Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
WavePacket: A Matlab package for numerical quantum dynamics.II: Open quantum systems, optimal control, and model reduction
B. Schmidt, C. Hartmann·Jul 19, 2017
Abstract WavePacket is an open-source program package for numeric simulations in quantum dynamics. It can solve time-independent or time-dependent linear Schrodinger and Liouville–von Neumann-equations in one or more dimensions. Also coupled equation...
Quantum gate identification: error analysis, numerical results and optical experiment
Yuanlong Wang, Qi Yin, Daoyi Dong +5 more·Jul 19, 2017
The identification of an unknown quantum gate is a significant issue in quantum technology. In this paper, we propose a quantum gate identification method within the framework of quantum process tomography. In this method, a series of pure states are...
Self-guided method to search maximal Bell violations for unknown quantum states
Li-Kai Yang, Geng Chen, Wen-Hao Zhang +4 more·Jul 18, 2017
In recent decades, a great variety of research and applications concerning Bell nonlocality have been developed with the advent of quantum information science. Providing that Bell nonlocality can be revealed by the violation of a family of Bell inequ...
Implicitly disentangled renormalization
G. Evenbly·Jul 18, 2017
We propose a new implementation of real-space renormalization group (RG) transformations for quantum states on a lattice. Key to this approach is the removal of short-ranged entanglement, similar to Vidal's entanglement renormalization (ER), which al...
Versatile relative entropy bounds for quantum networks
L. Rigovacca, L. Rigovacca, G. Kato +5 more·Jul 18, 2017
We provide a versatile upper bound on the number of maximally entangled qubits, or private bits, shared by two parties via a generic adaptive communication protocol over a quantum network when the use of classical communication is not restricted. Alt...
Hamiltonian Simulation by Uniform Spectral Amplification
G. Low, I. Chuang·Jul 17, 2017
The exponential speedups promised by Hamiltonian simulation on a quantum computer depends crucially on structure in both the Hamiltonian $\hat{H}$, and the quantum circuit $\hat{U}$ that encodes its description. In the quest to better approximate tim...
Toward high-fidelity coherent electron spin transport in a GaAs double quantum dot
Xinyu Zhao, Xuedong Hu·Jul 17, 2017
In this paper, we investigate how to achieve high-fidelity electron spin transport in a GaAs double quantum dot. Our study examines fidelity loss in spin transport from multiple perspectives. We first study incoherent fidelity loss due to hyperfine a...
Hardware-efficient fermionic simulation with a cavity–QED system
Guanyu Zhu, Yiğit Subaşı, J. Whitfield +1 more·Jul 15, 2017
In digital quantum simulation of fermionic models with qubits, non-local maps for encoding are often encountered. Such maps require linear or logarithmic overhead in circuit depth which could render the simulation useless, for a given decoherence tim...
Probing many-body dynamics on a 51-atom quantum simulator
H. Bernien, S. Schwartz, A. Keesling +9 more·Jul 13, 2017
Controllable, coherent many-body systems can provide insights into the fundamental properties of quantum matter, enable the realization of new quantum phases and could ultimately lead to computational systems that outperform existing computers based ...
Complete Bell-state analysis for superconducting-quantum-interference-device qubits with a transitionless tracking algorithm
Yi‐Hao Kang, Ye‐Hong Chen, Zhicheng Shi +3 more·Jul 13, 2017
In this paper, we propose a protocol for complete Bell-state analysis for two superconducting-quantum-interference-device qubits. The Bell-state analysis could be completed by using a sequence of microwave pulses designed by the transition- less trac...
Learning stabilizer states by Bell sampling
A. Montanaro·Jul 13, 2017
We show that measuring pairs of qubits in the Bell basis can be used to obtain a simple quantum algorithm for efficiently identifying an unknown stabilizer state of n qubits. The algorithm uses O(n) copies of the input state and fails with exponentia...
Efficient eigenvalue determination for arbitrary Pauli products based on generalized spin-spin interactions
D. Leibfried, D. Wineland·Jul 12, 2017
Abstract Effective spin-spin interactions between qubits enable the determination of the eigenvalue of an arbitrary Pauli product of dimension N with a constant, small number of multi-qubit gates that is independent of N and encodes the eigenvalue in...
Quantum critical environment assisted quantum magnetometer
Noufal Jaseem, S. Omkar, Anil Shaji·Jul 12, 2017
A central qubit coupled to an Ising ring of N qubits, operating close to a critical point is investigated as a potential precision quantum magnetometer for estimating an applied transverse magnetic field. We compute the quantum Fisher information for...
Correlating Thermal Machines and the Second Law at the Nanoscale
Markus P. Mueller·Jul 11, 2017
Thermodynamics at the nanoscale is known to differ significantly from its familiar macroscopic counterpart: the possibility of state transitions is not determined by free energy alone, but by an infinite family of free-energy-like quantities; strong ...
Tapering of femtosecond laser-written waveguides.
R. Heilmann, C. Greganti, M. Gräfe +3 more·Jul 10, 2017
The vast development of integrated quantum photonic technology enables the implementation of compact and stable interferometric networks. In particular, laser-written waveguide structures allow for complex 3D circuits and polarization-encoded qubit m...
Efficient Classical Algorithm for Boson Sampling with Partially Distinguishable Photons.
J. Renema, A. Menssen, William R. Clements +3 more·Jul 10, 2017
We demonstrate how boson sampling with photons of partial distinguishability can be expressed in terms of interference of fewer photons. We use this observation to propose a classical algorithm to simulate the output of a boson sampler fed with photo...
Convex Optimization over Classes of Multiparticle Entanglement.
Jiangwei Shang, O. Gühne·Jul 10, 2017
A well-known strategy to characterize multiparticle entanglement utilizes the notion of stochastic local operations and classical communication (SLOCC), but characterizing the resulting entanglement classes is difficult. Given a multiparticle quantum...
Microwave photonics with superconducting quantum circuits
X. Gu, A. F. Kockum, A. Miranowicz +2 more·Jul 7, 2017
In the past 20 years, impressive progress has been made both experimentally and theoretically in superconducting quantum circuits, which provide a platform for manipulating microwave photons. This emerging field of superconducting quantum microwave c...
Rapid Exponentiation using Discrete Operators: Applications in Optimizing Quantum Controls and Simulating Quantum Dynamics
Gaurav Bhole, T. S. Mahesh·Jul 7, 2017
Matrix exponentiation (ME) is widely used in various fields of science and engineering. For example, the unitary dynamics of quantum systems is described by exponentiation of Hamiltonian operators. However, despite a significant attention, the numeri...
High-dimensional frequency-bin entangled photons in an optical microresonator on a chip
Poolad Imany, J. Jaramillo-Villegas, Ogaga D. Odele +6 more·Jul 7, 2017
Quantum frequency combs from chip-scale integrated sources are promising candidates for scalable and robust quantum information processing (QIP). However, to use these quantum combs for frequency domain QIP, demonstration of entanglement in the frequ...