Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Multimode superconducting circuits for realizing strongly coupled multiqubit processor units
Tanay Roy, M. Chand, A. Bhattacharjee +4 more·Nov 5, 2017
Inter-qubit coupling and qubit connectivity in a processor are crucial for achieving high fidelity multi-qubit gates and efficient implementation of quantum algorithms. Typical superconducting processors employ relatively weak transverse inter-qubit ...
Online scheduled execution of quantum circuits protected by surface codes
A. Paler, A. Fowler, R. Wille·Nov 4, 2017
Quantum circuits are the preferred formalism for expressing quantum information processing tasks. Quantum circuit design automation methods mostly use a waterfall approach and consider that high level circuit descriptions are hardware agnostic. This ...
Universal quantum computing using (Z d ) 3 symmetry-protected topologically ordered states
Yanzhu Chen, A. Prakash, T. Wei·Oct 31, 2017
Measurement-based quantum computation describes a scheme where entanglement of resource states is utilized to simulate arbitrary quantum gates via local measurements. Recent works suggest that symmetry-protected topologically non-trivial, short-range...
Quantum criticality and state engineering in the simulated anisotropic quantum Rabi model
Yimin Wang, W. You, Maoxin Liu +4 more·Oct 24, 2017
Promising applications of the anisotropic quantum Rabi model (AQRM) in broad parameter ranges are explored, which is realized with superconducting flux qubits simultaneously driven by two-tone time-dependent magnetic fields. Regarding the quantum pha...
Automated optimization of large quantum circuits with continuous parameters
Y. Nam, N. J. Ross, Yuan Su +2 more·Oct 19, 2017
We develop and implement automated methods for optimizing quantum circuits of the size and type expected in quantum computations that outperform classical computers. We show how to handle continuous gate parameters and report a collection of fast alg...
Benchmarking non-simulable quantum processes via symmetry conservation
T. Chasseur, F. Motzoi, Michael P. Kaicher +2 more·Oct 12, 2017
As quantum devices scale up, many-body quantum gates and algorithms begin to surpass what is possible to simulate classically. Validation methods which rely on such classical simulation, such as process tomography and randomized benchmarking, cannot ...
Adiabatic passage of radio-frequency-assisted Förster resonances in Rydberg atoms for two-qubit gates and the generation of Bell states
I. Beterov, G. Hamzina, E. Yakshina +3 more·Oct 12, 2017
High-fidelity entangled Bell states are of great interest in quantum physics. Entanglement of ultracold neutral atoms in two spatially separated optical dipole traps is promising for implementation of quantum computing and quantum simulation and for ...
Optimal control of hybrid qubits: Implementing the quantum permutation algorithm
C. M. Rivera-Ruiz, E. Lima, F. Fanchini +2 more·Oct 11, 2017
The optimal quantum control theory is employed to determine electric pulses capable of producing quantum gates with high fidelity (higher than 0.9997). Particularly, these quantum gates were chosen to perform the permutation algorithm (Z. Gedik et al...
Programmable and scalable radio-frequency pulse sequence generator for multi-qubit quantum information experiments
B. Keitch, V. Negnevitsky, Weida Zhang·Oct 11, 2017
We present a versatile rf pulse control system that has been designed for multi-qubit quantum experiments. One instrument can be scaled to provide 32 channels of rf between 10 - 450 MHz. Synchronization can be achieved across multiple instruments. By...
Physical realization of topological quantum walks on IBM-Q and beyond
R. Balu, Daniel Castillo, G. Siopsis·Oct 10, 2017
We discuss an efficient physical realization of topological quantum walks on a one-dimensional finite lattice with periodic boundary conditions (circle). The N-point lattice is realized with log 2 N qubits, and the quantum circuit utilizes a number o...
Exponential Quantum Speed-ups for Semidefinite Programming with Applications to Quantum Learning
F. Brandão, A. Kalev, Tongyang Li +3 more·Oct 6, 2017
We give semidefinite program (SDP) quantum solvers with an exponential speed-up over classical ones. Specifically, we consider SDP instances with $m$ constraint matrices of dimension $n$, each of rank at most $r$, and assume that the input matrices o...
Deutsch, Toffoli, and CNOT gates via Rydberg blockade of neutral atoms
Xiao-Feng Shi·Oct 5, 2017
Universal quantum gates and quantum error correction~(QEC) lie in the heart of quantum information science. Large-scale quantum computing depends on a universal set of quantum gates, in which some gates may be easily carried out, while others are har...
Simulating the performance of a distance-3 surface code in a linear ion trap
Colin J. Trout, Muyuan Li, Mauricio Gutiérrez +4 more·Oct 3, 2017
We explore the feasibility of implementing a small surface code with 9 data qubits and 8 ancilla qubits, commonly referred to as surface-17, using a linear chain of 171Yb+ ions. Two-qubit gates can be performed between any two ions in the chain with ...
Ground States via Spectral Combing on a Quantum Computer
D. Kaplan, N. Klco, A. Roggero·Sep 24, 2017
A new method is proposed for determining the ground state wave function of a quantum many-body system on a quantum computer, without requiring an initial trial wave function that has good overlap with the true ground state. The technique of Spectral ...
Fast quantum logic gates with trapped-ion qubits
V. M. Schäfer, C. Ballance, K. Thirumalai +4 more·Sep 20, 2017
Quantum bits (qubits) based on individual trapped atomic ions are a promising technology for building a quantum computer. The elementary operations necessary to do so have been achieved with the required precision for some error-correction schemes. H...
Gate-error analysis in simulations of quantum computers with transmon qubits
D. Willsch, Madita Nocon, F. Jin +3 more·Sep 19, 2017
In the model of gate-based quantum computation, the qubits are controlled by a sequence of quantum gates. In superconducting qubit systems, these gates can be implemented by voltage pulses. The success of implementing a particular gate can be express...
Halving the cost of quantum addition
C. Gidney·Sep 19, 2017
We improve the number of T gates needed to perform an n-bit adder from 8n+O(1) to 4n+O(1). We do so via a "temporary logical-AND" construction which uses four T gates to store the logical-AND of two qubits into an ancilla and zero T gates to later er...
A CNOT gate between multiphoton qubits encoded in two cavities
Serge Rosenblum, Yvonne Y Gao, P. Reinhold +8 more·Sep 15, 2017
Entangling gates between qubits are a crucial component for performing algorithms in quantum computers. However, any quantum algorithm must ultimately operate on error-protected logical qubits encoded in high-dimensional systems. Typically, logical q...
Entropy Control Architectures for Next-Generation Supercomputers
J. Uhlmann·Sep 5, 2017
Progress in high-performance computing (HPC) fundamentally requires effective thermal dissipation. At present this challenge is viewed in terms of two distinct architectural components: a computational substrate and a heat-exchange substrate. Typical...
Quantum simulation from the bottom up: the case of rebits
Dax Enshan Koh, M. Niu, Theodore J. Yoder·Aug 30, 2017
Typically, quantum mechanics is thought of as a linear theory with unitary evolution governed by the Schrödinger equation. While this is technically true and useful for a physicist, with regards to computation it is an unfortunately narrow point of v...