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Long-time simulations with high fidelity on quantum hardware [article]

Joe Gibbs, Kaitlin Gili, Zoë Holmes, Benjamin Commeau, Andrew Arrasmith, Lukasz Cincio, Patrick J. Coles, Andrew Sornborger
2021 arXiv   pre-print
Here we demonstrate that, despite these limitations, it is possible to implement long-time, high fidelity simulations on current hardware.  ...  Specifically, we simulate an XY-model spin chain on the Rigetti and IBM quantum computers, maintaining a fidelity of at least 0.9 for over 600 time steps.  ...  We demonstrate these advantages by implementing long-time high fidelity quantum simulations of the 2qubit XY spin chain on Rigetti's and IBM's quantum computers.  ... 
arXiv:2102.04313v2 fatcat:cacvdr5h6nfi5f4aoxldb3g4ei

Simulating three wave interactions on quantum computers

Yuan Shi
2020 Zenodo  
Poster presented at APS DPP 2020 on using quantum hardware to simulate three-wave interactions that are relevant to plasma physics applications. Based on paper arXiv:2004.06885.  ...  Long-time evolution captured by customized gate.  ...  control pulses can achieve high fidelity ▪ Numerical optimizations expensive, shortcut by interpolation.  ... 
doi:10.5281/zenodo.4277946 fatcat:swynyjsjcfekfnwqic5ps7s7fi

SeQUeNCe: A Customizable Discrete-Event Simulator of Quantum Networks [article]

Xiaoliang Wu, Alexander Kolar, Joaquin Chung, Dong Jin, Tian Zhong, Rajkumar Kettimuthu, Martin Suchara
2020 arXiv   pre-print
We show the dependence of quantum network throughput on several key hardware parameters and study the impact of classical control message latency.  ...  We implement a comprehensive suite of network protocols and demonstrate the use of SeQUeNCe by simulating a photonic quantum network with nine routers equipped with quantum memories.  ...  Noise and loss can harm the high-fidelity entanglement required for teleportation [8] .  ... 
arXiv:2009.12000v1 fatcat:qtrtdywxbrb2fly7jf77pdy2se

Designing a quantum network protocol

Wojciech Kozlowski, Axel Dahlberg, Stephanie Wehner
2020 Proceedings of the 16th International Conference on emerging Networking EXperiments and Technologies  
One of the key challenges in near-term quantum technology is decoherence -the gradual decay of quantum information -which imposes extremely stringent limits on storage times.  ...  The second quantum revolution brings with it the promise of a quantum internet. As the first quantum network hardware prototypes near completion new challenges emerge.  ...  The authors acknowledge funding received from the EU Flagship on Quantum Technologies, Quantum Internet Alliance (No. 820445), an ERC Starting Grant (SW), and an NWO VIDI Grant (SW).  ... 
doi:10.1145/3386367.3431293 dblp:conf/conext/KozlowskiDW20 fatcat:6c3mtly4inf43l5zw7sgevr2oq

System Design for a Long-Line Quantum Repeater

R. Van Meter, T.D. Ladd, W.J. Munro, K. Nemoto
2009 IEEE/ACM Transactions on Networking  
The resulting throughput is calculated via detailed simulations of a long line composed of shorter hops.  ...  correction called purification to raise the fidelity of the quantum states.  ...  large numbers of short-distance, low-fidelity Bell pairs into smaller numbers of long-distance, high-fidelity pairs.  ... 
doi:10.1109/tnet.2008.927260 fatcat:si3feim3ejawnot7jbu3tes32m

Is quantum computing green? An estimate for an energy-efficiency quantum advantage [article]

Daniel Jaschke, Simone Montangero
2022 arXiv   pre-print
The quantum advantage threshold determines when a quantum processing unit (QPU) is more efficient with respect to classical computing hardware in terms of algorithmic complexity.  ...  Indeed, for NISQ hardware and algorithms requiring a moderate amount of entanglement, a classical tensor network emulation can be more energy-efficient at equal final state fidelity than quantum computation  ...  PRIN 2017, the EU-QuantERA projects QuantHEP and T-NISQ, and the WCRI-Quantum Computing and Simulation Center of Padova University.  ... 
arXiv:2205.12092v1 fatcat:g6l7pxjzojfprp4uqagwhdr2t4

Practical Quantum State Tomography for Gibbs states [article]

Yotam Y. Lifshitz, Eyal Bairey, Eli Arbel, Gadi Aleksandrowicz, Haggai Landa, Itai Arad
2021 arXiv   pre-print
We demonstrate the utility of this method with a high fidelity reconstruction of the density matrix of 4 to 10 qubits in a Gibbs state of the transverse-field Ising model, in numerical simulations as well  ...  However, as it cannot be directly applied to systems with more than a few qubits, efficient tomography of larger states on mid-sized quantum devices remains an important challenge in quantum computing.  ...  IA acknowledges the support of the Israel Science Foundation (ISF) under the Research Grants in Quantum Technologies and Science No. 2074/19, and the joint NRF-ISF Research Grant No. 3528/20.  ... 
arXiv:2112.10418v1 fatcat:zwsslz5psfbubmjcb2bqohkjru

Quantum computers as universal quantum simulators: state-of-art and perspectives [article]

Francesco Tacchino, Alessandro Chiesa, Stefano Carretta, Dario Gerace
2019 arXiv   pre-print
First, we give a broad overview on the basic theoretical background pertaining digital quantum simulations, with a focus on the hardware-dependent mapping of spin-type Hamiltonians into the corresponding  ...  In particular, quantum computing platforms based on either trapped ions or superconducting qubits have become available for simulations and benchmarking, with up to few tens of qubits that can be reliably  ...  A summary of the fidelity obtained from these quantum simulations on the same quantum hardware with up to 5 Trotter steps is also reported from the original reference [93] .  ... 
arXiv:1907.03505v1 fatcat:rnx37ywr3jagzezlz44b7nf3qu

