Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
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...
Correlating the nanostructure of Al-oxide with deposition conditions and dielectric contributions of two-level systems in perspective of superconducting quantum circuits
S. Fritz, A. Seiler, L. Radtke +5 more·Dec 5, 2017
This work is concerned with Al/Al-oxide(AlOx)/Al-layer systems which are important for Josephson-junction-based superconducting devices such as quantum bits. The device performance is limited by noise, which has been to a large degree assigned to the...
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 Clique Gossiping
Bo Li, Shuang Li, Junfeng Wu +1 more·Dec 4, 2017
This paper establishes a framework of quantum clique gossiping by introducing local clique operations to networks of interconnected qubits. Cliques are local structures in complex networks being complete subgraphs, which can be used to accelerate cla...
A path to AI
Ion Dronic·Dec 4, 2017
To build a safe system that would replicate and perhaps transcend human-level intelligence, a system composed of three basic modules: objective, agent, and perception is proposed for development. An objective module would make sure the system acts in...
Machine Learning for Predictive Estimation of Qubit Dynamics Subject to Dephasing
R. Gupta, M. Biercuk·Dec 4, 2017
Decoherence remains a major challenge in quantum computing hardware and a variety of physical-layer controls provide opportunities to mitigate the impact of this phenomenon through feedback and feedforward control. In this work, we compare a variety ...
Andreev levels as a first approach to quantum computing with high Tc superconductors
M. Morgado, C. Ladera·Dec 4, 2017
A computing platform based on low temperature superconductors (LTS) has already been proven both theoretically and experimentally. However, qubits based on high Tc superconductors (HTS) are not yet well understood. Here we study the Andreev bounds st...
The BBGKY hierarchy for ultracold bosonic systems
S. Kronke, P. Schmelcher·Dec 3, 2017
We establish a theoretical framework for exploring the quantum dynamics of finite ultracold bosonic ensembles based on the Born-Bogoliubov-Green-Kirkwood-Yvon (BBGKY) hierarchy of equations of motion for few-particle reduced density matrices (RDMs). ...
Demonstration of entanglement purification and swapping protocol to design quantum repeater in IBM quantum computer
B. K. Behera, Swarnadeep Seth, Antariksha Das +1 more·Dec 3, 2017
Quantum communication is a secure way to transfer quantum information and to communicate with legitimate parties over distant places in a network. Although communication over a long distance has already been attained, technical problem arises due to ...
High-threshold fault-tolerant quantum computation with analog quantum error correction
Kosuke Fukui, A. Tomita, A. Okamoto +1 more·Dec 1, 2017
To implement fault-tolerant quantum computation with continuous variables, the Gottesman-Kitaev-Preskill (GKP) qubit has been recognized as an important technological element. However,it is still challenging to experimentally generate the GKP qubit w...
Bravyi-Kitaev Superfast simulation of electronic structure on a quantum computer.
Kanav Setia, J. Whitfield·Dec 1, 2017
Present quantum computers often work with distinguishable qubits as their computational units. In order to simulate indistinguishable fermionic particles, it is first required to map the fermionic state to the state of the qubits. The Bravyi-Kitaev S...
Robust Learning Control Design for Quantum Unitary Transformations
Chengzhi Wu, B. Qi, Chunlin Chen +1 more·Dec 1, 2017
Robust control design for quantum unitary transformations has been recognized as a fundamental and challenging task in the development of quantum information processing due to unavoidable decoherence or operational errors in the experimental implemen...
Analysing correlated noise on the surface code using adaptive decoding algorithms
Naomi H. Nickerson, Benjamin J. Brown·Dec 1, 2017
Laboratory hardware is rapidly progressing towards a state where quantum error-correcting codes can be realised. As such, we must learn how to deal with the complex nature of the noise that may occur in real physical systems. Single qubit Pauli error...
Experimental Demonstration of Quantum Tunneling in IBM Quantum Computer
Narendra N. Hegade, Nachiket L. Kortikar, Bikramaditya Das +2 more·Dec 1, 2017
Quantum computers are the promising candidates for simulation of large quantum systems, which is a daunting task to perform in a classical computer. Here we report the experimental realization of quantum tunneling of a single particle through differe...
Generalization of Quantum Fourier Transformation
Changpeng Shao·Dec 1, 2017
Quantum Fourier transformation is important in many quantum algorithms. In this paper, we generalize quantum Fourier transformation over the Abelian group $\mathbb{Z}_N$ from two different points to get more efficient unitary transformations. The obt...
All-electrical universal control of a double quantum dot qubit in silicon MOS
P. Harvey-Collard, R. Jock, N. Jacobson +12 more·Dec 1, 2017
Qubits based on transistor-like Si MOS nanodevices are promising for quantum computing. In this work, we demonstrate a double quantum dot spin qubit that is all-electrically controlled without the need for any external components, like micromagnets, ...
Element distinctness revisited
R. Portugal·Nov 30, 2017
The element distinctness problem is the problem of determining whether the elements of a list are distinct, that is, if $$x=(x_1,\ldots ,x_N)$$x=(x1,…,xN) is a list with N elements, we ask whether the elements of x are distinct or not. The solution i...
Quantum Neuron: an elementary building block for machine learning on quantum computers
Yudong Cao, G. Guerreschi, Alán Aspuru-Guzik·Nov 30, 2017
Even the most sophisticated artificial neural networks are built by aggregating substantially identical units called neurons. A neuron receives multiple signals, internally combines them, and applies a non-linear function to the resulting weighted su...
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...