Papers

You Zhou, Qi Zhao, Xiao Yuan +1 more·Nov 6, 2017

Recently, there are tremendous developments on the number of controllable qubits in several quantum computing systems. For these implementations, it is crucial to determine the entanglement structure of the prepared multipartite quantum state as a ba...

Xiangyu Wang, Yichen Zhang, Song Yu +1 more·Nov 6, 2017

Error correction is a significant step in postprocessing of continuous-variable quantum key distribution system, which is used to make two distant legitimate parties share identical corrected keys. We propose an experiment demonstration of high speed...

J. Arrazola, E. Diamanti, Iordanis Kerenidis·Nov 6, 2017

Demonstrating quantum superiority for some computational task will be a milestone for quantum technologies and would show that computational advantages are possible not only with a universal quantum computer but with simpler physical devices. Linear ...

Xun Gao, Zhengyu Zhang, L. Duan·Nov 6, 2017

A central task in the field of quantum computing is to find applications where quantum computer could provide exponential speedup over any classical computer. Machine learning represents an important field with broad applications where quantum comput...

P. Scarlino, D. V. Woerkom, A. Stockklauser +8 more·Nov 6, 2017

Developing fast and accurate control and readout techniques is an important challenge in quantum information processing with semiconductor qubits. Here, we study the dynamics and the coherence properties of a GaAs/AlGaAs double quantum dot charge qub...

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 ...

B. Kaliski·Nov 5, 2017

A targeted exponentiation algorithm computes a group exponentiation operation $a^k$ with a reversible circuit in such a way that the initial state of the circuit consists of only the base $a$ and fixed values, and the final state consists of only the...

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 ...

Anastasios Kyrillidis, A. Kalev, Dohyung Park +3 more·Nov 4, 2017

With nowadays steadily growing quantum processors, it is required to develop new quantum tomography tools that are tailored for high-dimensional systems. In this work, we describe such a computational tool, based on recent ideas from non-convex optim...

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 ...

Luca Paolini, Luca Roversi, M. Zorzi·Nov 2, 2017

We present IQu, namely a quantum programming language that extends Reynold's Idealized Algol, the paradigmatic core of Algol-like languages. IQu combines imperative programming with high-order features, mediated by a simple type theory. IQu mildly me...

Jayadev Acharya, Ibrahim Issa, Nirmal V. Shende +1 more·Nov 2, 2017

The entropy of a quantum system is a measure of its randomness, and has applications in measuring quantum entanglement. We study the problem of estimating the von Neumann entropy, <inline-formula> <tex-math notation="LaTeX">$S(\rho)$ </tex-math></inl...

S. Kosen, R. Morris, A. V. Loo +1 more·Nov 2, 2017

Hybrid systems combining magnons and superconducting quantum circuits have attracted increasing interest in recent years. Magnonic crystals (MCs) are one of the building blocks of room-temperature magnonics and can be used to create devices with an e...

Huiqin Xie, Li Yang·Nov 2, 2017

In this paper, we study applications of Bernstein–Vazirani algorithm and present several new methods to attack block ciphers. Specifically, we first present a quantum algorithm for finding the linear structures of a function. Based on it, we propose ...

Thomas Wagner, H. Kampermann, D. Bruß·Nov 1, 2017

Graph states have been used to construct quantum error correction codes for independent errors. Hypergraph states generalize graph states, and symmetric hypergraph states have been shown to allow for the correction of correlated errors. In this paper...

András Gilyén, Srinivasan Arunachalam, N. Wiebe·Nov 1, 2017

We consider a generic framework of optimization algorithms based on gradient descent. We develop a quantum algorithm that computes the gradient of a multi-variate real-valued function $f:\mathbb{R}^d\rightarrow \mathbb{R}$ by evaluating it at only a ...

A. Pljonkin, K. Rumyantsev, P. Singh·Oct 31, 2017

In the description of quantum key distribution systems, much attention is paid to the operation of quantum cryptography protocols. The main problem is the insufficient study of the synchronization process of quantum key distribution systems. This pap...

F. Tacchino, A. Chiesa, M. LaHaye +2 more·Oct 31, 2017

Quantum simulators are one of the most appealing applications of a quantum computer. Here we propose a universal, scalable, and integrated quantum computing platform based on tunable qubits encoded in electromechanical nano-oscillators within a super...

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...

Daniel Z. Zanger·Oct 30, 2017

In the SEARCH WITH ADVICE problem, a single entry of interest within a database of N entries is to be found assuming that an ordering of the entries, from that with the highest probability of being the entry of interest (as determined by a so-called ...