Papers
Live trends in quantum computing research, updated daily from arXiv.
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15,749 papers in 12 months (-37% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Improved quantum circuits for elliptic curve discrete logarithms
Thomas Häner, Samuel Jaques, M. Naehrig +2 more·Jan 27, 2020
We present improved quantum circuits for elliptic curve scalar multiplication, the most costly component in Shor's algorithm to compute discrete logarithms in elliptic curve groups. We optimize low-level components such as reversible integer and modu...
How symmetric is too symmetric for large quantum speedups?
S. Ben-David, Supartha Podder·Jan 27, 2020
Suppose a Boolean function $f$ is symmetric under a group action $G$ acting on the $n$ bits of the input. For which $G$ does this mean $f$ does not have an exponential quantum speedup? Is there a characterization of how rich $G$ must be before the fu...
Temporal Information Processing on Noisy Quantum Computers
Jiayin Chen, H. Nurdin, N. Yamamoto·Jan 26, 2020
The combination of machine learning and quantum computing has emerged as a promising approach for addressing previously untenable problems. Reservoir computing is an efficient learning paradigm that utilizes nonlinear dynamical systems for temporal i...
Theory of field-modulated spin valley orbital pseudospin physics
Feng-Wu Chen, Yu-Shu Wu·Jan 24, 2020
Pioneering studies in transition metal dichalcogenides have demonstrated convincingly the co-existence of multiple angular momentum degrees of freedom -- of spin (1/2 $s_z = \pm 1/2$), valley ($\tau = K, K'$ or $\pm 1$), and atomic orbital ($l_z = \p...
Optimal Fermionic swap networks for Hubbard models
Tobias J. Hagge·Jan 23, 2020
We propose a Fermionic swap network scheme for efficient quantum computing of $n$-dimensional Hubbard-model Hamiltonians, assuming linear qubit connectivity. We establish new lower bounds on swap depth for such networks. These rely on isoperimetric i...
Classically Simulating Quantum Circuits with Local Depolarizing Noise
Y. Takahashi, Yuki Takeuchi, S. Tani·Jan 23, 2020
We study the effect of noise on the classical simulatability of quantum circuits defined by computationally tractable (CT) states and efficiently computable sparse (ECS) operations. Examples of such circuits, which we call CT-ECS circuits, are IQP, C...
Absolutely maximally entangled states in tripartite heterogeneous systems
Yi Shen, Lin Chen·Jan 23, 2020
Absolutely maximally entangled (AME) states are closely related to quantum error correction codes. They are typically defined in homogeneous systems. However, the heterogeneous system is very common in a practical setup. In this work, we focus on the...
Towards Post-Quantum Blockchain: A Review on Blockchain Cryptography Resistant to Quantum Computing Attacks
T. Fernández-Caramés, Paula Fraga-Lamas·Jan 23, 2020
Blockchain and other Distributed Ledger Technologies (DLTs) have evolved significantly in the last years and their use has been suggested for numerous applications due to their ability to provide transparency, redundancy and accountability. In the ca...
Demonstrating a Continuous Set of Two-Qubit Gates for Near-Term Quantum Algorithms.
B. Foxen, C. Neill, A. Dunsworth +54 more·Jan 23, 2020
Quantum algorithms offer a dramatic speedup for computational problems in material science and chemistry. However, any near-term realizations of these algorithms will need to be optimized to fit within the finite resources offered by existing noisy h...
Modeling noisy quantum circuits using experimental characterization
Megan L. Dahlhauser, T. Humble·Jan 23, 2020
Noisy intermediate-scale quantum (NISQ) devices offer unique platforms to test and evaluate the behavior of non-fault-tolerant quantum computing. However, validating programs on NISQ devices is difficult due to fluctuations in the underlying noise so...
A Quantum Instruction Set Implemented on a Superconducting Quantum Processor
M. Kjaergaard, M. Schwartz, A. Greene +20 more·Jan 23, 2020
A quantum algorithm consists of a sequence of operations and measurements applied to a quantum processor. To date, the instruction set which defines this sequence has been provided by a classical computer and passed via control hardware to the quantu...
To quantum or not to quantum: towards algorithm selection in near-term quantum optimization
Charles Moussa, H. Calandra, V. Dunjko·Jan 22, 2020
The Quantum approximate optimization algorithm (QAOA) constitutes one of the often mentioned candidates expected to yield a quantum boost in the era of near-term quantum computing. In practice, quantum optimization will have to compete with cheaper c...
Quantum Computation and Measurements from an Exotic Space-Time R4
M. Planat, Raymond Aschheim, Marcelo M. Amaral +1 more·Jan 22, 2020
The authors previously found a model of universal quantum computation by making use of the coset structure of subgroups of a free group G with relations. A valid subgroup H of index d in G leads to a ‘magic’ state ψ in d-dimensional Hilbert space tha...
Testing a quantum error-correcting code on various platforms.
Qihao Guo, Yuan-Yuan Zhao, M. Grassl +5 more·Jan 22, 2020
Quantum error correction plays an important role in fault-tolerant quantum information processing. It is usually difficult to experimentally realize quantum error correction, as it requires multiple qubits and quantum gates with high fidelity. Here w...
Natural and bionic neuronal membranes: possible sites for quantum biology
L. Smolin·Jan 21, 2020
A new concept for bionic quantum technology is presented based on a hybrid of a silicon wafer on which is layered a phospholipid membrane, such as is found in biological cell membranes. The phosphorus atoms in the head groups of the membranes carry n...
Causal and compositional structure of unitary transformations
Robin Lorenz, J. Barrett·Jan 21, 2020
The causal structure of a unitary transformation is the set of relations of possible influence between any input subsystem and any output subsystem. We study whether such causal structure can be understood in terms of compositional structure of the u...
Symmetries and entanglement of stabilizer states
Matthias Englbrecht, B. Kraus·Jan 20, 2020
Stabilizer states constitute a set of pure states which plays a dominant role in quantum error correction, measurement--based quantum computation, and quantum communication. Central in these applications are the local symmetries of these states. We c...
Test of the unitary coupled-cluster variational quantum eigensolver for a simple strongly correlated condensed-matter system
Luogen Xu, Joseph T. Lee, J. Freericks·Jan 20, 2020
The variational quantum eigensolver has been proposed as a low-depth quantum circuit that can be employed to examine strongly correlated systems on today's noisy intermediate-scale quantum computers. We examine details associated with the factorized ...
Context-Sensitive and Duration-Aware Qubit Mapping for Various NISQ Devices
Yu Zhang, Haowei Deng, Quanxi Li·Jan 19, 2020
Quantum computing (QC) technologies have reached a second renaissance in the last decade. Some fully programmable QC devices have been built based on superconducting or ion trap technologies. Although different quantum technologies have their own par...
A Scalable Decoder Micro-architecture for Fault-Tolerant Quantum Computing
Poulami Das, C. Pattison, Srilatha Manne +4 more·Jan 18, 2020
Quantum computation promises significant computational advantages over classical computation for some problems. However, quantum hardware suffers from much higher error rates than in classical hardware. As a result, extensive quantum error correction...