Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Statistical mechanics of quantum error correcting codes
Yaodong Li, M. Fisher·Jul 7, 2020
We study stabilizer quantum error-correcting codes (QECC) generated under hybrid dynamics of local Clifford unitaries and local Pauli measurements in one dimension. Building upon 1) a general formula relating the error-susceptibility of a subregion t...
Measurement error mitigation in quantum computers through classical bit-flip correction
L. Funcke, T. Hartung, K. Jansen +3 more·Jul 7, 2020
We develop a classical bit-flip correction method to mitigate measurement errors on quantum computers. This method can be applied to any operator, any number of qubits, and any realistic bit-flip probability. We first demonstrate the successful perfo...
Colored props for large scale graphical reasoning
T. Carette, S. Perdrix·Jul 7, 2020
The prop formalism allows representation of processes withstring diagrams and has been successfully applied in various areas such as quantum computing, electric circuits and control flow graphs. However, these graphical approaches suffer from scalabi...
Wishart and random density matrices: Analytical results for the mean-square Hilbert-Schmidt distance
Santosh Kumar·Jul 6, 2020
Hilbert-Schmidt distance is one of the prominent distance measures in quantum information theory which finds applications in diverse problems, such as construction of entanglement witnesses, quantum algorithms in machine learning, and quantum-state t...
Quantum State Learning via Single-Shot Measurements.
Sang Min Lee, H. Park, Jinhyoung Lee +2 more·Jul 6, 2020
A novel machine-learning algorithm based on single-shot measurements, named single-shot measurement learning, is demonstrated achieving the theoretical optimal accuracy. The method is at least as efficient as existing tomographic schemes and computat...
Grover search with smaller oracles
Dan Li·Jul 6, 2020
Grover search is one of the most important quantum algorithms. In this paper, we consider a kind of search that the conditions of satisfaction $T$ can be rewritten as $T=T_1\bigcap T_2$. Then we present a new Grover search with smaller oracles. The t...
Quantum Lower and Upper Bounds for 2D-Grid and Dyck Language
A. Ambainis, K. Balodis, Janis Iraids +6 more·Jul 6, 2020
We study the quantum query complexity of two problems. First, we consider the problem of determining if a sequence of parentheses is a properly balanced one (a Dyck word), with a depth of at most $k$. We call this the $Dyck_{k,n}$ problem. We prove ...
Cryogenic operation of silicon photonic modulators based on the DC Kerr effect
Uttara Chakraborty, J. Carolan, Genevieve Clark +4 more·Jul 4, 2020
Reliable operation of photonic integrated circuits at cryogenic temperatures would enable new capabilities for emerging computing platforms, such as quantum technologies and low-power cryogenic computing. The silicon-on-insulator platform is a highly...
On Actual Preparation of Dicke State on a Quantum Computer
Chandra Sekhar Mukherjee, S. Maitra, V. Gaurav +1 more·Jul 3, 2020
The exact number of CNOT and single qubit gates needed to implement a Quantum Algorithm in a given architecture is one of the central problems of Quantum Computation. In this work we study the importance of concise realizations of Partially defined U...
Qubit-efficient encoding schemes for binary optimisation problems
Benjamin Tan, M. Lemonde, Supanut Thanasilp +2 more·Jul 3, 2020
We propose and analyze a set of variational quantum algorithms for solving quadratic unconstrained binary optimization problems where a problem consisting of nc classical variables can be implemented on O(lognc) number of qubits. The underlying enco...
Surpassing the Resistance Quantum with a Geometric Superinductor
M. Peruzzo, A. Trioni, F. Hassani +2 more·Jul 3, 2020
The superconducting circuit community has recently discovered the promising potential of superinductors. These circuit elements have a characteristic impedance exceeding the resistance quantum $R_\text{Q} \approx 6.45~\text{k}\Omega$ which leads to a...
A switching approach for perfect state transfer over a scalable and routing enabled network architecture with superconducting qubits
Siddhant Singh·Jul 3, 2020
We propose a hypercube switching architecture for the perfect state transfer (PST) where we prove that it is always possible to find an induced hypercube in any given hypercube of any dimension such that PST can be performed between any two given ver...
Preparing symmetry broken ground states with variational quantum algorithms
N. Vogt, S. Zanker, Jan-Michael Reiner +3 more·Jul 3, 2020
One of the most promising applications for near term quantum computers is the simulation of physical quantum systems, particularly many-electron systems in chemistry and condensed matter physics. In solid state physics, finding the correct symmetry b...
A unitary operator construction solution based on Pauli group for maximal dense coding with a class of symmetric states
Wenjie Liu, Junxiu Chen, Wenbin Yu +2 more·Jul 3, 2020
Quantum dense coding plays an important role in quantum cryptography communication, and how to select a set of appropriate unitary operators to encode message is the primary work in the design of quantum communication protocols. Shukla et al. propose...
Approximate quantum circuit synthesis using block encodings
Daan Camps, Roel Van Beeumen·Jul 2, 2020
Author(s): Camps, Daan; Beeumen, Roel Van | Abstract: One of the challenges in quantum computing is the synthesis of unitary operators into quantum circuits with polylogarithmic gate complexity. Exact synthesis of generic unitaries requires an expone...
Machine Learning of Noise-Resilient Quantum Circuits
L. Cincio, K. Rudinger, M. Sarovar +1 more·Jul 2, 2020
Noise mitigation and reduction will be crucial for obtaining useful answers from near-term quantum computers. In this work, we present a general framework based on machine learning for reducing the impact of quantum hardware noise on quantum circuits...
Multi-exponential error extrapolation and combining error mitigation techniques for NISQ applications
Z. Cai·Jul 2, 2020
Noise in quantum hardware remains the biggest roadblock for the implementation of quantum computers. To fight the noise in the practical application of near-term quantum computers, instead of relying on quantum error correction which requires large q...
Quantum Simulation with Hybrid Tensor Networks.
Xiao Yuan, Jinzhao Sun, Junyu Liu +2 more·Jul 2, 2020
Tensor network theory and quantum simulation are, respectively, the key classical and quantum computing methods in understanding quantum many-body physics. Here, we introduce the framework of hybrid tensor networks with building blocks consisting of ...
Rydberg noisy dressing and applications in making soliton molecules and droplet quasicrystals
M. Khazali·Jul 2, 2020
The current advances in the field of ultra-cold atoms and atomic traps recall new controllable long-range interactions. These interactions are expected to extend the range of realizable quantum algorithms as well as providing new control mechanisms f...
Boltzmann machine learning with a variational quantum algorithm
Yuta Shingu, Yuya Seki, S. Watabe +5 more·Jul 2, 2020
Boltzmann machine is a powerful tool for modeling probability distributions that govern the training data. A thermal equilibrium state is typically used for Boltzmann machine learning to obtain a suitable probability distribution. The Boltzmann machi...