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Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
The resource cost of large scale quantum computing
Marco Fellous Asiani·Dec 7, 2021
Cette thèse traite des questions de mise à l'échelle du calcul quantique tolérant aux fautes. Ces questions sont étudiées sous l'angle de l'estimation des ressources nécessaires à la mise en place de tels ordinateurs: maintenant que les premiers pr...
Distance-four quantum codes with combined postselection and error correction
Prithviraj Prabhu, B. Reichardt·Dec 7, 2021
When storing encoded qubits, if single faults can be corrected and double faults postselected against, logical errors only occur due to at least three faults. At current noise rates, having to restart when two errors are detected prevents very long-t...
Quantum readout error mitigation via deep learning
Jihye Kim, Byungdu Oh, Y. Chong +2 more·Dec 7, 2021
Quantum computing devices are inevitably subject to errors. To leverage quantum technologies for computational benefits in practical applications, quantum algorithms and protocols must be implemented reliably under noise and imperfections. Since nois...
Tensor network approach to the two-dimensional fully frustrated XY model and a chiral ordered phase
Fengmin Song, Guang-Ming Zhang·Dec 7, 2021
A general framework is proposed to solve the two-dimensional fully frustrated XY model for the Josephson junction arrays in a perpendicular magnetic field. The essential idea is to encode the ground-state local rules induced by frustrations in the loc...
Quantum Annealing in the NISQ Era: Railway Conflict Management
K. Domino, M. Koniorczyk, K. Krawiec +3 more·Dec 7, 2021
We are in the noisy intermediate-scale quantum (NISQ) devices’ era, in which quantum hardware has become available for application in real-world problems. However, demonstrations of the usefulness of such NISQ devices are still rare. In this work, we...
Quantum simulation of chiral phase transitions
Alexander M. Czajka, Zhong-Bo Kang, Henry Ma +1 more·Dec 7, 2021
The Nambu–Jona-Lasinio (NJL) model has been widely studied for investigating the chiral phase structure of strongly interacting matter. The study of the thermodynamics of field theories within the framework of Lattice Field Theory is limited by the s...
Spatial search on Johnson graphs by discrete-time quantum walk
Hajime Tanaka, Mohamed Sabri, R. Portugal·Dec 7, 2021
The spatial search problem aims to find a marked vertex of a finite graph using a dynamic with two constraints: (1) the walker has no compass and (2) the walker can check whether a vertex is marked only after reaching it. This problem is a generaliza...
Feasibility study of quantum computing using trapped electrons
Qian Yu, A. Alonso, Jackie Caminiti +7 more·Dec 7, 2021
We investigate the feasibility of using electrons in a linear Paul trap as qubits in a future quantum computer. We discuss the necessary experimental steps to realize such a device through a concrete design proposal, including trapping, cooling, elec...
Local quantum overlapping tomography
Bruna G. M. Ara'ujo, M. M. Taddei, D. Cavalcanti +1 more·Dec 7, 2021
Reconstructing the full quantum state of a many-body system requires the estimation of a number of parameters that grows exponentially with system size. Nevertheless, there are situations in which one is only interested in a subset of these parameter...
Quantum error correction in the noisy intermediate-scale quantum regime for sequential quantum computing
Arvid Rolander, A. Kinos, A. Walther·Dec 7, 2021
We use density matrix simulations to study the performance of three distance three quantum error correcting codes in the context of the rare-earth-ion-doped crystal (RE) platform for quantum computing. We analyze pseudothresholds for these codes when...
A quantum processor based on coherent transport of entangled atom arrays
D. Bluvstein, H. Levine, G. Semeghini +9 more·Dec 7, 2021
The ability to engineer parallel, programmable operations between desired qubits within a quantum processor is key for building scalable quantum information systems1,2. In most state-of-the-art approaches, qubits interact locally, constrained by the ...
Realizing repeated quantum error correction in a distance-three surface code
S. Krinner, N. Lacroix, A. Remm +13 more·Dec 7, 2021
Quantum computers hold the promise of solving computational problems that are intractable using conventional methods1. For fault-tolerant operation, quantum computers must correct errors occurring owing to unavoidable decoherence and limited control ...
QKSA: Quantum Knowledge Seeking Agent - resource-optimized reinforcement learning using quantum process tomography
A. Sarkar, Z. Al-Ars, H. Gandhi +1 more·Dec 7, 2021
In this research, we extend the universal reinforcement learning (URL) agent models of artificial general intelligence to quantum environments. The utility function of a classical exploratory stochastic Knowledge Seeking Agent, KL-KSA, is generalized...
Fundamental trade-off relation in probabilistic entanglement generation
Yuanbo Chen, Yoshihiko Hasegawa·Dec 6, 2021
We investigate the generation of entanglement between two non-interacting systems by synthesizing a new quantum process from the superposition of distinct processes characterized by local-only operations. Our analysis leads to the derivation of a uni...
Building blocks of a flip-chip integrated superconducting quantum processor
S. Kosen, Hang Li, Marcus Rommel +22 more·Dec 6, 2021
We have integrated single and coupled superconducting transmon qubits into flip-chip modules. Each module consists of two chips—one quantum chip and one control chip—that are bump-bonded together. We demonstrate time-averaged coherence times exceedin...
Hybrid quantum-classical algorithm for computing imaginary-time correlation functions
Rihito Sakurai, W. Mizukami, H. Shinaoka·Dec 6, 2021
Quantitative descriptions of strongly correlated materials pose a considerable challenge in condensed matter physics and chemistry. A promising approach to address this problem is quantum embedding methods. In particular, the dynamical mean-field the...
Qubit noise deconvolution
Stefano Mangini, L. Maccone, C. Macchiavello·Dec 6, 2021
We present a noise deconvolution technique to remove a wide class of noises when performing arbitrary measurements on qubit systems. In particular, we derive the inverse map of the most common single qubit noisy channels, and exploit it at the data p...
Dynamic Asset Allocation with Expected Shortfall via Quantum Annealing
Hanjing Xu, S. Dasgupta, A. Pothen +1 more·Dec 6, 2021
Recent advances in quantum hardware offer new approaches to solve various optimization problems that can be computationally expensive when classical algorithms are employed. We propose a hybrid quantum-classical algorithm to solve a dynamic asset all...
Invariance of success probability in Grover's quantum search under local noise with memory
Sheikh Parvez Mandal, Ahana Ghoshal, Chirag Srivastava +1 more·Dec 5, 2021
We analyze the robustness of Grover's quantum search algorithm performed by a quantum register under a possibly time-correlated noise acting locally on the qubits. We model the noise as originating from an arbitrary but fixed unitary evolution, $U$, ...
Topological graph states and quantum error-correction codes
Pengcheng Liao, B. Sanders, D. Feder·Dec 5, 2021
Deciding if a given family of quantum states is topologically ordered is an important but nontrivial problem in condensed matter physics and quantum information theory. We derive necessary and sufficient conditions for a family of graph states to be in...