Papers

L. Abdurakhimov, I. Mahboob, H. Toida +3 more·Dec 10, 2021

Parasitic two-level-system (TLS) defects are one of the major factors limiting the coherence times of superconducting qubits. Although there has been significant progress in characterizing basic parameters of TLS defects, exact mechanisms of interacti...

Y. Futamura, Xiucai Ye, T. Sakurai·Dec 10, 2021

The eigenvalue density of a matrix plays an important role in various types of scientific computing such as electronic-structure calculations. In this paper, we propose a quantum algorithm for computing the eigenvalue density in a given interval. Our...

Esther Ye, Samuel Yen-Chi Chen·Dec 10, 2021

Quantum computing has promised significant improvement in solving difficult computational tasks over classical computers. Designing quantum circuits for practical use, however, is not a trivial objective and requires expert-level knowledge. To aid th...

Yuta Tsuchimoto, M. Kroner·Dec 9, 2021

Quantum transducers between microwave and optical photons are essential for long-distance quantum networks based on superconducting qubits. An optically active self-assembled quantum dot molecule (QDM) is an attractive platform for the implementati...

Raphael Brieger, I. Roth, M. Kliesch·Dec 9, 2021

Flexible characterization techniques that identify and quantify experimental imperfections under realistic assumptions are crucial for the development of quantum computers. Gate set tomography is a characterization approach that simultaneously and se...

D. Zhu, Gregory D. Kahanamoku-Meyer, L. Lewis +15 more·Dec 9, 2021

Achieving quantum computational advantage requires solving a classically intractable problem on a quantum device. Natural proposals rely upon the intrinsic hardness of classically simulating quantum mechanics; however, verifying the output is itself ...

Daniel Centeno, G. Sierra·Dec 9, 2021

The Chinos game is a non-cooperative game between players who try to guess the total sum of coins drawn collectively. Semiclassical and quantum versions of this game were proposed by F. Guinea and M. A. Martin-Delgado, in J. Phys. A: Math. Gen. 36 L1...

John P. T. Stenger, D. Gunlycke, C. Hellberg·Dec 9, 2021

We present a hybrid classical/quantum algorithm for efficiently solving the eigenvalue problem of many-particle Hamiltonians on quantum computers with limited resources by splitting the workload between classical and quantum processors. This algorith...

A. Rajput, A. Roggero, N. Wiebe·Dec 9, 2021

Quantum simulations of lattice gauge theories (LGTs) are often formulated on an enlarged Hilbert space containing both physical and unphysical sectors in order to retain a local Hamiltonian. We provide simple fault-tolerant procedures that exploit su...

G. Khan, Hudaiba Soomro, M. U. Baig +2 more·Dec 9, 2021

It is well known that repeated projective measurements can either speed up (the Zeno effect) or slow down (the anti-Zeno effect) quantum evolution. Until now, however, studies of these effects for a two-level system interacting strongly with its envi...

Arshag Danageozian, M. Wilde, F. Buscemi·Dec 9, 2021

Quantum error correction (QEC) is a procedure by which the quantum state of a system is protected against a known type of noise, by preemptively adding redundancy to that state. Such a procedure is commonly used in quantum computing when thermal nois...

Hao Song, Janik Schönmeier-Kromer, Ke Liu +3 more·Dec 9, 2021

Fracton models provide examples of novel gapped quantum phases of matter that host intrinsically immobile excitations and therefore lie beyond the conventional notion of topological order. Here, we calculate optimal error thresholds for quantum error...

Keiichiro Furuya, Nima Lashkari, Mudassir Moosa·Dec 9, 2021

In renormalization group (RG) flow, the low energy states form a code subspace that is approximately protected against the local short-distance errors. We motivate this connection with an example of spin-blocking RG in classical spin models. We consi...

Imran Bashir, D. Leipold, E. Blokhina +9 more·Dec 8, 2021

The proliferation of quantum computing technologies has fueled the race to build a practical quantum computer. The spectrum of the innovation is wide and encompasses many aspects of this technology, such as the qubit, control and detection mechanism,...

James Sud, Jeffrey Marshall, Zhihui Wang +2 more·Dec 8, 2021

In order to understand the capabilities and limitations of quantum computers, it is necessary to develop methods that efficiently characterize and benchmark error channels present on these devices. In this paper, we present a method that faithfully r...

Benchen Huang, M. Govoni, G. Galli·Dec 8, 2021

We present calculations of both the ground and excited state energies of spin defects in solids carried out on a quantum computer, using a hybrid classical/quantum protocol. We focus on the negatively charged nitrogen vacancy center in diamond and on...

S. Maiti, Kornikar Sen, U. Sen·Dec 8, 2021

We investigate the response to noise, in the form of glassy disorder present in circuit elements, in the success probability of the quantum phase estimation algorithm, a subroutine used to determine the eigenvalue - a phase - corresponding to an eige...

B. Fauseweh, Jian-Xin Zhu·Dec 8, 2021

Quantum systems can be dynamically controlled using time-periodic external fields, leading to the concept of Floquet engineering, with promising technological applications. Computing Floquet energy spectra is harder than only computing ground state p...

Rosie Cane, Daryus Chandra, S. Ng +1 more·Dec 8, 2021

Experiments conducted on open-access cloud-based IBM Quantum devices are presented for characterizing their fault tolerance using [4,2,2]-encoded gate sequences. Up to 100 logical gates are activated in the Ibmq_Bogota and Ibmq_Santiago devices and w...

Florian Meier, Lídia del Rio·Dec 8, 2021

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