Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
A Hybrid Quantum-Classical Approach to Mitigating Measurement Errors in Quantum Algorithms
Hyeokjea Kwon, J. Bae·Mar 27, 2020
When noisy intermediate scalable quantum (NISQ) devices are applied in information processing, all of the stages through preparation, manipulation, and measurement of multipartite qubit states contain various types of noise that are generally hard to...
Robust quantum minimum finding with an application to hypothesis selection
Yihui Quek, C. Canonne, P. Rebentrost·Mar 26, 2020
We consider the problem of finding the minimum element in a list of length $N$ using a noisy comparator. The noise is modelled as follows: given two elements to compare, if the values of the elements differ by at least $\alpha$ by some metric defined...
Efficiently computing logical noise in quantum error-correcting codes
Stefanie J. Beale, Joel J. Wallman·Mar 23, 2020
Quantum error correction protocols have been developed to offset the high sensitivity to noise inherent in quantum systems. However, much is still unknown about the behaviour of a quantum error-correcting code under general noise, including noisy mea...
Quantum noise protects quantum classifiers against adversaries
Yuxuan Du, Min-Hsiu Hsieh, Tongliang Liu +2 more·Mar 20, 2020
Noise in quantum information processing is often viewed as a disruptive and difficult-to-avoid feature, especially in near-term quantum technologies. However, noise has often played beneficial roles, from enhancing weak signals in stochastic resonanc...
Scalable integrated single-photon source
R. Uppu, Freja T. Pedersen, Ying Wang +8 more·Mar 19, 2020
An on-chip deterministic source generating more than 100 identical photons meets the resource requirement for quantum advantage. Photonic qubits are key enablers for quantum information processing deployable across a distributed quantum network. An o...
Resource Efficient Zero Noise Extrapolation with Identity Insertions
Andre He, B. Nachman, W. A. Jong +1 more·Mar 10, 2020
In addition to readout errors, two-qubit gate noise is the main challenge for complex quantum algorithms on noisy intermediate-scale quantum (NISQ) computers. These errors are a significant challenge for making accurate calculations for quantum chemi...
Robust decompositions of quantum states
J. Moussa·Mar 9, 2020
Classical-quantum computational complexity separations are an important motivation for the long-term development of digital quantum computers, but classical-quantum complexity equivalences are just as important in our present era of noisy intermediat...
A Quantum Algorithm for Model-Independent Searches for New Physics
Konstantin T. Matchev, P. Shyamsundar, Jordan Smolinsky·Mar 4, 2020
We propose a novel quantum technique to search for unmodelled anomalies in multi-dimensional binned collider data. We propose to associate an Ising lattice spin site with each bin, with the Ising Hamiltonian suitably constructed from the observed dat...
Hierarchies of localizable entanglement due to spatial distribution of local noise
R. Banerjee, A. Pal, Aditi Sen(De)·Mar 4, 2020
Complete characterization of a noisy multipartite quantum state in terms of entanglement requires full knowledge of how the entanglement content in the state is affected by the spatial distribution of noise in the state. Specifically, we find that if...
Layerwise learning for quantum neural networks
Andrea Skolik, J. McClean, M. Mohseni +2 more·Mar 2, 2020
With the increased focus on quantum circuit learning for near-term applications on quantum devices, in conjunction with unique challenges presented by cost function landscapes of parametrized quantum circuits, strategies for effective training are be...
Chemistry on Quantum Computers with Virtual Quantum Subspace Expansion.
M. Urbánek, Daan Camps, Roel Van Beeumen +1 more·Feb 28, 2020
Simulating chemical systems on quantum computers has been limited to a few electrons in a minimal basis. We demonstrate experimentally that the virtual quantum subspace expansion (Takeshita, T.; Phys. Rev. X 2020, 10, 011004, 10.1103/PhysRevX.10.0110...
Predicting excited states from ground state wavefunction by supervised quantum machine learning
H. Kawai, Yuya O. Nakagawa·Feb 28, 2020
Excited states of molecules lie in the heart of photochemistry and chemical reactions. The recent development in quantum computational chemistry leads to inventions of a variety of algorithms that calculate the excited states of molecules on near-ter...
Thermal Stability of Dynamical Phase Transitions in Higher Dimensional Stabilizer Codes
A. Schmitz·Feb 26, 2020
For all of the interest in dynamical phase transitions (DPT), it is still not clear the meaning or prevalence of these features in higher dimensional models. In this paper, we consider DPTs for stabilizer code models and quantum quenches between thes...
Correcting Spanning Errors With a Fractal Code
Georgia M. Nixon, Benjamin J. Brown·Feb 26, 2020
The strongly correlated systems we use to realise quantum error-correcting codes may give rise to high-weight, problematic errors. Encouragingly, we can expect local quantum error-correcting codes with no string-like logical operators — such as the c...
Anneal-path correction in flux qubits
M. Khezri, J. Grover, J. Basham +5 more·Feb 25, 2020
Quantum annealers require accurate control and optimized operation schemes to reduce noise levels, in order to eventually demonstrate a computational advantage over classical algorithms. We study a high coherence four-junction capacitively shunted fl...
Experimental deterministic correction of qubit loss
R. Stricker, D. Vodola, A. Erhard +7 more·Feb 21, 2020
The successful operation of quantum computers relies on protecting qubits from decoherence and noise, which—if uncorrected—will lead to erroneous results. Because these errors accumulate during an algorithm, correcting them is a key requirement for l...
Alibaba Cloud Quantum Development Platform: Surface Code Simulations with Crosstalk
Cupjin Huang, Xiaotong Ni, Fang Zhang +11 more·Feb 20, 2020
We report, in a sequence of notes, our work on the Alibaba Cloud Quantum Development Platform (AC-QDP). AC-QDP provides a set of tools for aiding the development of both quantum computing algorithms and quantum processors, and is powered by a large-s...
Hardware-Encoding Grid States in a Nonreciprocal Superconducting Circuit
Martin Rymarz, S. Bosco, A. Ciani +1 more·Feb 18, 2020
We present a circuit design composed of a non-reciprocal device and Josephson junctions whose ground space is doubly degenerate and the ground states are approximate codewords of the Gottesman-Kitaev-Preskill (GKP) code. We determine the low-energy d...
Leakage detection for a transmon-based surface code
B. Varbanov, F. Battistel, B. Tarasinski +4 more·Feb 17, 2020
Leakage outside of the qubit computational subspace, present in many leading experimental platforms, constitutes a threatening error for quantum error correction (QEC) for qubits. We develop a leakage-detection scheme via Hidden Markov models (HMMs) ...
Beyond Single-Shot Fault-Tolerant Quantum Error Correction
Nicolas Delfosse, B. Reichardt, K. Svore·Feb 12, 2020
Extensive quantum error correction is necessary in order to perform a useful computation on a noisy quantum computer. Moreover, quantum error correction must be implemented based on imperfect parity check measurements that may return incorrect outcom...