Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Generalized quantum circuit differentiation rules
O. Kyriienko, V. Elfving·Aug 3, 2021
Variational quantum algorithms that are used for quantum machine learning rely on the ability to automatically differentiate parametrized quantum circuits with respect to underlying parameters. Here, we propose the rules for differentiating quantum c...
Fault-tolerant operation of a logical qubit in a diamond quantum processor
M. Abobeih, Y. Wang, J. Randall +6 more·Aug 3, 2021
Solid-state spin qubits is a promising platform for quantum computation and quantum networks1,2. Recent experiments have demonstrated high-quality control over multi-qubit systems3–8, elementary quantum algorithms8–11 and non-fault-tolerant error cor...
Long-time error-mitigating simulation of open quantum systems on near term quantum computers
Brian Rost, L. Del Re, N. Earnest +3 more·Aug 2, 2021
We study an open quantum system simulation on quantum hardware, which demonstrates robustness to hardware errors even with deep circuits containing up to two thousand entangling gates. We simulate two systems of electrons coupled to an infinite therm...
Hybrid Classical-Quantum Deep Learning Models for Autonomous Vehicle Traffic Image Classification Under Adversarial Attack
Reek Majumder, S. Khan, Fahim Ahmed +6 more·Aug 2, 2021
Image classification must work for autonomous vehicles (AV) operating on public roads, and actions performed based on image misclassification can have serious consequences. Traffic sign images can be misclassified by an adversarial attack on machine ...
Quantum state preparation protocol for encoding classical data into the amplitudes of a quantum information processing register's wave function
S. Ashhab·Jul 29, 2021
We present a protocol for encoding N real numbers stored in N memory registers into the amplitudes of the quantum superposition that describes the state of log2N qubits. This task is one of the main steps in quantum machine learning algorithms applie...
Sensing dot with high output swing for scalable baseband readout of spin qubits
E. Kammerloher, A. Schmidbauer, L. Diebel +9 more·Jul 28, 2021
A crucial requirement for quantum computing, in particular for scalable quantum computing and error correction, is a fast and high-fidelity qubit readout. For semiconductor based qubits, one limiting factor for local low-power signal amplification, i...
Mitigating noise in digital and digital–analog quantum computation
Paula Garc'ia-Molina, Ana Martin, Mikel Garcia de Andoin +1 more·Jul 27, 2021
Noisy Intermediate-Scale Quantum (NISQ) devices lack error correction, limiting scalability for quantum algorithms. In this context, digital-analog quantum computing (DAQC) offers a more resilient alternative quantum computing paradigm that outperfor...
General parameter-shift rules for quantum gradients
David Wierichs, J. Izaac, C. Wang +1 more·Jul 26, 2021
Variational quantum algorithms are ubiquitous in applications of noisy intermediate-scale quantum computers. Due to the structure of conventional parametrized quantum gates, the evaluated functions typically are finite Fourier series of the input par...
Quantum gates with weak van der Waals interactions of neutral Rydberg atoms
Xiao-Feng Shi, Yan Lu·Jul 26, 2021
Neutral atoms are promising for large-scale quantum computing, but accurate neutral-atom entanglement depends on large Rydberg interactions which strongly limit the interatomic distances. Via a phase accumulation in detuned Rabi cycles enabled by a R...
Experimental demonstration of continuous quantum error correction
W. Livingston, M. Blok, E. Flurin +3 more·Jul 23, 2021
The storage and processing of quantum information are susceptible to external noise, resulting in computational errors. A powerful method to suppress these effects is quantum error correction. Typically, quantum error correction is executed in discre...
Heat-Driven Electron-Motion in a Nanoscale Electronic Circuit
S. Takada, G. Georgiou, E. Arrighi +8 more·Jul 20, 2021
We study the interaction between two closely spaced but electrically isolated quasi-onedimensional electrical wires by a drag experiment. In this work we experimentally demonstrate the generation of current in an unbiased (drag) wire, which results f...
Prime factorization using quantum variational imaginary time evolution
R. Selvarajan, Vivek Dixit, X. Cui +2 more·Jul 19, 2021
The road to computing on quantum devices has been accelerated by the promises that come from using Shor’s algorithm to reduce the complexity of prime factorization. However, this promise hast not yet been realized due to noisy qubits and lack of robu...
Module for arbitrary controlled rotation in gate-based quantum algorithms
W. Cui, Shilu Yan·Jul 17, 2021
To assess whether a gate-based quantum algorithm can be executed successfully on a noisy intermediate-scale quantum (NISQ) device, both complexity and actual value of quantum resources should be considered carefully. Based on quantum phase estimation...
Quantum circuits with classical channels and the principle of deferred measurements
Y. Gurevich, A. Blass·Jul 17, 2021
We define syntax and semantics of quantum circuits, allowing measurement gates and classical channels. We define circuit-based quantum algorithms and prove that, semantically, any such algorithm is equivalent to a single measurement that depends only...
Fast suppression of classification error in variational quantum circuits
Bingzhi Zhang, Quntao Zhuang·Jul 16, 2021
Variational quantum circuits (VQCs) have shown great potential in near-term applications. However, the discriminative power of a VQC, in connection to its circuit architecture and depth, is not understood. To unleash the genuine discriminative power ...
Analytic gradients in variational quantum algorithms: Algebraic extensions of the parameter-shift rule to general unitary transformations
A. Izmaylov, Robert A. Lang, Tzu-Ching Yen·Jul 16, 2021
Optimization of unitary transformations in Variational Quantum Algorithms benefits highly from efficient evaluation of cost function gradients with respect to amplitudes of unitary generators. We propose several extensions of the parametric-shift-rul...
Implementing efficient selective quantum process tomography of superconducting quantum gates on IBM quantum experience
Akshay Gaikwad, Krishna Shende, Arvind +1 more·Jul 15, 2021
The experimental implementation of selective quantum process tomography (SQPT) involves computing individual elements of the process matrix with the help of a special set of states called quantum 2-design states. However, the number of experimental s...
Floquet prethermal phase protected by U(1) symmetry on a superconducting quantum processor
C. Ying, Qi Guo, Shaowei Li +22 more·Jul 15, 2021
Periodically driven systems, or Floquet systems, exhibit many novel dynamics and interesting outof-equilibrium phases of matter. Those phases arising with the quantum systems’ symmetries, such as global U(1) symmetry, can even show dynamical stabilit...
Efficient quantum programming using EASE gates on a trapped-ion quantum computer
Nikodem Grzesiak, A. Maksymov, Pradeep Niroula +1 more·Jul 15, 2021
Parallel operations in conventional computing have proven to be an essential tool for efficient and practical computation, and the story is not different for quantum computing. Indeed, there exists a large body of works that study advantages of paral...
Realization of Real-Time Fault-Tolerant Quantum Error Correction
C. Ryan-Anderson, J. Bohnet, K. Lee +14 more·Jul 15, 2021
Correcting errors in real time is essential for reliable large-scale quantum computations. Realizing this high-level function requires a system capable of several low-level primitives, including single-qubit and two-qubit operations, mid-circuit meas...