Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum Circuit Depth Lower Bounds For Homological Codes
D. Aharonov, Y. Touati·Oct 9, 2018
We provide an $\Omega(log(n))$ lower bound for the depth of any quantum circuit generating the unique groundstate of Kitaev's spherical code. No circuit-depth lower bound was known before on this code in the general case where the gates can connect q...
Stationary Phase Method in Discrete Wigner Functions and Classical Simulation of Quantum Circuits
L. Kocia, P. Love·Oct 8, 2018
One of the lowest-order corrections to Gaussian quantum mechanics in infinite-dimensional Hilbert spaces are Airy functions: a uniformization of the stationary phase method applied in the path integral perspective. We introduce a "periodized stationa...
Quantum codes for quantum simulation of fermions on a square lattice of qubits
M. Steudtner, S. Wehner·Oct 5, 2018
Quantum simulation of fermionic systems is a promising application of quantum computers, but to program them, we need to map fermionic states and operators to qubit states and quantum gates. While quantum processors may be built as two-dimensional qu...
Graph comparison via nonlinear quantum search
M. Chiew, K. de Lacy, C. Yu +2 more·Oct 3, 2018
Graph comparison is an established NP-hard problem. In this paper, we present an efficiently scaling quantum algorithm which finds the size of the maximum common edge subgraph for any pair of unlabelled graphs and thus provides a meaningful measure o...
Quantum Circuit Designs of Integer Division Optimizing T-count and T-depth
H. Thapliyal, Edgard Muñoz-Coreas, T. Varun +1 more·Sep 25, 2018
Quantum circuits for mathematical functions such as division are necessary to use quantum computers for scientific computing. Quantum circuits based on Clifford+T gates can easily be made fault-tolerant but the T gate is very costly to implement. The...
T-count Optimized Quantum Circuits for Bilinear Interpolation
Edgard Muñoz-Coreas, H. Thapliyal·Sep 24, 2018
Quantum circuits for basic image processing functions such as bilinear interpolation are required to implement image processing algorithms on quantum computers. In this work, we propose quantum circuits for the bilinear interpolation of NEQR encoded ...
Quantum interference device for controlled two-qubit operations
N. Loft, M. Kjaergaard, L. B. Kristensen +5 more·Sep 24, 2018
Universal quantum computing relies on high-fidelity entangling operations. Here, we demonstrate that four coupled qubits can operate as a quantum gate, where two qubits control the operation on two target qubits (a four-qubit gate). This configuratio...
Fast, Accurate, and Realizable Two-Qubit Entangling Gates by Quantum Interference in Detuned Rabi Cycles of Rydberg Atoms
Xiao-Feng Shi·Sep 24, 2018
High-fidelity entangling quantum gates based on Rydberg interactions are required for scalable quantum computing with neutral atoms. Their realization, however, meets a major stumbling block -- the motion-induced dephasing of the transition between t...
A hybrid universal blind quantum computation
Xiaoqian Zhang, Weiqi Luo, Guoqiang Zeng +4 more·Sep 17, 2018
Abstract In blind quantum computation (BQC), a client delegates her quantum computation to a server with universal quantum computers who learns nothing about the client’s private information. In measurement-based BQC model, entangled states are gener...
Gate-Efficient Simulation of Molecular Eigenstates on a Quantum Computer
M. Ganzhorn, D. Egger, P. Barkoutsos +8 more·Sep 13, 2018
A key requirement to perform simulations of large quantum systems on near-term quantum hardware is the design of quantum algorithms with short circuit depth that finish within the available coherence time. A way to stay within the limits of coherence...
A controlled-NOT gate for frequency-bin qubits
Hsuan-Hao Lu, J. Lukens, B. Williams +4 more·Sep 13, 2018
The realization of strong photon–photon interactions has presented an enduring challenge across photonics, particularly in quantum computing, where two-photon gates form essential components for scalable quantum information processing (QIP). While li...
Production of photonic universal quantum gates enhanced by machine learning
K. Sabapathy, H. Qi, J. Izaac +1 more·Sep 12, 2018
We introduce photonic architectures for universal quantum computation. The first step is to produce a resource state which is a superposition of the first four Fock states with a probability $\geq 10^{-2}$, an increase by a factor of $10^4$ over stan...
Qubit Coupled Cluster Method: A Systematic Approach to Quantum Chemistry on a Quantum Computer.
I. G. Ryabinkin, Tzu-Ching Yen, Scott N. Genin +1 more·Sep 11, 2018
A unitary coupled cluster (UCC) form for the wave function in the variational quantum eigensolver has been suggested as a systematic way to go beyond the mean-field approximation and include electron correlation in solving quantum chemistry problems ...
Quantum simulation and optimization in hot quantum networks
M. Schuetz, B. Vermersch, G. Kirchmair +4 more·Sep 11, 2018
We propose a setup based on (solid-state) qubits coupled to a common multimode transmission line, which allows for coherent spin-spin interactions over macroscopic on-chip distances, without any ground-state cooling requirements for the data bus. Our...
Qiskit Backend Specifications for OpenQASM and OpenPulse Experiments
D. McKay, Thomas Alexander, Luciano Bello +17 more·Sep 10, 2018
As interest in quantum computing grows, there is a pressing need for standardized API's so that algorithm designers, circuit designers, and physicists can be provided a common reference frame for designing, executing, and optimizing experiments. Ther...
Quantum algorithm for nonhomogeneous linear partial differential equations
J. Arrazola, Timjan Kalajdzievski, C. Weedbrook +1 more·Sep 8, 2018
We describe a quantum algorithm for preparing states that encode solutions of non-homogeneous linear partial differential equations. The algorithm is a continuous-variable version of matrix inversion: it efficiently inverts differential operators tha...
Tackling the Qubit Mapping Problem for NISQ-Era Quantum Devices
Gushu Li, Yufei Ding, Yuan Xie·Sep 7, 2018
Due to little considerations in the hardware constraints, e.g., limited connections between physical qubits to enable two-qubit gates, most quantum algorithms cannot be directly executed on the Noisy Intermediate-Scale Quantum (NISQ) devices. Dynamic...
A Comparison of the Bravyi–Kitaev and Jordan–Wigner Transformations for the Quantum Simulation of Quantum Chemistry
A. Tranter, P. Love, F. Mintert +1 more·Sep 6, 2018
The ability to perform classically intractable electronic structure calculations is often cited as one of the principal applications of quantum computing. A great deal of theoretical algorithmic development has been performed in support of this goal....
Quantum algorithms and approximating polynomials for composed functions with shared inputs
Mark Bun, Robin Kothari, J. Thaler·Sep 6, 2018
<jats:p>We give new quantum algorithms for evaluating composed functions whose inputs may be shared between bottom-level gates. Let <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>f</mml:mi></mml:math> be an <mml:math xmlns:mml="http...
Accurate Quantum Logic Gates by Spin Echo in Rydberg Atoms
Xiao-Feng Shi·Sep 5, 2018
Scalable quantum computing is based on realizable accurate quantum gates. For neutral atoms, it is an outstanding challenge to design a high-fidelity two-qubit entangling gate without resorting to difficult techniques like shaping laser pulses or coo...