A Small, Highly Accurate Quantum Processor for Intermediate-Depth Quantum Simulations [article]

Nathan K. Lysne, Kevin W. Kuper, Pablo M. Poggi, Ivan H. Deutsch, and Poul S. Jessen
2020 arXiv   pre-print
Here we describe a small, highly accurate quantum simulator and its use to run high fidelity simulations of three different model Hamiltonians for >100 time steps.  ...  If based on current noisy hardware, the accuracy of an analog simulator will degrade after just a few time steps, especially when simulating complex systems that are likely to exhibit quantum chaos.  ...  In all cases the simulation fidelity declines smoothly with time but remains well above that of a mixed state, Each AQS extends over 1 ≤ k ≤ 40 time steps, enough to densely sample for long enough that  ... 
arXiv:1911.02694v2 fatcat:3jt7daqljfbrbpljltgqxi2lqe

Fractal fidelity as a signature of quantum chaos

Franco Pellegrini, Simone Montangero
2007 Physical Review A. Atomic, Molecular, and Optical Physics  
We analyze the fidelity of a quantum simulation and we show that it displays fractal fluctuations iff the simulated dynamics is chaotic.  ...  We conjecture that fidelity fractal fluctuations are a signature of the appearance of quantum chaos. Our analysis can be realized already by a few qubit quantum processor.  ...  Indeed, the quantum simulation of quantum chaotic systems is possible and some efficient algorithms, with respect to known classical ones, have been found [2, 3, 4] .  ... 
doi:10.1103/physreva.76.052327 fatcat:gndus2r6u5a2dgmlu6azrs3h7q

Designing a Quantum Network Protocol [article]

Wojciech Kozlowski, Axel Dahlberg, Stephanie Wehner
2020 arXiv   pre-print
The second quantum revolution brings with it the promise of a quantum internet. As the first quantum network hardware prototypes near completion new challenges emerge.  ...  One of the key challenges in near-term quantum technology is decoherence -- the gradual decay of quantum information -- which imposes extremely stringent limits on storage times.  ...  The authors acknowledge funding received from the EU Flagship on Quantum Technologies, Quantum Internet Alliance (No. 820445), an ERC Starting Grant (SW), and an NWO VIDI Grant (SW).  ... 
arXiv:2010.02575v1 fatcat:q4qeo2nhhjaanchtyy4jqqseau

Architecting Noisy Intermediate-Scale Trapped Ion Quantum Computers [article]

Prakash Murali, Dripto M. Debroy, Kenneth R. Brown, Margaret Martonosi
2020 arXiv   pre-print
Trapped ions (TI) are a leading candidate for building Noisy Intermediate-Scale Quantum (NISQ) hardware.  ...  Our toolflow maps the applications onto the target device and simulates their execution to compute metrics such as application run time, reliability and device noise rates.  ...  Communication time decreases with high trap capacity, while computation time increases because of higher gate time in large traps.  ... 
arXiv:2004.04706v1 fatcat:4vugl4cwpzg6rb65nxeozqzi3m

Design of a Quantum-Repeater using Quantum-Circuits and benchmarking its performance on an IBM Quantum-Computer [article]

Sowmitra Das, Md. Saifur Rahman, Mahbubul Alam Majumdar
2020 arXiv   pre-print
hardware.  ...  These enable one to establish long-range entanglement by dividing the link into smaller parts, creating entanglement between each part and connecting them up to form the full link.  ...  Two neighbouring high-fidelity links are then connected by using the entanglement swapping protocol to generate a link twice as long as the original one.  ... 
arXiv:2009.04584v1 fatcat:igcj2ir5mzffdka4qowp7ss6ha

Application-Oriented Performance Benchmarks for Quantum Computing [article]

Thomas Lubinski, Sonika Johri, Paul Varosy, Jeremiah Coleman, Luning Zhao, Jason Necaise, Charles H. Baldwin, Karl Mayer, Timothy Proctor
2021 arXiv   pre-print
These benchmarks probe a quantum computer's performance on various algorithms and small applications as the problem size is varied, by mapping out the fidelity of the results as a function of circuit width  ...  In addition to estimating the fidelity of results generated by quantum execution, the suite is designed to benchmark certain aspects of the execution pipeline in order to provide end-users with a practical  ...  Application-Oriented Performance Benchmarks for Quantum Computing October 8, 2021  ... 
arXiv:2110.03137v2 fatcat:3kcop57gzbgrvkubxx235s7kjm

Minimum hardware requirements for hybrid quantum–classical DMFT

B Jaderberg, A Agarwal, K Leonhardt, M Kiffner, D Jaksch
2020 Quantum Science and Technology  
We thus find quantum-classical DMFT calculations can be run on the next generation of NISQ devices if combined with the recompilation techniques developed in this work.  ...  By comparison, the quantum-classical algorithm without circuit recompilation requires a two-qubit gate fidelity of at least 99.999% to achieve perfect agreement with the exact solution.  ...  Acknowledgments We acknowledge support from the EPSRC National Quantum Technology Hub in Networked Quantum Information Technology (EP/M013243/1) and the EPSRC Hub in Quantum Computing and Simulation (EP  ... 
doi:10.1088/2058-9565/ab972b fatcat:nvq5xfge4jfdzf5exoxq6bwoou
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