Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Decoder for the Triangular Color Code by Matching on a Möbius Strip
K. Sahay, Benjamin J. Brown·Aug 25, 2021
The color code is remarkable for its ability to perform fault-tolerant logic gates. This motivates the design of practical decoders that minimise the resource cost of color-code quantum computation. Here we propose a decoder for the planar color code...
Fast Multiqubit Gates through Simultaneous Two-Qubit Gates
X. Gu, Jorge Fernández-Pendás, Pontus Vikstål +8 more·Aug 25, 2021
Near-term quantum computers are limited by the decoherence of qubits to only being able to run low-depth quantum circuits with acceptable fidelity. This severely restricts what quantum algorithms can be compiled and implemented on such devices. One wa...
Autonomous Estimation of High-Dimensional Coulomb Diamonds from Sparse Measurements
A. Chatterjee, Fabio Ansaloni, Torbjørn Rasmussen +5 more·Aug 24, 2021
Quantum dot arrays possess ground states governed by Coulomb energies, utilized prominently by singly occupied quantum dots, each implementing a spin qubit. For such quantum processors, the controlled transitions between ground states are of operatio...
A Fault-Tolerant Honeycomb Memory
C. Gidney, M. Newman, A. Fowler +1 more·Aug 24, 2021
Recently, Hastings & Haah introduced a quantum memory defined on the honeycomb lattice. Remarkably, this honeycomb code assembles weight-six parity checks using only two-local measurements. The sparse connectivity and two-local measurements are desir...
High-fidelity three-qubit iToffoli gate for fixed-frequency superconducting qubits
Yosep Kim, A. Morvan, Long B. Nguyen +6 more·Aug 23, 2021
The development of noisy intermediate-scale quantum devices has extended the scope of executable quantum circuits with high-fidelity single- and two-qubit gates. Equipping these devices with three-qubit gates will enable the realization of more compl...
Scalable error mitigation for noisy quantum circuits produces competitive expectation values
Youngseok Kim, C. J. Wood, Theodore J. Yoder +4 more·Aug 20, 2021
A technique called error mitigation can significantly improve the performance of large-scale quantum computations on near-term devices without the significant resource overheard of fault-tolerant quantum error correction. Noise in existing quantum pr...
Simulating gauge theories with variational quantum eigensolvers in superconducting microwave cavities
Jinglei Zhang, Ryan M. Ferguson, S. Kühn +4 more·Aug 18, 2021
Quantum-enhanced computing methods are promising candidates to solve currently intractable problems. We consider here a variational quantum eigensolver (VQE), that delegates costly state preparations and measurements to quantum hardware, while classi...
Testable Designs of Toffoli Fredkin Reversible Circuits
Rohit Kundu, Hritam Basak, Akhil Koilada +3 more·Aug 17, 2021
Loss of every bit in traditional logic circuits involves dissipation of power in the form of heat that evolve to the environment. Reversible logic is one of the alternatives that have capabilities to mitigate this dissipation by preventing the loss o...
Tensor Networks for Simulating Quantum Circuits on FPGAs
Maksim Levental·Aug 15, 2021
Most research in quantum computing today is performed against simulations of quantum computers rather than true quantum computers. Simulating a quantum computer entails implementing all of the unitary operators corresponding to the quantum gates as t...
LILLIPUT: A Lightweight Low-Latency Lookup-Table Based Decoder for Near-term Quantum Error Correction
Poulami Das, A. Locharla, Cody Jones·Aug 14, 2021
The error rates of quantum devices are orders of magnitude higher than what is needed to run most quantum applications. To close this gap, Quantum Error Correction (QEC) encodes logical qubits and distributes information using several physical qubits...
Playing with a Quantum Computer
Rainer Muller, Franziska Greinert·Aug 13, 2021
The new quantum technologies are currently attracting a great deal of public attention. This application area of quantum physics is expected to provide significant technological and economic opportunities. Major projects such as the Quantum Flagship ...
Multi-Tensor Contraction for XEB Verification of Quantum Circuits
G. Kalachev, Pavel Panteleev, M. Yung·Aug 12, 2021
The computational advantage of noisy quantum computers has been demonstrated by sampling the bitstrings of quantum random circuits. An important issue is how the performance of quantum devices could be quantified in the so-called"supremacy regime". T...
Designing gate operations for single ion quantum computing in rare-earth-ion-doped crystals
A. Kinos, L. Rippe, S. Kroll +1 more·Aug 10, 2021
Quantum computers based on rare-earth-ion-doped crystals show promising properties in terms of scalability and connectivity if single ions can be used as qubits. Through simulations, we investigate gate operations on such qubits and discuss how gate ...
Deterministic one-way logic gates on a cloud quantum computer
Zhi-Peng Yang, Huan-Yu Ku, A. Baishya +6 more·Aug 9, 2021
One-way quantum computing is a promising candidate for fault-tolerant quantum computing. Here, we propose new protocols to realize a deterministic one-way CNOT gate and one-way $X$-rotations on quantum-computing platforms. By applying a delayed-choic...
Decodable hybrid dynamics of open quantum systems with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="double-struck">Z</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> symmetry
Yaodong Li, Matthew Fisher·Aug 9, 2021
We explore a class of"open"quantum circuit models with local decoherence ("noise") and local projective measurements, each respecting a global Z_2 symmetry. The model supports a spin glass phase where the Z_2 symmetry is spontaneously broken (not pos...
Algebraic Compression of Quantum Circuits for Hamiltonian Evolution
Efekan Kökcü, Daan Camps, Lindsay Bassman +4 more·Aug 6, 2021
Unitary evolution under a time dependent Hamiltonian is a key component of simulation on quantum hardware. Synthesizing the corresponding quantum circuit is typically done by breaking the evolution into small time steps, also known as Trotterization,...
Extending the Graph Formalism to Higher-Order Gates
A. Khesin, K. Ren·Aug 5, 2021
We present an algorithm for efficiently simulating a quantum circuit in the graph formalism. In the graph formalism, we present states as a linear combination of graphs with Clifford operations on their vertices. We show how a $\calC_3$ gate such as ...
Fast universal quantum gate above the fault-tolerance threshold in silicon
A. Noiri, K. Takeda, T. Nakajima +4 more·Aug 5, 2021
Fault-tolerant quantum computers that can solve hard problems rely on quantum error correction1. One of the most promising error correction codes is the surface code2, which requires universal gate fidelities exceeding an error correction threshold o...
Towards Demonstrating Fault Tolerance in Small Circuits Using Bacon-Shor Codes
Ariel Shlosberg, A. Polloreno, Graeme Smith·Aug 4, 2021
Quantum error correction is necessary to perform large-scale quantum computations in the presence of noise and decoherence. As a result, several aspects of quantum error correction have already been explored. These have been primarily studies of quan...
2QAN: a quantum compiler for 2-local qubit hamiltonian simulation algorithms
L. Lao, D. Browne·Aug 4, 2021
Simulating quantum systems is one of the most important potential applications of quantum computers. The high-level circuit defining the simulation needs to be compiled into one that complies with hardware limitations such as qubit architecture (conn...