Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Deterministic Remote Entanglement of Superconducting Circuits through Microwave Two-Photon Transitions.
P. Campagne-Ibarcq, E. Zalys-Geller, A. Narla +8 more·Dec 15, 2017
Large-scale quantum information processing networks will most probably require the entanglement of distant systems that do not interact directly. This can be done by performing entangling gates between standing information carriers, used as memories ...
Simulation of low-depth quantum circuits as complex undirected graphical models
S. Boixo, S. Isakov, V. Smelyanskiy +1 more·Dec 14, 2017
Near term quantum computers with a high quantity (around 50) and quality (around 0.995 fidelity for two-qubit gates) of qubits will approximately sample from certain probability distributions beyond the capabilities of known classical algorithms on s...
An Efficient Methodology for Mapping Quantum Circuits to the IBM QX Architectures
Alwin Zulehner, A. Paler, R. Wille·Dec 13, 2017
In the past years, quantum computers more and more have evolved from an academic idea to an upcoming reality. IBM’s project IBM ${Q}$ can be seen as evidence of this progress. Launched in March 2017 with the goal to provide access to quantum computer...
Measuring and Suppressing Error Correlations in Quantum Circuits
C. Edmunds, Cornelius Hempel, R. Harris +4 more·Dec 13, 2017
Quantum error correction provides a path to large-scale quantum computers, but is built on challenging assumptions about the characteristics of the underlying errors. In particular, the mathematical assumption of independent errors in quantum logic o...
Machine learning techniques for state recognition and auto-tuning in quantum dots
Sandesh S. Kalantre, J. P. Zwolak, Stephen Ragole +4 more·Dec 13, 2017
Recent progress in building large-scale quantum devices for exploring quantum computing and simulation has relied upon effective tools for achieving and maintaining good experimental parameters, i.e., tuning up devices. In many cases, including quant...
Majorana-Based Fermionic Quantum Computation.
T. O’Brien, P. Rożek, A. Akhmerov·Dec 6, 2017
Because Majorana zero modes store quantum information nonlocally, they are protected from noise, and have been proposed as a building block for a quantum computer. We show how to use the same protection from noise to implement universal fermionic qua...
On the controlled-NOT complexity of controlled-NOT–phase circuits
M. Amy, Parsiad Azimzadeh, M. Mosca·Dec 5, 2017
We study the problem of CNOT -optimal quantum circuit synthesis over gate sets consisting of CNOT and Z-basis rotations of arbitrary angles. We show that the circuit-polynomial correspondence relates such circuits to Fourier expansions of pseudo-Bool...
An efficient quantum compiler that reduces T count
Luke E Heyfron, E. Campbell·Dec 5, 2017
Before executing a quantum algorithm, one must first decompose the algorithm into machine-level instructions compatible with the architecture of the quantum computer, a process known as quantum compiling. There are many different quantum circuit deco...
Quantum Algorithm for Spectral Measurement with a Lower Gate Count.
D. Poulin, A. Kitaev, Damian S. Steiger +2 more·Nov 29, 2017
We present two techniques that can greatly reduce the number of gates required to realize an energy measurement, with application to ground state preparation in quantum simulations. The first technique realizes that to prepare the ground state of som...
Toward the first quantum simulation with quantum speedup
Andrew M. Childs, D. Maslov, Y. Nam +2 more·Nov 29, 2017
Significance Near-term quantum computers will have limited numbers of qubits and will only be able to reliably perform limited numbers of gates. Therefore, it is crucial to identify applications of quantum processors that use the fewest possible reso...
Merlin-Arthur with efficient quantum Merlin and quantum supremacy for the second level of the Fourier hierarchy
T. Morimae, Yuki Takeuchi, H. Nishimura·Nov 28, 2017
We introduce a simple sub-universal quantum computing model, which we call the Hadamard-classical circuit with one-qubit (HC1Q) model. It consists of a classical reversible circuit sandwiched by two layers of Hadamard gates, and therefore it is in th...
One-way quantum computing in superconducting circuits
F. Albarr'an-Arriagada, G. A. Barrios, M. Sanz +4 more·Nov 28, 2017
We propose a method for the implementation of one-way quantum computing in superconducting circuits. Measurement-based quantum computing is a universal quantum computation paradigm in which an initial cluster-state provides the quantum resource, whil...
A Quantum Circuit to Construct All Maximal Cliques Using Grover Search Algorithm
C. Wie·Nov 16, 2017
A quantum circuit to construct all maximal cliques using Grover search algorithm is presented. This oracle circuit takes as input an n-qubit state |x> and the adjacency matrix data A of an n-node network, and outputs the state (-1)^f(x) |x> where f(x...
Quantum algorithms to simulate many-body physics of correlated fermions.
Zhang Jiang, Kevin J Sung, K. Kechedzhi +2 more·Nov 15, 2017
Simulating strongly correlated fermionic systems is notoriously hard on classical computers. An alternative approach, as proposed by Feynman, is to use a quantum computer. Here, we discuss quantum simulation of strongly correlated fermionic systems. ...
Quantum Simulation of Electronic Structure with Linear Depth and Connectivity.
I. Kivlichan, J. McClean, N. Wiebe +4 more·Nov 13, 2017
As physical implementations of quantum architectures emerge, it is increasingly important to consider the cost of algorithms for practical connectivities between qubits. We show that by using an arrangement of gates that we term the fermionic swap ne...
A small quantum computer is needed to optimize fault-tolerant protocols
Pavithran Iyer, D. Poulin·Nov 13, 2017
As far as we know, a useful quantum computer will require fault-tolerant gates, and existing schemes demand a prohibitively large space and time overhead. We argue that a first generation quantum computer will be very valuable to design, test, and op...
A crossbar network for silicon quantum dot qubits
Ruoyu Li, L. Petit, D. P. Franke +10 more·Nov 10, 2017
Quantum dots take a shortcut toward practical quantum information. The spin states of single electrons in gate-defined quantum dots satisfy crucial requirements for a practical quantum computer. These include extremely long coherence times, high-fide...
Faster quantum algorithm to simulate fermionic quantum field theory
A. Moosavian, S. Jordan·Nov 10, 2017
In quantum algorithms discovered so far for simulating scattering processes in quantum field theories, state preparation is the slowest step. We present a new algorithm for preparing particle states to use in simulation of Fermionic Quantum Field The...
Emergence of non-abelian gauge theories and the ER-EPR duality
A. Patrascu·Nov 9, 2017
Making use of the emergence of an entangling gate from the Mayer Vietoris maps generating a torus and employing the correspondence between quantum error correction codes and gauge symmetries I show that non-abelian gauge theories are related to the e...
Crosstalk error correction through dynamical decoupling of single-qubit gates in capacitively coupled singlet-triplet semiconductor spin qubits
Donovan Buterakos, R. Throckmorton, S. Das Sarma·Nov 6, 2017
In addition to magnetic field and electric charge noise adversely affecting spin qubit operations, performing single-qubit gates on one of multiple coupled singlet-triplet qubits presents a new challenge---crosstalk, which is inevitable (and must be ...