Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Algorithm and Circuit of Nesting Doubled Qubits
A. Grigoryan, S. Agaian·Jan 1, 2022
Copying the quantum states is contradictory to classical information processing since the fundamental difference between classical and quantum information is that while classical information can be copied perfectly, quantum information cannot. Howeve...
Quantum simulation of fermionic systems using hybrid digital–analog quantum computing approach
N. Guseynov, W. Pogosov·Dec 30, 2021
We consider a hybrid digital–analog quantum computing approach, which allows implementing any quantum algorithm without standard two-qubit gates. This approach is based on the always-on interaction between qubits, which can provide an alternative to ...
Scalable algorithm simplification using quantum AND logic
Ji Chu, Xiaoyu He, Yuxuan Zhou +36 more·Dec 30, 2021
Implementing quantum algorithms on realistic devices requires translating high-level global operations into sequences of hardware-native logic gates, a process known as quantum compiling. Physical limitations, such as constraints in connectivity and ...
Decomposing the generalized Toffoli gate with qutrits
Anna Sergeevna Nikolaeva, E. Kiktenko, A. Fedorov·Dec 29, 2021
The problem of finding efficient decompositions of multi-qubit gates is of importance for quantum computing, especially, in application to existing noisy intermediate-scale quantum devices, whose resources are substantially limited. Here we propose a de...
Computational Advantage from a Quantum Superposition of Qubit Gate Orders.
Martin J. Renner, Č. Brukner·Dec 29, 2021
In an ordinary quantum algorithm the gates are applied in a fixed order on the systems. The introduction of indefinite causal structures allows us to relax this constraint and control the order of the gates with an additional quantum state. It is kno...
Automatic quantum circuit encoding of a given arbitrary quantum state
T. Shirakawa, H. Ueda, S. Yunoki·Dec 29, 2021
We introduce an quantum-classical hybrid algorithm, named automatic quantum circuit encoding (AQCE), that is designed to encode an arbitrary quantum state |Ψ〉 onto an optimal quantum circuit Ĉ composed of a finite set of single- and two-qubit quantu...
Optimized Compiler for Distributed Quantum Computing
Daniele Cuomo, M. Caleffi, Kevin Krsulich +4 more·Dec 28, 2021
Practical distributed quantum computing requires the development of efficient compilers, able to make quantum circuits compatible with some given hardware constraints. This problem is known to be tough, even for local computing. Here, we address it o...
Coherent Atom Transport via Enhanced Shortcuts to Adiabaticity: Double-Well Optical Lattice
Sascha H. Hauck, V. Stojanović·Dec 28, 2021
Theoretical studies of coherent atom transport have as yet mainly been restricted to one-dimensional model systems with harmonic trapping potentials. Here we investigate this important phenomenon -- a prerequisite for a variety of quantum-technology ...
Circuit Symmetry Verification Mitigates Quantum-Domain Impairments
Yifeng Xiong, Daryus Chandra, S. Ng +1 more·Dec 27, 2021
State-of-the-art noisy intermediate-scale quantum computers require low-complexity techniques for the mitigation of computational errors inflicted by quantum decoherence. Symmetry verification constitutes a class of quantum error mitigation (QEM) tec...
Quantum autoencoders for communication-efficient quantum cloud computing
Yan Zhu, Ge Bai, Yuexuan Wang +2 more·Dec 23, 2021
In the model of quantum cloud computing, the server executes a computation on the quantum data provided by the client. In this scenario, it is important to reduce the amount of quantum communication between the client and the server. A possible appro...
Quantum dynamics simulations beyond the coherence time on noisy intermediate-scale quantum hardware by variational Trotter compression
Noah F. Berthusen, T. V. Trevisan, T. Iadecola +1 more·Dec 23, 2021
We demonstrate a post-quench dynamics simulation of a Heisenberg model on present-day IBM quantum hardware that extends beyond the coherence time of the device. This is achieved using a hybrid quantum-classical algorithm that propagates a state using...
Using Shor’s algorithm on near term Quantum computers: a reduced version
M. Rossi, Luca Asproni, D. Caputo +5 more·Dec 23, 2021
Considering its relevance in the field of cryptography, integer factorization is a prominent application where Quantum computers are expected to have a substantial impact. Thanks to Shor’s algorithm, this peculiar problem can be solved in polynomial ...
Realizations of Measurement Based Quantum Computing
S. Shah·Dec 22, 2021
The Measurement Based Quantum Computation (MBQC) model achieves universal quantum computation by employing projective single qubit measurements with classical feedforward on a highly entangled multipartite cluster state [1]. Rapid advances in improvi...
Two-dimensional $\mathbb{Z}_2$ lattice gauge theory on a near-term quantum simulator: variational quantum optimization, confinement, and topological order
Luca Lumia, Pietro Torta, G. Mbeng +4 more·Dec 22, 2021
We propose an implementation of a two-dimensional $\mathbb{Z}_2$ lattice gauge theory model on a shallow quantum circuit, involving a number of single and two-qubits gates comparable to what can be achieved with present-day and near-future technologi...
Efficient Floating Point Arithmetic for Quantum Computers
Raphael Seidel, Nikolay Tcholtchev, Sebastian Bock +2 more·Dec 20, 2021
One of the major promises of quantum computing is the realization of SIMD (single instruction - multiple data) operations using the phenomenon of superposition. Since the dimension of the state space grows exponentially with the number of qubits, we ...
Measurement-based generation and preservation of cat and grid states within a continuous-variable cluster state
M. Eaton, C. González-Arciniegas, R. N. Alexander +2 more·Dec 20, 2021
We present an algorithm to reliably generate various quantum states critical to quantum error correction and universal continuous-variable (CV) quantum computing, such as Schrödinger cat states and Gottesman-Kitaev-Preskill (GKP) grid states, out of ...
Scalable Randomized Benchmarking of Quantum Computers Using Mirror Circuits.
T. Proctor, Stefan Seritan, K. Rudinger +3 more·Dec 18, 2021
The performance of quantum gates is often assessed using some form of randomized benchmarking. However, the existing methods become infeasible for more than approximately five qubits. Here we show how to use a simple and customizable class of circuit...
Optimal Model for Fewer-Qubit CNOT Gates With Rydberg Atoms
Rui Li, Shurui Li, Dongmin Yu +2 more·Dec 16, 2021
Fewer-qubit quantum logic gate, serving as a basic unit for constructing universal multiqubit gates, has been widely applied in quantum computing and quantum information. However, traditional constructions for fewer-qubit gates often utilize a multi-...
Two-level quantum walkers on directed graphs. I. Universal quantum computing
Ryo Asaka, K. Sakai, Ryoko Yahagi·Dec 15, 2021
In the present paper, the first in a series of two, we propose a model of universal quantum computation using a fermionic/bosonic multi-particle continuous-time quantum walk with two internal states (e.g., the spin-up and down states of an electron)....
Quantum expectation-value estimation by computational basis sampling
M. Kohda, R. Imai, Keita Kanno +3 more·Dec 14, 2021
Measuring expectation values of observables is an essential ingredient in variational quantum algorithms. A practical obstacle is the necessity of a large number of measurements for statistical convergence to meet requirements of precision, such as c...