Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Strategies for quantum computing molecular energies using the unitary coupled cluster ansatz
J. Romero, R. Babbush, J. McClean +3 more·Jan 10, 2017
The variational quantum eigensolver (VQE) algorithm combines the ability of quantum computers to efficiently compute expectation values with a classical optimization routine in order to approximate ground state energies of quantum systems. In this pa...
Geometric algebra and information geometry for quantum computational software
C. Cafaro·Jan 10, 2017
The art of quantum algorithm design is highly nontrivial. Grover’s search algorithm constitutes a masterpiece of quantum computational software. In this article, we use methods of geometric algebra (GA) and information geometry (IG) to enhance the al...
Comparison of memory thresholds for planar qudit geometries
Jacob A. Marks, Tomas Jochym-O'Connor, Vlad Gheorghiu·Jan 9, 2017
We introduce and analyze a new type of decoding algorithm called general color clustering, based on renormalization group methods, to be used in qudit color codes. The performance of this decoder is analyzed under a generalized bit-flip error model, ...
Optimal quantum state discrimination via nested binary measurements
M. Rosati, G. Palma, A. Mari +1 more·Jan 9, 2017
A method to compute the optimal success probability of discrimination of N arbitrary quantum states is presented, based on the decomposition of any N-outcome measurement into sequences of nested two-outcome ones. In this way the optimization of the m...
A Quantum Algorithm for Testing Juntas in Boolean Functions
Khaled El-Wazan, A. Younes, S. Doma·Jan 9, 2017
Given a Boolean function $f$ provided as a black-box with $n$ variables, this paper will propose a quantum algorithm for testing if a certain variable is junta or $\epsilon$-far from being junta. The proposed algorithm constructs another black-box us...
Minimization of Quantum Circuits using Quantum Operator Forms
M. Lukac, M. Kameyama, M. Perkowski +1 more·Jan 8, 2017
In this paper we present a method for minimizing reversible quantum circuits using the Quantum Operator Form (QOF); a new representation of quantum circuit and of quantum-realized reversible circuits based on the CNOT, CV and CV$^\dagger$ quantum gat...
Optimized cross-resonance gate for coupled transmon systems
S. Kirchhoff, T. Keßler, Per J. Liebermann +4 more·Jan 7, 2017
The cross-resonant gate is an entangling gate for fixed frequency superconducting qubits introduced for untunable qubits. While being simple and extensible, it suffers from long duration and limited fidelity. Using two different optimal control algor...
In situ upgrade of quantum simulators to universal computers
B. Dive, Alexander Pitchford, F. Mintert +1 more·Jan 6, 2017
Quantum simulators, machines that can replicate the dynamics of quantum systems, are being built as useful devices and are seen as a stepping stone to universal quantum computers. A key difference between the two is that computers have the ability to...
Advantages of Unfair Quantum Ground-State Sampling
B. Zhang, G. Wagenbreth, V. Martín-Mayor +1 more·Jan 6, 2017
The debate around the potential superiority of quantum annealers over their classical counterparts has been ongoing since the inception of the field. Recent technological breakthroughs, which have led to the manufacture of experimental prototypes of ...
Practical optimization for hybrid quantum-classical algorithms
G. Guerreschi, M. Smelyanskiy·Jan 5, 2017
A novel class of hybrid quantum-classical algorithms based on the variational approach have recently emerged from separate proposals addressing, for example, quantum chemistry and combinatorial problems. These algorithms provide an approximate soluti...
Enhancing quantum control by bootstrapping a quantum processor of 12 qubits
Dawei Lu, Keren Li, Jun Li +10 more·Jan 5, 2017
Accurate and efficient control of quantum systems is one of the central challenges for quantum information processing. Current state-of-the-art experiments rarely go beyond 10 qubits and in most cases demonstrate only limited control. Here we demonst...
Coherent long-distance displacement of individual electron spins
H. Flentje, H. Flentje, P. Mortemousque +9 more·Jan 5, 2017
Controlling nanocircuits at the single electron spin level is a possible route for large-scale quantum information processing. In this context, individual electron spins have been identified as versatile quantum information carriers to interconnect d...
Quantum search on the two-dimensional lattice using the staggered model with Hamiltonians
R. Portugal, Tharso D. Fernandes·Jan 5, 2017
Quantum search on the two-dimensional lattice with one marked vertex and cyclic boundary conditions is an important problem in the context of quantum algorithms with an interesting unfolding. It avails to test the ability of quantum walk models to pr...
Entanglement renormalization, quantum error correction, and bulk causality
Isaac H. Kim, M. Kastoryano·Dec 31, 2016
Entanglement renormalization can be viewed as an encoding circuit for a family of approximate quantum error correcting codes. The logical information becomes progres-sively more well-protected against erasure errors at larger length scales. In partic...
Construction of optimal resources for concatenated quantum protocols
A. Pirker, Julius Wallnofer, H. Briegel +1 more·Dec 30, 2016
We present a general framework for the explicit construction of resource states for measurement-based quantum information processing. In particular, we show how to obtain resource states of minimal size for complex tasks that are combinations or conc...
Fast microwave-driven three-qubit gates for cavity-coupled superconducting qubits
Edwin Barnes, C. Arenz, Alexander Pitchford +1 more·Dec 30, 2016
Although single and two-qubit gates are sufficient for universal quantum computation, single-shot three-qubit gates greatly simplify quantum error correction schemes and algorithms. We design fast, high-fidelity three-qubit entangling gates based on ...
Solutions to the mean king's problem: higher-dimensional quantum error-correcting codes
Masakazu Yoshida, Toru Kuriyama, Jun Cheng·Dec 27, 2016
Mean king's problem is a kind of quantum state discrimination problems. In the problem, we try to discriminate eigenstates of noncommutative observables with the help of classical delayed information. The problem has been investigated from the viewpo...
Properties of Unshunted and Resistively Shunted Nb/AlOx-Al/Nb Josephson Junctions With Critical Current Densities From 0.1 to 1 mA/μm2
S. K. Tolpygo, V. Bolkhovsky, S. Zarr +5 more·Dec 26, 2016
We investigated current–voltage characteristics of unshunted and externally shunted Josephson junctions (JJs) with high critical current densities <italic>J</italic><sub>c</sub> in order to extract their basic parameters and statistical characteristi...
Scalable Quantum Circuit and Control for a Superconducting Surface Code
R. Versluis, R. Versluis, S. Poletto +8 more·Dec 24, 2016
We present a scalable scheme for executing the error-correction cycle of a monolithic surface-code fabric composed of fast-flux-tunable transmon qubits with nearest-neighbor coupling. An eight-qubit unit cell forms the basis for repeating both the qu...
Theoretical Evaluation of [VIV(α-C3S5)3]2- as Nuclear-Spin-Sensitive Single-Molecule Spin Transistor.
S. Cardona-Serra, A. Gaita-Ariño, M. Stamenova +1 more·Dec 23, 2016
In a straightforward application of molecular nanospintronics to quantum computing, single-molecule spin transistors can be used to measure nuclear spin qubits. Conductance jumps accompany electronic spin flips at the so-called anticrossings between ...