Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum memory assisted observable estimation
L. Markovich, Attaallah Almasi, Sina Zeytinoğlu +1 more·Dec 15, 2022
The estimation of many-qubit observables is an essential task of quantum information processing. The generally applicable approach is to decompose the observables into weighted sums of multi-qubit Pauli strings, i.e., tensor products of single-qubit ...
Classical simulators as quantum error mitigators via circuit cutting
Ji Liu, Alvin Gonzales, Zain Saleem·Dec 14, 2022
We introduce an error mitigation framework that mitigates errors in a quantum circuit using circuit cutting. Our framework can be implemented in polynomial time for a wide variety of quantum circuits. Our technique involves cutting the circuit in suc...
Time-dependent Rabi frequencies to protect quantum operations on an atomic qutrit by continuous dynamical decoupling
Adonai Hilário da Silva, R. Napolitano, F. Fanchini +1 more·Dec 14, 2022
We investigate the form required for the time-dependent Rabi frequencies involved in a procedure capable to protect the action of quantum gates on an atomic qutrit by means of external fields continuously decoupling the system from the environmental ...
High-Threshold Quantum Computing by Fusing One-Dimensional Cluster States.
S. Paesani, Benjamin J. Brown·Dec 13, 2022
We propose a measurement-based model for fault-tolerant quantum computation that can be realized with one-dimensional cluster states and fusion measurements only; basic resources that are readily available with scalable photonic hardware. Our simulat...
Finite-round quantum error correction on symmetric quantum sensors
Yingkai Ouyang, Gavin K. Brennen·Dec 12, 2022
The Heisenberg limit provides a quadratic improvement over the standard quantum limit, and is the maximum quantum advantage that quantum sensors could provide over classical methods. This limit remains elusive, however, because of the inevitable pres...
Optimising graph codes for measurement-based loss tolerance
Thomas J. Bell, Love A. Pettersson, Stefano Paesani·Dec 9, 2022
Graph codes play an important role in photonic quantum technologies as they provide significant protection against qubit loss, a dominant noise mechanism. Here, we develop methods to analyse and optimise measurement-based tolerance to qubit loss and ...
Low-depth random Clifford circuits for quantum coding against Pauli noise using a tensor-network decoder
A. Darmawan, Y. Nakata, Shiro Tamiya +1 more·Dec 9, 2022
Recent work [M. J. Gullans et al., Physical Review X, 11(3):031066 (2021)] has shown that quantum error correcting codes defined by random Clifford encoding circuits can achieve a non-zero encoding rate in correcting errors even if the random circuit...
Universal Qudit Gate Synthesis for Transmons
Laurin E. Fischer, A. Chiesa, F. Tacchino +3 more·Dec 8, 2022
Gate-based quantum computers typically encode and process information in two-dimensional units called qubits. Using $d$-dimensional qudits instead may offer intrinsic advantages, including more efficient circuit synthesis, problem-tailored encodings ...
Universal Kardar-Parisi-Zhang scaling in noisy hybrid quantum circuits
Shuo Liu, Ming-Rui Li, Shi-Xin Zhang +2 more·Dec 7, 2022
Measurement-induced phase transitions (MIPT) have attracted increasing attention due to the rich phenomenology of entanglement structures and their relation with quantum information processing. Since physical systems are unavoidably coupled to enviro...
Controlling photon polarisation with a single quantum dot spin
E. Mehdi, Manuel Gundin-Martinez, C. Millet +9 more·Dec 7, 2022
In the framework of optical quantum computing and communications, a major objective consists in building receiving nodes that implement conditional operations on incoming photons, using the interaction with a single stationary qubit. In particular, t...
Review of ansatz designing techniques for variational quantum algorithms
Junhan Qin·Dec 7, 2022
For a large number of tasks, quantum computing demonstrates the potential for exponential acceleration over classical computing. In the NISQ era, variable-component subcircuits enable applications of quantum computing. To reduce the inherent noise an...
Self-protected quantum simulation and quantum phase estimation in the presence of classical noise
L. -A. Wu·Dec 7, 2022
The decoherence phenomenon inevitably exists in quantum computing processes. Consequently, dynamic suppression of decoherence for instance via dynamical decoupling, quantum error correction codes (QECC) etc. is crucial in accurately executing known o...
Generation of Perfectly Entangled Two and Three Qubits States by Classical Random Interaction
Javed Akram·Dec 6, 2022
This study examines the possibility of finding perfect entanglers for a Hamiltonian which corresponds to several quantum information platforms of interest at the present time. However, in this study, a superconducting circuit is used that stands out ...
Generalized Belief Propagation Algorithms for Decoding of Surface Codes
Josias Old, M. Rispler·Dec 6, 2022
Belief propagation (BP) is well-known as a low complexity decoding algorithm with a strong performance for important classes of quantum error correcting codes, e.g. notably for the quantum low-density parity check (LDPC) code class of random expander...
Quantum Worst-Case to Average-Case Reductions for All Linear Problems
Vahid R. Asadi, Alexander Golovnev, Tom Gur +2 more·Dec 6, 2022
We study the problem of designing worst-case to average-case reductions for quantum algorithms. For all linear problems, we provide an explicit and efficient transformation of quantum algorithms that are only correct on a small (even sub-constant) fr...
Ans\"atze for Noisy Variational Quantum Eigensolvers
Mafalda Ramôa·Dec 6, 2022
The hardware requirements of useful quantum algorithms remain unmet by the quantum computers available today. Because it was designed to soften these requirements, the Variational Quantum Eigensolver (VQE) has gained popularity as a contender for a c...
Tight Bell inequalities from polytope slices
J. Jesús, Emmanuel Zambrini Cruzeiro·Dec 6, 2022
We derive new tight bipartite Bell inequalities for various scenarios. A bipartite Bell scenario $(X,Y,A,B)$ is defined by the numbers of settings and outcomes per party, $X$, $A$ and $Y$, $B$ for Alice and Bob, respectively. We derive the complete s...
Robustness of Quantum Algorithms for Nonconvex Optimization
Weiyuan Gong, Chenyi Zhang, Tongyang Li·Dec 5, 2022
Recent results suggest that quantum computers possess the potential to speed up nonconvex optimization problems. However, a crucial factor for the implementation of quantum optimization algorithms is their robustness against experimental and statisti...
Orbital-optimized pair-correlated electron simulations on trapped-ion quantum computers
Luning Zhao, J. Goings, Kyujin Shin +8 more·Dec 5, 2022
Variational quantum eigensolvers (VQE) are among the most promising approaches for solving electronic structure problems on near-term quantum computers. A critical challenge for VQE in practice is that one needs to strike a balance between the expres...
Exploring the Limitations of Hybrid Adiabatic Quantum Computing for Emission Tomography Reconstruction
M. Nau, A. Vija, W. Gohn +2 more·Dec 2, 2022
Our study explores the feasibility of quantum computing in emission tomography reconstruction, addressing a noisy ill-conditioned inverse problem. In current clinical practice, this is typically solved by iterative methods minimizing a L2 norm. After...