Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Latency-aware adaptive shot allocation for run-time efficient variational quantum algorithms
Kosuke Ito·Feb 9, 2023
Efficient classical optimizers are crucial in practical implementations of Variational Quantum Algorithms (VQAs). In particular, to make Stochastic Gradient Descent (SGD) resource efficient, adaptive strategies have been proposed to determine the num...
Measurement-Altered Ising Quantum Criticality
S. Murciano, Pablo Sala, Yue Liu +2 more·Feb 8, 2023
Quantum critical systems constitute appealing platforms for the exploration of novel measurement-induced phenomena due to their innate sensitivity to perturbations. We study the impact of measurement on paradigmatic Ising quantum critical chains usin...
Autonomous coherence protection of a two-level system in a fluctuating environment
Fernando Quijandr'ia, J. Twamley·Feb 8, 2023
We re-examine a scheme generalized by [R. Finkelstein et al, Phys. Rev. X 11, 011008 (2021)], whose original purpose was to remove the effects of static Doppler broadening from an ensemble of non-interacting two-level systems (qubits). This scheme in...
Quantum computation of frequency-domain molecular response properties using a three-qubit iToffoli gate
Shiya Sun, Brett Marinelli, Jin Ming Koh +7 more·Feb 8, 2023
The quantum computation of molecular response properties on near-term quantum hardware is a topic of substantial interest. Computing these properties directly in the frequency domain is desirable, but the circuits require large depth if the typical h...
Simulation of Kitaev chain using one-dimensional chain of superconducting qubits and environmental effects on topological states
Yang Zhang, Yunhui Ge, Yu-xi Liu·Feb 8, 2023
Kitaev chain is one of the important physical models for studying topological quantum states and quantum computing. We here propose an approach to simulate the one-dimensional Kitaev chain via a circuit of superconducting qubits. In our approach, all...
Qualitative quantum simulation of resonant tunneling and localization with the shallow quantum circuits
P. Wang·Feb 7, 2023
In a circuit-based quantum computer, the computing is performed via the discrete-time evolution driven by quantum gates. Accurate simulation of continuoustime evolution requires a large number of quantum gates and therefore suffers from more noise. I...
On-the-fly Tailoring towards a Rational Ansatz Design for Digital Quantum Simulations
D. Mondal, Sonaldeep Halder, Dipa Halder +1 more·Feb 7, 2023
Recent advancements in quantum information and quantum technology has stimulated a good deal of interest in the development of quantum algorithms for energetics and properties of many-fermionic systems. While the variational quantum eigensolver is th...
Optimal Wire Cutting With Classical Communication
Lukas Brenner, C. Piveteau, David Sutter·Feb 7, 2023
Circuit knitting is the process of partitioning large quantum circuits into smaller subcircuits such that the result of the original circuits can be deduced by only running the subcircuits. Such techniques will be crucial for near-term and early faul...
Quantum Embedding Method for the Simulation of Strongly Correlated Systems on Quantum Computers
Max Rossmannek, Fabijan Pavošević, A. Rubio +1 more·Feb 6, 2023
Quantum computing has emerged as a promising platform for simulating strongly correlated systems in chemistry, for which the standard quantum chemistry methods are either qualitatively inaccurate or too expensive. However, due to the hardware limitat...
Computing the Many-Body Green’s Function with Adaptive Variational Quantum Dynamics
N. Gomes, David B. Williams-Young, W. D. de Jong·Feb 6, 2023
We present a method to compute the many-body real-time Green’s function using an adaptive variational quantum dynamics simulation approach. The real-time Green’s function involves the time evolution of a quantum state with one additional electron wit...
High-Threshold Codes for Neutral-Atom Qubits with Biased Erasure Errors
K. Sahay, J. Jin, J. Claes +2 more·Feb 6, 2023
The requirements for fault-tolerant quantum error correction can be simplified by leveraging structure in the noise of the underlying hardware. In this work, we identify a new type of structured noise motivated by neutral atom qubits, biased erasure ...
Precision of quantum simulation of all-to-all coupling in a local architecture
E. Mozgunov·Feb 5, 2023
We present a simple 2d local circuit that implements all-to-all interactions via perturbative gadgets. We find an analytic relation between the values $J_{ij}$ of the desired interaction and the parameters of the 2d circuit, as well as the expression...
Topological order from measurements and feed-forward on a trapped ion quantum computer
Mohsin Iqbal, Nathanan Tantivasadakarn, T. Gatterman +13 more·Feb 3, 2023
Quantum systems evolve in time in one of two ways: through the Schrödinger equation or wavefunction collapse. So far, deterministic control of quantum many-body systems in the lab has focused on the former, due to the probabilistic nature of measurem...
Low-depth simulations of fermionic systems on square-grid quantum hardware
Manuel G. Algaba, P. V. Sriluckshmy, M. Leib +1 more·Feb 3, 2023
We present a general strategy for mapping fermionic systems to quantum hardware with square qubit connectivity which yields low-depth quantum circuits, counted in the number of native two-qubit fSIM gates. We achieve this by leveraging novel operator...
Dynamical Quantum Phase Transitions of the Schwinger Model: Real-Time Dynamics on IBM Quantum
Domenico Pomarico, L. Cosmai, P. Facchi +3 more·Feb 2, 2023
Simulating the real-time dynamics of gauge theories represents a paradigmatic use case to test the hardware capabilities of a quantum computer, since it can involve non-trivial input states’ preparation, discretized time evolution, long-distance enta...
Scheme for parity-controlled multi-qubit gates with superconducting qubits
K. S. Christensen, N. Zinner, M. Kjaergaard·Feb 1, 2023
Multi-qubit parity measurements are at the core of many quantum error correction schemes. Extracting multi-qubit parity information typically involves using a sequence of multiple two-qubit gates. In this paper, we propose a superconducting circuit d...
Detecting entanglement of unknown states by violating the Clauser–Horne–Shimony–Holt inequality
J. Cort'es-Vega, J. F. Barra, L. Pereira +1 more·Jan 31, 2023
Entangled states play a fundamental role in quantum mechanics and are at the core of many contemporary applications, such as quantum communication and quantum computing. Therefore, determining whether a state is entangled or not is an important task....
Towards interpretable quantum machine learning via single-photon quantum walks
Fulvio Flamini, Marius Krumm, Lukas J. Fiderer +2 more·Jan 31, 2023
Variational quantum algorithms represent a promising approach to quantum machine learning where classical neural networks are replaced by parametrized quantum circuits. However, both approaches suffer from a clear limitation, that is a lack of interp...
Simulating lossy Gaussian boson sampling with matrix-product operators
Minzhao Liu, Changhun Oh, Junyu Liu +2 more·Jan 30, 2023
Gaussian boson sampling, a computational model that is widely believed to admit quantum supremacy, has already been experimentally demonstrated and is claimed to surpass the classical simulation capabilities of even the most powerful supercomputers t...
Partial and complete qubit estimation using a single observable: optimization and quantum simulation
C. Florez, J. Mart'inez-Cifuentes, K. Fonseca-Romero·Jan 26, 2023
. Quantum state estimation is an important task of many quantum information protocols. We consider two families of unitary evolution operators, one with a one-parameter and the other with a two-parameter, which enable the estimation of a single spin ...