Papers

Daniel Oliveira, Edoardo Giusto, Betis Baheri +3 more·Nov 13, 2021

Quantum computing is one of the most promising technology advances of the latest years. Qubits are highly sensitive to noise, which can make the output useless. Lately, it has been shown that superconducting qubits are extremely susceptible to extern...

Nithin Raveendran, Narayanan Rengaswamy, F. Rozpędek +3 more·Nov 13, 2021

Quantum error correction has recently been shown to benefit greatly from specific physical encodings of the code qubits. In particular, several researchers have considered the individual code qubits being encoded with the continuous variable Gottesma...

Armands Strikis, S. Benjamin, Benjamin J. Brown·Nov 11, 2021

To successfully execute large-scale algorithms, a quantum computer will need to perform its elementary operations near perfectly. This is a fundamental challenge since all physical qubits suffer a considerable level of noise. Moreover, real systems a...

Yoshinori Aono, Sitong Liu, Tomoki Tanaka +4 more·Nov 11, 2021

The discrete logarithm problem (DLP) is the basis for several cryptographic primitives. Since Shor’s work, it has been known that the DLP can be solved by combining a polynomial-size quantum circuit and a polynomial-time classical postprocessing algo...

Ivana Miháliková, Matej Pivoluska, Martin Plesch +3 more·Nov 9, 2021

New approaches into computational quantum chemistry can be developed through the use of quantum computing. While universal, fault-tolerant quantum computers are still not available, and we want to utilize today’s noisy quantum processors. One of thei...

J. Tilly, Hongxiang Chen, Shuxiang Cao +8 more·Nov 9, 2021

The variational quantum eigensolver (or VQE) uses the variational principle to compute the ground state energy of a Hamiltonian, a problem that is central to quantum chemistry and condensed matter physics. Conventional computing methods are constrain...

L. Lao, A. Korotkov, Zhang Jiang +3 more·Nov 8, 2021

Two-qubit gates are important components of quantum computing. However, unwanted interactions between qubits (so-called parasitic gates) can be particularly problematic and degrade the performance of quantum applications. In this work, we present two...

Manuel S. Rudolph, Sukin Sim, A. Raza +5 more·Nov 8, 2021

Variational Quantum Algorithms (VQAs) are promising candidates for finding practical applications of near to mid-term quantum computers. There has been an increasing effort to study the intricacies of VQAs, such as the presence or absence of barren p...

Sebastian Brandhofer, S. Devitt, I. Polian·Nov 8, 2021

Variational quantum algorithms have been one of the most intensively studied applications for near-term quantum computing applications. The noisy intermediate-scale quantum (NISQ) regime, where small enough algorithms can be run successfully on noisy...

Jonathan Foldager, Arthur Pesah, L. K. Hansen·Nov 6, 2021

Preparing thermal states on a quantum computer can have a variety of applications, from simulating many-body quantum systems to training machine learning models. Variational circuits have been proposed for this task on near-term quantum computers, bu...

Chin-te Liao, S. Bahrani, Francisco Ferreira da Silva +1 more·Nov 3, 2021

Quantum network protocols offer new functionalities such as enhanced security to communication and computational systems. Despite the rapid progress in quantum hardware, it has not yet reached a level of maturity that enables execution of many quantu...

Ningping Cao, Junan Lin, D. Kribs +3 more·Nov 3, 2021

Error-correcting codes were invented to correct errors on noisy communication channels. Quantum error correction (QEC), however, may have a wider range of uses, including information transmission, quantum simulation/computation, and fault-tolerance. ...

S. Isakov, D. Kafri, O. Martin +15 more·Nov 3, 2021

We introduce multinode quantum trajectory simulations with qsim, an open source high performance simulator of quantum circuits. qsim can be used as a backend of Cirq, a Python software library for writing quantum circuits. We present a novel delayed ...

Patrick Selig, Niall Murphy, Ashwin Sundareswaran R +2 more·Nov 1, 2021

There is increasing interest in the development of gate- based quantum circuits for the training of machine learning models. Yet, little is understood concerning the parameters of circuit design, and the effects of noise and other measurement errors ...

S. Mandrà, Jeffrey Marshall, E. Rieffel +1 more·Nov 1, 2021

Developing state-of-the-art classical simulators of quantum circuits is of utmost importance to test and evaluate early quantum technology and understand the true potential of full-blown error-corrected quantum computers. In the past few years, multi...

J. Krause, C. Dickel, E. Vaal +6 more·Nov 1, 2021

Magnetic-field-resilient superconducting circuits enable sensing applications and hybrid quantum-computing architectures involving spin or topological qubits and electro-mechanical elements, as well as studying flux noise and quasiparticle loss. We i...

Austin J. Adams, Elton Pinto, Jeffrey Young +4 more·Oct 30, 2021

Ion trap quantum hardware promises to provide a computational advantage over classical computing for specific problem spaces while also providing an alternative hardware implementation path to cryogenic quantum systems as typified by IBM's quantum ha...

K. Seetharam, Dries Sels, E. Demler·Oct 29, 2021

The utility of near-term quantum computers and simulators is likely to rely upon software-hardware codesign, with error-aware algorithms and protocols optimized for the platforms they are run on. Here, we show how knowledge of noise in a system can b...

D. Babukhin, W. Pogosov·Oct 28, 2021

Quantum walks are an analog of classical random walks in quantum systems. Quantum walks have smaller hitting times compared to classical random walks on certain types of graphs, leading to a quantum advantage of quantum-walks-based algorithms. An imp...

Hanrui Wang, Jiaqi Gu, Yongshan Ding +4 more·Oct 21, 2021

Parameterized Quantum Circuits (PQC) are promising towards quantum advantage on near-term quantum hardware. However, due to the large quantum noises (errors), the performance of PQC models has a severe degradation on real quantum devices. Take Quantu...