Papers
Live trends in quantum computing research, updated daily from arXiv.
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28,494
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13,591 papers in 12 months (-18% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum $k$-nearest neighbors algorithm
Afrad Basheer, A. Afham, S. Goyal·Mar 20, 2020
One of the simplest and most effective classical machine learning algorithms is the $k$-nearest neighbors algorithm ($k$NN) which classifies an unknown test state by finding the $k$ nearest neighbors from a set of $M$ train states. Here we present a ...
Hadamard-Free Circuits Expose the Structure of the Clifford Group
S. Bravyi, D. Maslov·Mar 20, 2020
The Clifford group plays a central role in quantum randomized benchmarking, quantum tomography, and error correction protocols. Here we study the structural properties of this group. We show that any Clifford operator can be uniquely written in the c...
Trapped Rydberg ions: A new platform for quantum information processing
A. Mokhberi, M. Hennrich, F. Schmidt-Kaler·Mar 19, 2020
Abstract In this chapter, we present an overview of experiments with trapped Rydberg ions and outline the advantages and challenges of developing applications of this new platform for quantum computing, sensing, and simulation. Trapped Rydberg ions f...
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...
Universal and optimal coin sequences for high entanglement generation in 1D discrete time quantum walks
A. Gratsea, F. Metz, T. Busch·Mar 16, 2020
Entanglement is a key resource in many quantum information applications and achieving high values independently of the initial conditions is an important task. Here we address the problem of generating highly entangled states in a discrete time quant...
Bogoliubov quasiparticles in superconducting qubits
L. Glazman, G. Catelani·Mar 9, 2020
Extending the qubit coherence times is a crucial task in building quantum information processing devices. In the three-dimensional cavity implementations of circuit QED, the coherence of superconducting qubits was improved dramatically due to cutting...
Quantum Information Scrambling on a Superconducting Qutrit Processor
M. Blok, V. Ramasesh, T. Schuster +7 more·Mar 6, 2020
The theory of quantum information provides a common language which links disciplines ranging from cosmology to condensed-matter physics. For example, the delocalization of quantum information in strongly-interacting many-body systems, known as quantu...
The No-go Theorem of Purification
S. Raeisi·Mar 4, 2020
The Shannon's bound for compression is believed to be one of the key restrictions for compression of quantum information. Here we show that the unitarity of the compression operation imposes significant restrictions on the compression of the entropy ...
Quantum Process Tomography of a Controlled-Phase Gate for Time-Bin Qubits
Hsin-Pin Lo, Takuya Ikuta, N. Matsuda +3 more·Mar 4, 2020
Time-bin qubits, where information is encoded in a single photon at different times, have been widely used in optical fiber and waveguide based quantum communications. With the recent developments in distributed quantum computation, it is logical to ...
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...
Internal Boundary Between Entanglement and Separability Within a Quantum State
Banghai Wang·Mar 1, 2020
Quantum states are the key mathematical objects in quantum mechanics, and entanglement lies at the heart of the nascent fields of quantum information processing and computation. However, there has not been a general, necessary and sufficient, and ope...
Near-optimal ground state preparation
Lin Lin, Yu Tong·Feb 28, 2020
Preparing the ground state of a given Hamiltonian and estimating its ground energy are important but computationally hard tasks. However, given some additional information, these problems can be solved efficiently on a quantum computer. We assume tha...
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...
Galois hulls of MDS codes and their quantum error correction
Meng Cao·Feb 28, 2020
The hull of linear codes plays an important role in quantum information and coding theory. In the present paper, by investigating the Galois hulls of generalized Reed-Solomon (GRS) codes and extended GRS codes over the finite field Fq, we give severa...
On estimating the entropy of shallow circuit outputs
A. Gheorghiu, M. Hoban·Feb 27, 2020
Estimating the entropy of probability distributions and quantum states is a fundamental task in information processing. Here, we examine the hardness of this task for the case of probability distributions or quantum states produced by shallow circuit...
Self-organized error correction in random unitary circuits with measurement
Ruihua Fan, S. Vijay, A. Vishwanath +1 more·Feb 27, 2020
Random measurements have been shown to induce a phase transition in an extended quantum system evolving under chaotic unitary dynamics, when the strength of measurements exceeds a threshold value. Below this threshold, a steady state with a sub-therm...
Quantum Distributed Complexity of Set Disjointness on a Line
F. Magniez, A. Nayak·Feb 26, 2020
Given \( x,y\in \lbrace 0,1\rbrace ^n \) , Set Disjointness consists in deciding whether \( x_i=y_i=1 \) for some index \( i \in [n] \) . We study the problem of computing this function in a distributed computing scenario in which the inputs \( x \) ...
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...
Teaching Quantum Computing through a Practical Software-driven Approach: Experience Report
Mariia Mykhailova, K. Svore·Feb 25, 2020
Quantum computing harnesses quantum laws of nature to enable new types of algorithms, not efficiently possible on traditional computers, that may lead to breakthroughs in crucial areas like materials science and chemistry. There is rapidly growing de...
Efficient Quantum Circuit Decompositions via Intermediate Qudits
Jonathan M. Baker, Casey Duckering, F. Chong·Feb 24, 2020
Many quantum algorithms make use of ancilla, additional qubits used to store temporary information during computation, to reduce the total execution time. Quantum computers will be resource-constrained for years to come so reducing ancilla requiremen...