Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Unconventional Rydberg pumping and applications in quantum information processing
D. X. Li, X. Shao·Jun 14, 2018
We propose a mechanism of unconventional Rydberg pumping (URP) via simultaneously driving each Rydberg atom by two classical fields with different strengths of Rabi frequencies. This mechanism differs from the general Rydberg blockade or Rydberg anti...
Witnessing Quantum Resource Conversion within Deterministic Quantum Computation Using One Pure Superconducting Qubit.
Wenhe Wang, J. Han, B. Yadin +9 more·Jun 14, 2018
Deterministic quantum computation with one qubit (DQC1) is iconic in highlighting that exponential quantum speedup may be achieved with negligible entanglement. Its discovery catalyzed a heated study of general quantum resources, and various conjectu...
Pre- and post-quantum Diffie-Hellman from groups, actions, and isogenies
Benjamin A. Smith·Jun 14, 2018
Diffie–Hellman key exchange is at the foundations of public-key cryptography, but conventional group-based Diffie–Hellman is vulnerable to Shor’s quantum algorithm. A range of “post-quantum Diffie–Hellman” protocols have been proposed to mitigate thi...
Quantum error correction and entanglement spectrum in tensor networks
Yi Ling, Yuxuan Liu, Zhuo-Yu Xian +1 more·Jun 13, 2018
A sort of planar tensor networks with tensor constraints is investigated as a model for holography. We study the greedy algorithm generated by tensor constraints and propose the notion of critical protection (CP) against the action of greedy algorith...
Quantum Monte Carlo calculations of energy gaps from first principles
R. Hunt, M. Szyniszewski, G. Prayogo +2 more·Jun 12, 2018
We review the use of continuum quantum Monte Carlo (QMC) methods for the calculation of energy gaps from first principles, and present a broad set of excited-state calculations carried out with the variational and fixed-node diffusion QMC methods on ...
Control and Readout Software for Superconducting Quantum Computing
Cheng Guo, Futian Liang, Jin Lin +5 more·Jun 11, 2018
Being important parts of the superconducting quantum computer, the high-speed arbitrary waveform generator (AWG), ultraprecision dc source, and high-speed digitizer are used to manipulate the qubit. The complexity of an experimental setup increases r...
Perfect quantum state transfer in a superconducting qubit chain with parametrically tunable couplings.
Xuegang Li, Yuwei Ma, Jiaxiu Han +8 more·Jun 11, 2018
Faithfully transferring the quantum state is essential for quantum information processing. Here we demonstrate a fast (in 84 ns) and high-fidelity (99.2%) transfer of arbitrary quantum states in a chain of four superconducting qubits with nearest-nei...
When will we have a quantum computer?
M. Dyakonov·Jun 10, 2018
A classical computer with N bits (transistors), has $2^N$ possible states, and the computation process consists in switching on or off certain transistors according to a prescribed program. In contrast, the quantum computer with N qubits (spins) is c...
A note on the security of CSIDH
J. Biasse, Annamaria Iezzi, M. Jacobson·Jun 10, 2018
We propose a quantum algorithm for computing an isogeny between two elliptic curves \(E_1,E_2\) defined over a finite field such that there is an imaginary quadratic order \(\mathcal {O}\) satisfying \(\mathcal {O}\simeq {\text {End}}(E_i)\) for \(i ...
High Performance and Scalable AWG for Superconducting Quantum Computing
Jin Lin, Futian Liang, Yu Xu +4 more·Jun 10, 2018
Superconducting quantum computer is manufactured based on semiconductor process which makes qubits integration possible. At the same time, this kind of qubit exhibits high performance fidelity, de-coherence time, scalability and requires a programmab...
A Unification of the Coding Theory and OAQEC Perspectives on Hybrid Codes
Shayan Majidy·Jun 10, 2018
There is an advantage in simultaneously transmitting both classical and quantum information over a quantum channel compared to sending independent transmissions. The successful implementation of simultaneous transmissions of quantum and classical inf...
Scalable Self-Adaptive Synchronous Triggering System in Superconducting Quantum Computing
Lihua Sun, Futian Liang, Jin Lin +4 more·Jun 10, 2018
Superconducting quantum computers (SQCs) can solve some specific problems which are deeply believed to be intractable for classical computers. One of the key components of SQCs is a high-precision synchronous control system which consists of arbitrar...
Quantum Bit Error Avoidance
A. Shiekh·Jun 9, 2018
Qubit errors might be avoided by using the quantum Zeno effect to inhibit evolution. 1 Errors Errors need to be dealt with and there are two possible approaches to this problem, error correction and error avoidance. 1.1 Digital versus analogue In dig...
Experimental realization of quantum algorithms for a linear system inspired by adiabatic quantum computing
Jingwei Wen, X. Kong, Shijie Wei +3 more·Jun 8, 2018
Adiabatic quantum computation is of fundamental importance in the field of quantum computation as it offers an alternative approach to the gate-based model for the manipulation of quantum systems. Recently, an interesting work [arXiv:1805.10549] indi...
Experimental Realization of Controlled Square Root of Z Gate Using IBM's Cloud Quantum Experience Platform
Petar Nikolov, V. Galabov·Jun 7, 2018
Quantum computers form a technological cluster with huge growth in the last few years. Although this technology is of still very limited size: perhaps the reason it is not seen as a technology which may be mass produced or of public use in the near f...
Quantum simulation of the Sachdev-Ye-Kitaev model by asymmetric qubitization
R. Babbush, D. Berry, H. Neven·Jun 7, 2018
We show that one can quantum simulate the dynamics of a Sachdev-Ye-Kitaev model with $N$ Majorana modes for time $t$ to precision $\epsilon$ with gate complexity $O(N^{7/2} t + N^{5/2} t \,{\rm polylog}(N/ \epsilon))$. In addition to scaling sublinea...
Ultra-precision DC source for Superconducting Quantum Computer
Futian Liang, P. Miao, Jin Lin +6 more·Jun 7, 2018
The Superconducting Quantum Computing (SQC) is one of the most promising quantum computing techniques. The SQC requires precise control and acquisition to operate the superconducting qubits. The ultra-precision DC source is used to provide a DC bias ...
Verified quantum information scrambling
K. Landsman, C. Figgatt, T. Schuster +4 more·Jun 7, 2018
Quantum scrambling is the dispersal of local information into many-body quantum entanglements and correlations distributed throughout an entire system. This concept accompanies the dynamics of thermalization in closed quantum systems, and has recentl...
Hamiltonian Engineering in Quantum Spin Networks.
Ieshan Vaidya·Jun 7, 2018
Quantum simulation presents itself as one of the biggest advantages of developing quantum computers. Simulating a quantum system classically is almost impossible beyond a certain system size whereas a controllable quantum system inherently has the re...
Benchmarking of quantum processors with random circuits
James R. Wootton·Jun 7, 2018
Quantum processors with sizes in the 10-100 qubit range are now increasingly common. However, with increased size comes increased complexity for benchmarking. The effectiveness of a given device may vary greatly between different tasks, and will not ...