Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Recycling qubits in near-term quantum computers
Galit Anikeeva, Isaac H. Kim, P. Hayden·Dec 3, 2020
Quantum computers are capable of efficiently contracting unitary tensor networks, a task that is likely to remain difficult for classical computers. For instance, networks based on matrix product states or the multi-scale entanglement renormalization...
Accurately computing the electronic properties of a quantum ring
C. Neill, T. McCourt, X. Mi +89 more·Dec 2, 2020
A promising approach to study condensed-matter systems is to simulate them on an engineered quantum platform1–4. However, the accuracy needed to outperform classical methods has not been achieved so far. Here, using 18 superconducting qubits, we prov...
All-optical long-distance quantum communication with Gottesman-Kitaev-Preskill qubits
Kosuke Fukui, R. N. Alexander, P. van Loock·Nov 30, 2020
Quantum repeaters are a promising platform for realizing long-distance quantum communication and thus could form the backbone of a secure quantum internet, a scalable quantum network, or a distributed quantum computer. Repeater protocols that encode ...
Matchgate benchmarking: Scalable benchmarking of a continuous family of many-qubit gates
J. Helsen, Sepehr Nezami, M. Reagor +1 more·Nov 25, 2020
We propose a method to reliably and efficiently extract the fidelity of many-qubit quantum circuits composed of continuously parametrized two-qubit gates called matchgates. This method, which we call matchgate benchmarking, relies on advanced techniq...
Reducing the CNOT Count for Clifford+T Circuits on NISQ Architectures
Vlad Gheorghiu, Jiaxin Huang, Sarah Meng Li +2 more·Nov 24, 2020
While mapping a quantum circuit to the physical layer one has to consider the numerous constraints imposed by the underlying hardware architecture. Connectivity of the physical qubits is one such constraint that restricts two-qubit operations, such a...
Quadratic Clifford expansion for efficient benchmarking and initialization of variational quantum algorithms
K. Mitarai, Yasunari Suzuki, W. Mizukami +2 more·Nov 19, 2020
Variational quantum algorithms are appealing applications of near-term quantum computers. However, there are two major issues to be solved, that is, we need an efficient initialization strategy for parametrized quantum circuit and to know the limitat...
Securing Quantum Computations in the NISQ Era
D. Leichtle, Luka Music, E. Kashefi +1 more·Nov 19, 2020
Recent experimental achievements motivate an ever-growing interest from companies starting to feel the limitations of classical computing. Yet, in light of ongoing privacy scandals, the future availability of quantum computing through remotely access...
Proposal for Entangling Gates on Fluxonium Qubits via a Two-Photon Transition
K. Nesterov, Q. Ficheux, V. Manucharyan +1 more·Nov 19, 2020
We propose a family of microwave-activated entangling gates on two capacitively coupled fluxonium qubits. A microwave pulse applied to either qubit at a frequency near the half-frequency of the $|00\rangle - |11\rangle$ transition induces two-photon ...
Hole Spin Qubits in Si FinFETs With Fully Tunable Spin-Orbit Coupling and Sweet Spots for Charge Noise
S. Bosco, B. Het'enyi, D. Loss·Nov 18, 2020
The strong spin-orbit coupling in hole spin qubits enables fast and electrically tunable gates, but at the same time enhances the susceptibility of the qubit to charge noise. Suppressing this noise is a significant challenge in semiconductor quantum ...
Dispersive measurement of a semiconductor double quantum dot via 3D integration of a high-impedance TiN resonator
Nathan Holman, D. Rosenberg, D. Yost +5 more·Nov 17, 2020
Spins in semiconductor quantum dots are a candidate for cryogenic quantum processors due to their exceptionally long coherence times. One major challenge to scaling quantum dot spin qubits is the dense wiring requirements, making it difficult to envi...
Fault-Tolerant Qubit from a Constant Number of Components
Kianna Wan, Soonwon Choi, Isaac H. Kim +2 more·Nov 16, 2020
With gate error rates in multiple technologies now below the threshold required for fault-tolerant quantum computation, the major remaining obstacle to useful quantum computation is scaling, a challenge greatly amplified by the huge overhead imposed ...
Quantum simulations of molecular systems with intrinsic atomic orbitals
Stefano Barison, D. Galli, M. Motta·Nov 16, 2020
Quantum simulations of quantum chemistry systems on quantum computers often employ minimal basis sets of Gaussian orbitals. In comparison with more realistic basis sets, quantum simulations employing minimal basis sets require fewer qubits and quantu...
Exploiting Quantum Teleportation in Quantum Circuit Mapping
S. Hillmich, Alwin Zulehner, R. Wille·Nov 14, 2020
Quantum computers are constantly growing in their number of qubits, but continue to suffer from restrictions such as the limited pairs of qubits that may interact with each other. Thus far, this problem is addressed by mapping and moving qubits to su...
Efficient CNOT Synthesis for NISQ Devices
Yao Tang·Nov 12, 2020
In the era of noisy intermediate-scale quantum (NISQ), executing quantum algorithms on actual quantum devices faces unique challenges. One such challenge is that quantum devices in this era have restricted connectivity: quantum gates are allowed to a...
Comparative Study of Sampling-Based Simulation Costs of Noisy Quantum Circuits
Shigeo Hakkaku, K. Fujii·Nov 12, 2020
There have been intensive efforts to develop quantum computers, and the number of qubits is now reaching around 50 qubits. In practice, not only the number of qubits but the fidelity of the gates and measurements plays an important role. The noise in...
Exponential Error Suppression for Near-Term Quantum Devices
B'alint Koczor·Nov 11, 2020
As quantum computers mature, quantum error correcting codes (QECs) will be adopted in order to suppress errors to any desired level $\mathcal{E}$ at a cost in qubit-count $n$ that is merely poly-logarithmic in $\mathcal{E}^{-1}$. However in the NISQ ...
Low-Depth Hamiltonian Simulation by an Adaptive Product Formula.
Zi-Jian Zhang, Jinzhao Sun, Xiao Yuan +1 more·Nov 10, 2020
Various Hamiltonian simulation algorithms have been proposed to efficiently study the dynamics of quantum systems on a quantum computer. The existing algorithms generally approximate the time evolution operators, which may need a deep quantum circuit...
Focus beyond Quadratic Speedups for Error-Corrected Quantum Advantage
R. Babbush, J. McClean, M. Newman +3 more·Nov 9, 2020
We discuss conditions under which it would be possible for a modest fault-tolerant quantum computer to realize a runtime advantage by executing a quantum algorithm with only a small polynomial speedup over the best classical alternative. The challeng...
Obscure Qubits and Membership Amplitudes
S. Duplij, R. Vogl·Nov 9, 2020
We propose a concept of quantum computing which incorporates an additional kind of uncertainty, i.e. vagueness (fuzziness), in a natural way by introducing new entities, obscure qudits (e.g. obscure qubits), which are characterized simultaneously by ...
Lipkin model on a quantum computer
Michael J. Cervia, A. Balantekin, S. Coppersmith +5 more·Nov 8, 2020
Atomic nuclei are important laboratories for exploring and testing new insights into the universe, such as experiments to directly detect dark matter or explore properties of neutrinos. The targets of interest are often heavy, complex nuclei that cha...