Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Towards a NISQ Algorithm to Simulate Hermitian Matrix Exponentiation
Keren Li·May 28, 2021
A practical fault-tolerant quantum computer is worth looking forward to as it provides applications that outperform their known classical counterparts. However, millions of interacting qubits with stringent criteria are required, which is intractable...
Krylov variational quantum algorithm for first principles materials simulations
François Jamet, Abhishek Agarwal, C. Lupo +3 more·May 27, 2021
We propose an algorithm to obtain Green's functions as a continued fraction on quantum computers, which is based on the construction of the Krylov basis using variational quantum algorithms, and included in a Lanczos iterative scheme. This allows the...
Algorithm for initializing a generalized fermionic Gaussian state on a quantum computer
Michael P. Kaicher, Simon B. Jäger, F. Wilhelm·May 27, 2021
We present explicit expressions for the central piece of a variational method developed by Shi et al (2018 Ann. Phys. 390 245) which extends variational wave functions that are efficiently computable on classical computers beyond mean-field to genera...
Phase-state duality in reversible circuit design
M. Amy, N. J. Ross·May 27, 2021
The reversible implementation of classical functions accounts for the bulk of most known quantum algorithms. As a result, a number of reversible circuit constructions over the Clifford+$T$ gate set have been developed in recent years which use both t...
Improving readout in quantum simulations with repetition codes
Jakob Günther, F. Tacchino, James R. Wootton +2 more·May 27, 2021
Near term quantum computers suffer from the presence of different noise sources. In order to mitigate for this effect and acquire results with significantly better accuracy, there is the urge of designing efficient error correction or error mitigatio...
Quantum mean-value approximator for hard integer-value problems
David Joseph, Antonio J. Martinez, Cong Ling +1 more·May 27, 2021
Evaluating the expectation of a quantum circuit is a classically difficult problem known as the quantum mean value problem (QMV). It is used to optimize the quantum approximate optimization algorithm and other variational quantum eigensolvers. We sho...
PyMatching: A Python Package for Decoding Quantum Codes with Minimum-Weight Perfect Matching
O. Higgott·May 27, 2021
This article introduces PyMatching, a fast open-source Python package for decoding quantum error-correcting codes with the minimum-weight perfect matching (MWPM) algorithm. PyMatching includes the standard MWPM decoder as well as a variant, which we ...
Optimizing quantum codes with an application to the loss channel with partial erasure information
Benjamin Desef, M. Plenio·May 27, 2021
Quantum error correcting codes (QECCs) are the means of choice whenever quantum systems suffer errors, e.g., due to imperfect devices, environments, or faulty channels. By now, a plethora of families of codes is known, but there is no universal appro...
Overlapped grouping measurement: A unified framework for measuring quantum states
Bujiao Wu, Jinzhao Sun, Qi Huang +1 more·May 27, 2021
Quantum algorithms designed for realistic quantum many-body systems, such as chemistry and materials, usually require a large number of measurements of the Hamiltonian. Exploiting different ideas, such as importance sampling, observable compatibility...
Microwave-to-optical conversion with a gallium phosphide photonic crystal cavity
Simon Hönl, Y. Popoff, D. Caimi +3 more·May 27, 2021
Electrically actuated optomechanical resonators provide a route to quantum-coherent, bidirectional conversion of microwave and optical photons. Such devices could enable optical interconnection of quantum computers based on qubits operating at microw...
High-speed programmable photonic circuits in a cryogenically compatible, visible–near-infrared 200 mm CMOS architecture
M. Dong, Genevieve Clark, A. Leenheer +7 more·May 26, 2021
Recent advances in photonic integrated circuits have enabled a new generation of programmable Mach–Zehnder meshes (MZMs) realized by using cascaded Mach–Zehnder interferometers capable of universal linear-optical transformations on N input/output opt...
GraphStateVis: Interactive Visual Analysis of Qubit Graph States and their Stabilizer Groups
Matthias Miller, Daniel Miller·May 26, 2021
Fathoming out quantum state space is a challenging endeavor due to its exponentially growing dimensionality. At the expense of being bound in its expressiveness, the discrete and finite subspace of graph states is easier to investigate via a pictoria...
Qubitization of Bosons
Xinyao Huang, Lang Yu, Xuedong Lu +5 more·May 26, 2021
A binary mapping from Fock space of bosonic state to qubits is given. Based on the binary mapping, we construte an algorithm of qubitization of bosons with complexity O(log(N)). As an example, the algorithm of qubitization of bosons in matrix product...
Perspective - On the thermodynamics of perfect unconditional security
Christiana Chamon, L. Kish·May 26, 2021
A secure key distribution (exchange) scheme is unconditionally secure if it is unbreakable against arbitrary technological improvements of computing power and/or any development of new algorithms. There are only two families of experimentally realize...
Testing symmetry on quantum computers
Margarite L. LaBorde, M. Wilde·May 26, 2021
Symmetry is a unifying concept in physics. In quantum information and beyond, it is known that quantum states possessing symmetry are not useful for certain information-processing tasks. For example, states that commute with a Hamiltonian realizing a...
Hybrid Exchange–Measurement-Based Qubit Operations in Semiconductor Double-Quantum-Dot Qubits
M. Brooks, C. Tahan·May 26, 2021
Measurement-based quantum computing (MBQC) promises natural compatibility with quantum error correcting codes at the cost of a polynomial increase in physical qubits. MBQC proposals have largely focused on photonic systems, where 2-qubit gates are di...
Fault-Tolerant Quantum Simulations of Chemistry in First Quantization
Yuan Su, D. Berry, N. Wiebe +2 more·May 26, 2021
Quantum simulations of chemistry in first quantization offer important advantages over approaches in second quantization including faster convergence to the continuum limit and the opportunity for practical simulations outside the Born-Oppenheimer ap...
Lee Weight for Nonbinary Quantum Error Correction
R. Matsumoto·May 26, 2021
We propose the quantum Lee weight for quantum errors, provide a Gilbert-Varshamov type bound, and a code construction for the proposed weight.
Efficient Quantum Public-Key Encryption From Learning With Errors
Javad Doliskani·May 26, 2021
Our main result is a quantum public-key encryption scheme based on the Extrapolated Dihedral Coset problem (EDCP) which is equivalent, under quantum polynomial-time reductions, to the Learning With Errors (LWE) problem. For limited number of public k...
Compressed Sensing Measurement of Long-Range Correlated Noise
Alireza Seif, M. Hafezi, Yi-Kai Liu·May 26, 2021
Long-range correlated errors can severely impact the performance of NISQ (noisy intermediate-scale quantum) devices, and fault-tolerant quantum computation. Characterizing these errors is important for improving the performance of these devices, via ...