial processing. Full-scale quantum computers require the integration of millions of qubits, and the potential of usi...
Fast Estimation of Outcome Probabilities for Quantum Circuits
Hakop Pashayan, Oliver Reardon-Smith, K. Korzekwa +1 more·Jan 28, 2021
We present two classical algorithms for the simulation of universal quantum circuits on $n$ qubits constructed from $c$ instances of Clifford gates and $t$ arbitrary-angle $Z$-rotation gates such as $T$ gates. Our algorithms complement each other by ...
Quasiprobability decompositions with reduced sampling overhead
C. Piveteau, David Sutter, Stefan Woerner·Jan 22, 2021
Quantum error-mitigation techniques can reduce noise on current quantum hardware without the need for fault-tolerant quantum error correction. For instance, the quasiprobability method simulates a noise-free quantum computer using a noisy one, with t...
Fusion-based quantum computation
Sara Bartolucci, P. Birchall, H. Bombin +10 more·Jan 22, 2021
Fusion gates are common operations in photonic quantum information platforms, where they are employed to create entanglement. Here, the authors propose a quantum computation scheme where the same measurements used to generate entanglement can also be...
Hoare meets Heisenberg: A Lightweight Logic for Quantum Programs
Aarthi Sundaram, Robert Rand, Kartik Singhal +1 more·Jan 22, 2021
We show that Gottesman's (1998) semantics for Clifford circuits based on the Heisenberg representation gives rise to a lightweight Hoare-like logic for efficiently characterizing a common subset of quantum programs. Our applications include (i) certi...
Deterministic photonic quantum computation in a synthetic time dimension
Ben Bartlett, A. Dutt, S. Fan·Jan 19, 2021
Photonics offers unique advantages as a substrate for quantum information processing, but im-poses fundamental scalability challenges. Nondeterministic schemes impose massive resource overheads, while deterministic schemes require prohibitively many i...
Tunable Coupling Architecture for Fixed-Frequency Transmon Superconducting Qubits.
J. Stehlík, D. M. Zajac, D. Underwood +9 more·Jan 19, 2021
Implementation of high-fidelity 2-qubit operations is a key ingredient for scalable quantum error correction. In superconducting qubit architectures, tunable buses have been explored as a means to higher-fidelity gates. However, these buses introduce...
Experimental realization of nonadiabatic holonomic single‐qubit quantum gates with two dark paths in a trapped ion
Ming-Zhong Ai, Sai Li, Ran He +5 more·Jan 19, 2021
For circuit-based quantum computation, experimental implementation of a universal set of quantum logic gates with high-fidelity and strong robustness is essential and central. Quantum gates induced by geometric phases, which depend only on global pro...
Efficient, stabilized two-qubit gates on a trapped-ion quantum computer
R. Blümel, Nikodem Grzesiak, N. Nguyen +5 more·Jan 19, 2021
In order to scale up quantum processors and achieve a quantum advantage, it is crucial to economize on the power requirement of two-qubit gates, make them robust to drift in experimental parameters, and shorten the gate times. Applicable to all quant...
Efficient Quantum Circuit Synthesis for SAT-Oracle With Limited Ancillary Qubit
Shuai Yang, Wei Zi, Bujiao Wu +3 more·Jan 14, 2021
One of the main concerns in the era of noisy intermediate-scale quantum (NISQ) computing and fault-tolerant quantum computing is the optimization of circuit implementation for quantum oracles, particularly with limited resources. Synthesizing a satis...
Quantum Computing with Superconducting Circuits in the Picosecond Regime
Daoquan Zhu, T. Jaako, Qiongyi He +1 more·Jan 14, 2021
We discuss the realization of a universal set of ultrafast single- and two-qubit operations with superconducting quantum circuits and investigate the most relevant physical and technical limitations that arise when pushing for faster and faster gates...
Fastest Local Entanglement Scrambler, Multistage Thermalization, and a Non-Hermitian Phantom
J. Bensa, M. Znidaric·Jan 14, 2021
We study random quantum circuits and their rate of producing bipartite entanglement, specifically with respect to the choice of 2-qubit gates and the order (protocol) in which these are applied. The problem is mapped to a Markovian process and proved...
Stochastic search for approximate compilation of unitaries
Ryan E Shaffer·Jan 12, 2021
Compilation of unitaries into a sequence of physical quantum gates is a critical prerequisite for execution of quantum algorithms. This work introduces STOQ, a stochastic search protocol for approximate unitary compilation into a sequence of gates fr...
Efficient decomposition of unitary matrices in quantum circuit compilers
A. Krol, A. Sarkar, I. Ashraf +2 more·Jan 8, 2021
Unitary decomposition is a widely used method to map quantum algorithms to an arbitrary set of quantum gates. Efficient implementation of this decomposition allows for the translation of bigger unitary gates into elementary quantum operations, which ...
Fault-Tolerant Continuous-Variable Measurement-based Quantum Computation Architecture
M. V. Larsen, C. Chamberland, Kyungjoo Noh +2 more·Jan 8, 2021
Continuous variable measurement-based quantum computation on cluster states has in recent years shown great potential for scalable, universal, and fault-tolerant quantum computation when combined with the Gottesman-Kitaev-Preskill (GKP) code and quan...
Modeling and mitigation of cross-talk effects in readout noise with applications to the Quantum Approximate Optimization Algorithm
Filip B. Maciejewski, F. Baccari, Z. Zimbor'as +1 more·Jan 7, 2021
Measurement noise is one of the main sources of errors in currently available quantum devices based on superconducting qubits. At the same time, the complexity of its characterization and mitigation often exhibits exponential scaling with the system ...