Papers
Live trends in quantum computing research, updated daily from arXiv.
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Quantum search in a non-Markovian environment
Sheikh Parvez Mandal·Mar 23, 2023
This MS thesis explores the effects and origins of a 'noise with memory' in the dynamics of an open quantum system. The system considered here is a multi-qubit register performing the Grover's quantum search algorithm. We show that a Markovian-correl...
Experimental Implementation of Short-Path Nonadiabatic Geometric Gates in a Superconducting Circuit
Xinxin Yang, Liang-Liang Guo, Haifeng Zhang +8 more·Mar 22, 2023
The non-adiabatic geometric quantum computation (NGQC) has attracted a lot of attention for noise-resilient quantum control. However, previous implementations of NGQC require long evolution paths that make them more vulnerable to incoherent errors th...
Dissipative ground state preparation and the Dissipative Quantum Eigensolver
T. Cubitt·Mar 21, 2023
For any local Hamiltonian H, I construct a local CPT map and stopping condition which converges to the ground state subspace of H. Like any ground state preparation algorithm, this algorithm necessarily has exponential run-time in general (otherwise ...
Opening the Black Box inside Grover’s Algorithm
E. Stoudenmire, X. Waintal·Mar 20, 2023
Grover’s algorithm is one of the primary algorithms offered as evidence that quantum computers can provide an advantage over classical computers. It involves an “oracle” (external quantum subroutine), which must be specified for a given application a...
Distributed exact quantum algorithms for Bernstein-Vazirani and search problems
Xu Zhou, Daowen Qiu, L. Lou·Mar 19, 2023
Distributed quantum computation has gained extensive attention since small-qubit quantum computers seem to be built more practically in the noisy intermediate-scale quantum (NISQ) era. In this paper, we give a distributed Bernstein-Vazirani algorithm...
Hybrid Error-Management Strategies in Quantum Repeater Networks
Poramet Pathumsoot, Theerapat Tansuwannont, Naphan Benchasattabuse +5 more·Mar 18, 2023
A quantum network is expected to enhance distributed quantum computing and quantum communication over a long distance while providing unconditional security. As quantum entanglement is essential for a quantum network, major issues from various types ...
Estimating Coherent Contributions to the Error Profile Using Cycle Error Reconstruction
Arnaud Carignan-Dugas, S. Ranu, P. Dreher·Mar 17, 2023
Mitigation and calibration schemes are central to maximize the computational reach of today's Noisy Intermediate Scale Quantum (NISQ) hardware, but these schemes are often specialized to exclusively address either coherent or decoherent error sources...
Fano-qubits for quantum devices with enhanced isolation and bandwidth
Deepanshu Trivedi, L. Belostotski, A. Madanayake +1 more·Mar 17, 2023
Quantum devices often suffer from reflections and noise during readout, a problem traditionally addressed by magneto-optical isolators and circulators. However, these solutions are hindered by limited bandwidth, low tunability, high losses, and incom...
Scalable spin squeezing in a dipolar Rydberg atom array
G. Bornet, G. Emperauger, Cheng Chen +11 more·Mar 14, 2023
In the dipolar XY model, quench dynamics from a polarized initial state lead to spin squeezing that improves with increasing system size, and two refinements show further enhanced squeezing and extended lifetime of the squeezed state by freezing its ...
Leveraging hardware-control imperfections for error mitigation via generalized quantum subspace
Yasuhiro Ohkura, Suguru Endo, Takahiko Satoh +2 more·Mar 14, 2023
In the era of quantum computing without full fault-tolerance, it is essential to suppress noise effects via the quantum error mitigation techniques to enhance the computational power of the quantum devices. One of the most effective noise-agnostic er...
Training variational quantum algorithms with random gate activation
Shuo Liu, Shi-Xin Zhang, Shao-Kai Jian +1 more·Mar 14, 2023
Variational quantum algorithms (VQAs) hold great potentials for near-term applications and are promising to achieve quantum advantage on practical tasks. However, VQAs suffer from severe barren plateau problem as well as have a large probability of b...
Significant improvement of fidelity for encoded quantum bell pairs at long and short-distance communication along with generalized circuit
Syed Emad Uddin Shubha, MD Saifur Rahman, Mahdy M.R.C·Mar 13, 2023
Quantum entanglement is a unique criterion of the quantum realm and an essential tool to secure quantum communication. Ensuring high-fidelity entanglement has always been a challenging task owing to interaction with the hostile channel environment cr...
Improved quantum error correction with randomized compiling
Aditya Jain, Pavithran Iyer, S. Bartlett +1 more·Mar 13, 2023
Current hardware for quantum computing suffers from high levels of noise, and so to achieve practical fault-tolerant quantum computing will require powerful and efficient methods to correct for errors in quantum circuits. Here, we explore the role an...
Estimate Distillable Entanglement and Quantum Capacity by Squeezing Useless Entanglement
Chengkai Zhu, Chenghong Zhu, Xin Wang·Mar 13, 2023
Quantum Internet relies on quantum entanglement as a fundamental resource for secure and efficient quantum communication, reshaping data transmission. In this context, entanglement distillation emerges as a crucial process that plays a pivotal role i...
Optimizing quantum noise-induced reservoir computing for nonlinear and chaotic time series prediction
D. Fry, Amol Deshmukh, Samuel Yen-Chi Chen +2 more·Mar 9, 2023
Quantum reservoir computing is strongly emerging for sequential and time series data prediction in quantum machine learning. We make advancements to the quantum noise-induced reservoir, in which reservoir noise is used as a resource to generate expre...
Quantum-enhanced greedy combinatorial optimization solver
M. Dupont, B. Evert, Mark Hodson +13 more·Mar 9, 2023
Combinatorial optimization is a broadly attractive area for potential quantum advantage, but no quantum algorithm has yet made the leap. Noise in quantum hardware remains a challenge, and more sophisticated quantum-classical algorithms are required t...
Harnessing Quantumness of States using Discrete Wigner Functions under (non)‐Markovian Quantum Channels
Jai Lalita, K. G. Paulson, Subhashis Banerjee·Mar 9, 2023
The negativity of the discrete Wigner functions (DWFs) is a measure of non‐classicality and is often used to quantify the degree of quantum coherence in a system. The study of Wigner negativity and its evolution under different quantum channels can p...
Adaptive quantum error mitigation using pulse-based inverse evolutions
Ivan Henao, Jader P. Santos, R. Uzdin·Mar 9, 2023
Quantum Error Mitigation (QEM) enables the extraction of high-quality results from the presently-available noisy quantum computers. In this approach, the effect of the noise on observables of interest can be mitigated using multiple measurements with...
Quantum simulation of colour in perturbative quantum chromodynamics
Herschel A. Chawdhry, M. Pellen·Mar 8, 2023
Quantum computers are expected to give major speed-ups for the simulation of quantum systems. In this work, we present quantum gates that simulate the colour part of the interactions of quarks and gluons in perturbative quantum chromodynamics (QCD). ...
Measurement-induced entanglement and teleportation on a noisy quantum processor
Jesse C. Hoke, Matteo Ippoliti, D. Abanin +160 more·Mar 8, 2023
Measurement has a special role in quantum theory^ 1 : by collapsing the wavefunction, it can enable phenomena such as teleportation^ 2 and thereby alter the ‘arrow of time’ that constrains unitary evolution. When integrated in many-body dynamics, mea...