Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Classical simulation of noncontextual Pauli Hamiltonians
William M. Kirby, P. Love·Feb 13, 2020
Noncontextual Pauli Hamiltonians decompose into sets of Pauli terms to which joint values may be assigned without contradiction. We construct a quasi-quantized model for noncontextual Pauli Hamiltonians. Using this model, we give an algorithm to clas...
Beyond Single-Shot Fault-Tolerant Quantum Error Correction
Nicolas Delfosse, B. Reichardt, K. Svore·Feb 12, 2020
Extensive quantum error correction is necessary in order to perform a useful computation on a noisy quantum computer. Moreover, quantum error correction must be implemented based on imperfect parity check measurements that may return incorrect outcom...
Algorithm for tailoring a quadratic lattice with a local squeezed reservoir to stabilize generic chiral states with nonlocal entanglement
Y. Yanay·Feb 12, 2020
We demonstrate a new approach to the generation of custom entangled many-body states through reservoir engineering, using the symmetry properties of bosonic lattice systems coupled to a local squeezed reservoir. We outline an algorithm where, beginni...
Improved Classical and Quantum Algorithms for Subset-Sum
X. Bonnetain, Rémi Bricout, A. Schrottenloher +1 more·Feb 12, 2020
We present new classical and quantum algorithms for solving random subset-sum instances. First, we improve over the Becker-Coron-Joux algorithm (EUROCRYPT 2011) from $\tilde{\mathcal{O}}(2^{0.291 n})$ downto $\tilde{\mathcal{O}}(2^{0.283 n})$, using ...
Identification of Symmetry-Protected Topological States on Noisy Quantum Computers.
Daniel Azses, R. Haenel, Y. Naveh +3 more·Feb 11, 2020
Identifying topological properties is a major challenge because, by definition, topological states do not have a local order parameter. While a generic solution to this challenge is not available yet, a broad class of topological states, namely, symm...
Reinforcement learning enhanced quantum-inspired algorithm for combinatorial optimization
D. Beloborodov, Alexander Ulanov, Jakob N. Foerster +3 more·Feb 11, 2020
Quantum hardware and quantum-inspired algorithms are becoming increasingly popular for combinatorial optimization. However, these algorithms may require careful hyperparameter tuning for each problem instance. We use a reinforcement learning agent in...
Efficient-sideband-cooling protocol for long trapped-ion chains
J.-S. Chen, K. Wright, N. Pisenti +5 more·Feb 10, 2020
Trapped ions are a promising candidate for large scale quantum computation. Several systems have been built in both academic and industrial settings to implement modestly-sized quantum algorithms. Efficient cooling of the motional degrees of freedom ...
Quantum simulation of quantum field theory in the light-front formulation
Michael Kreshchuk, William M. Kirby, G. Goldstein +2 more·Feb 10, 2020
We develop quantum simulation algorithms based on the light-front formulation of relativistic quantum field theories. We analyze a simple theory in $1+1D$ and show how to compute the analogues of parton distribution functions of composite particles i...
General quantum Bernoulli factory: framework analysis and experiments
Yong Liu, Jiaqing Jiang, Pingyu Zhu +13 more·Feb 8, 2020
The unremitting pursuit for quantum advantages gives rise to the discovery of a quantum-enhanced randomness processing named quantum Bernoulli factory (QBF). This quantum enhanced process can show its priority over the corresponding classical process...
Discretizing quantum field theories for quantum simulation
Terry Farrelly, Julie Streich·Feb 7, 2020
To date, all proposed quantum algorithms for simulating quantum field theory (QFT) simulate (continuous-time) Hamiltonian lattice QFT as a stepping stone. Two overlooked issues are how large we can take the timestep in these simulations while getting...
Quantum Image Processing: the truth, the whole truth, and nothing but the truth about its problems on internal image representation and outcomes recovering
Mario Mastriani·Feb 6, 2020
In this paper, three techniques of internal image-representation in a quantum computer are compared: Flexible Representation of Quantum Images (FRQI), Novel Enhanced Quantum Representation of digital images (NEQR), and Quantum Boolean Image Processin...
Quantum walks and Dirac cellular automata on a programmable trapped-ion quantum computer
C. H. Alderete, Shivani Singh, N. Nguyen +5 more·Feb 6, 2020
The quantum walk formalism is a widely used and highly successful framework for modeling quantum systems, such as simulations of the Dirac equation, different dynamics in both the low and high energy regime, and for developing a wide range of quantum...
Rigorous measurement error correction
M. Geller·Feb 4, 2020
We review an experimental technique used to correct state preparation and measurement errors on gate-based quantum computers, and discuss its rigorous justification. Within a specific biased quantum measurement model, we prove that nonideal measureme...
Experimental quantum conference key agreement
Massimiliano Proietti, Joseph Ho, F. Grasselli +3 more·Feb 4, 2020
When Alice and Bob invite their friends, quantum key distribution with multiparty entanglement enables secure conference call. Quantum networks will provide multinode entanglement enabling secure communication on a global scale. Traditional quantum c...
Policy Gradient based Quantum Approximate Optimization Algorithm
Jiahao Yao, Marin Bukov, Lin Lin·Feb 4, 2020
The quantum approximate optimization algorithm (QAOA), as a hybrid quantum/classical algorithm, has received much interest recently. QAOA can also be viewed as a variational ansatz for quantum control. However, its direct application to emergent quan...
Optimisation of diamond quantum processors
YunHeng Chen, Sophie Stearn, Scott Vella +2 more·Feb 3, 2020
Diamond quantum processors consisting of a nitrogen-vacancy centre and surrounding nuclear spins have been the key to significant advancements in room-temperature quantum computing, quantum sensing and microscopy. The optimisation of these processors...
Lattice Gauge Theory for a Quantum Computer
R. Brower, D. Berenstein, H. Kawai·Feb 2, 2020
The quantum link~\cite{Brower:1997ha} Hamiltonian was introduced two decades ago as an alternative to Wilson's Euclidean lattice QCD with gauge fields represented by bi-linear fermion/anti-fermion operators. When generalized this new microscopic repr...
Solving Vehicle Routing Problem Using Quantum Approximate Optimization Algorithm
Utkarsh Azad, B. K. Behera, Emad A. Ahmed +2 more·Feb 2, 2020
Intelligent transportation systems (ITS) are a critical component of Industry 4.0 and 5.0, particularly having applications in logistic management. One of their crucial utilization is in supply-chain management and scheduling for optimally routing tr...
Local vibrational modes of Si vacancy spin qubits in SiC
Z. Shang, A. Hashemi, Y. Berencén +6 more·Feb 1, 2020
Silicon carbide is a very promising platform for quantum applications because of the extraordinary spin and optical properties of point defects in this technologically friendly material. These properties are strongly influenced by crystal vibrations,...
Quantum algorithm for matrix functions by Cauchy's integral formula
S. Takahira, A. Ohashi, T. Sogabe +1 more·Feb 1, 2020
For matrix A, vector b and function f, the computation of vector f(A)b arises in many scientific computing applications. We consider the problem of obtaining quantum state |f> corresponding to vector f(A)b. There is a quantum algorithm to compute sta...