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Matthias Rosenkranz @mrosenkranz.bsky.social · 14d

To be fair, the DQI paper didn't claim an advantage for Maxcut but suggested one for a different problem

Matthias Rosenkranz @mrosenkranz.bsky.social · Sep 2

Our paper elucidating resources required for quantum Gibbs state preparation via Lindblad simulation is now published in @quantum-journal.bsky.social

quantum-journal.org/papers/q-202...

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Reposted by Matthias Rosenkranz

Ross Duncan @rossquantum.bsky.social · Aug 20

🧵 1/? Today #quantinuum announced Guppy, the new programming language my team has been developing, and Selene the new simulator that goes with it. This is the software stack that supports our new Helios #quantum computer, and it successors. #quantumcomputing

www.quantinuum.com/blog/built-f...

Built for All: Introducing Our New Software Stack

Our next-generation quantum computer, Helios, will come online this year as more than a new chip. It will arrive as a full-stack platform that sets a new standard for the industry.

www.quantinuum.com

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Reposted by Matthias Rosenkranz

Ansis Rosmanis @arosmanis.bsky.social · Aug 7

Our latest paper is out. In a joint work with Marcello Benedetti and Matthias Rosenkranz ( @mrosenkranz.bsky.social ) , we present a new quantum algorithm for solving Lyapunov equations.
scirate.com/arxiv/2508.0...
arxiv.org/abs/2508.04689

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Matthias Rosenkranz @mrosenkranz.bsky.social · Jun 11

We have an opening for a research scientist in the quantum algorithms team at Quantinuum. This is permanent in London or Cambridge, UK. Details: jobs.eu.lever.co/quantinuum/2...

Quantinuum - Research Scientist, Quantum Algorithms

We are seeking a Research Scientist for our quantum algorithms team in London or Cambridge, UK. Our team leads the development, implementation, simulation, and application of quantum algorithms for co...

jobs.eu.lever.co

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Reposted by Matthias Rosenkranz

Ross Duncan @rossquantum.bsky.social · May 16

What's this? Some very nice work by my colleagues.
#quantinuum #quantumcomputing #ftqc #quantum
arxiv.org/abs/2505.09133

Quantum Error-Corrected Computation of Molecular Energies

We present the first demonstration of an end-to-end pipeline with quantum error correction (QEC) for a quantum computation of the electronic structure of molecular systems. Using Quantinuum H2-2, we c...

arxiv.org

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Matthias Rosenkranz @mrosenkranz.bsky.social · Apr 10

Happy that our paper on state preparation for multivariate functions is out in @quantum-journal.bsky.social. We've also open sourced the code. Give it a go in your algorithm: github.com/CQCL/mvsp

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Reposted by Matthias Rosenkranz

Cristina Cirstoiu @cristinacirstoiu.bsky.social · Mar 30

Hi #quantum bluesky 👋 In arxiv.org/abs/2503.20870 with #Quantinuum, Fermioniq, Caltech, EPFL, TUM we show Quantinuum's H2 ion-trap #quantumcomputer can simulate dynamical evolution of a 2D Ising model at late times and sizes pushing beyond classical means(MPS, PEPS, sparse Pauli propagation, NN).

Digital quantum magnetism at the frontier of classical simulations

The utility of near-term quantum computers for simulating realistic quantum systems hinges on the stability of digital quantum matter--realized when discrete quantum gates approximate continuous time ...

arxiv.org

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Matthias Rosenkranz @mrosenkranz.bsky.social · Feb 14

Here's one from our algorithms team and QuSoft/CWI

arxiv quant-ph @arxiv-quant-ph.bsky.social · Feb 14

Marcello Benedetti, Harry Buhrman, Jordi Weggemans
Complement Sampling: Provable, Verifiable and NISQable Quantum Advantage in Sample Complexity
https://arxiv.org/abs/2502.08721

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Reposted by Matthias Rosenkranz

Charlie Baldwin @chbaldwin.bsky.social · Feb 4

If you’re running randomized benchmarking on your quantum computer, stop and read our paper!

arxiv.org/pdf/2502.00154

arxiv.org

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Reposted by Matthias Rosenkranz

qctip2025.bsky.social @qctip2025.bsky.social · Jan 6

The deadline for talk submissions at QCTiP 2025 is coming up! Consider submitting a talk until January 10.

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Matthias Rosenkranz @mrosenkranz.bsky.social · Dec 24

We see this is a step towards implementing recent quantum Gibbs sampling algorithms on quantum hardware.

Many thanks for the fantastic work to my co-authors Eric Brunner, Luuk Coopmans, Gabriel Matos, Fred Sauvage and Yuta Kikuchi, all @quantinuum.bsky.social

Matthias Rosenkranz @mrosenkranz.bsky.social · Dec 24

Finally, we analyse algorithmic errors by simulating the full quantum circuits. Circuit simulations with a noise model confirm the trade-off between algorithmic errors and noise, whereby a larger Trotter time step can lead to smaller overall error.

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Matthias Rosenkranz @mrosenkranz.bsky.social · Dec 24

Then we analyse analytically and numerically convergence, mixing time, spectral gap etc. for a mixed-field Ising model and random k-local Pauli jump operators. We also find a certain noise resilience of the protocol at relevant error rates

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Matthias Rosenkranz @mrosenkranz.bsky.social · Dec 24

We propose a simplified Lindblad simulation algorithm combining various earlier ideas, e.g. the Chen et al. quantum thermal state preparation algorithm, QDrift-like randomized jump operators, a single-ancilla protocol for the dissipative term, ETH for good convergence and simpler coherent term etc.

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Matthias Rosenkranz @mrosenkranz.bsky.social · Dec 24

Very happy that our new paper on quantum Gibbs state preparation is out today 🎅

scirate.com/arxiv/2412.1...

We hope this bridges the gap between the recent theoretical advances in Lindblad simulation algorithms for quantum Gibbs sampling and their eventual quantum hardware implementation.

Lindblad engineering for quantum Gibbs state preparation under the eigenstate thermalization hypothesis

Building upon recent progress in Lindblad engineering for quantum Gibbs state preparation algorithms, we propose a simplified protocol that is shown to be efficient under the eigenstate thermalization...

scirate.com

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Reposted by Matthias Rosenkranz

anthony-leverrier.bsky.social @anthony-leverrier.bsky.social · Dec 11

Interesting question by Mark Wilde on Twitter:
There have been many breakthrough algorithms for thermal state preparation recently. Does any of them prepare a canonical purification of a thermal state? i.e, the following state
(\sqrt{e^{-H}/Z} ⊗ I) ∑_i |i⟩ ⊗ |i⟩
with |i⟩ = computational basis

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Matthias Rosenkranz @mrosenkranz.bsky.social · Dec 9

I would include Spiti Valley (Himachal Pradesh, India).

Besides the spectacular landscape, places like Tabo Monastery hold beautiful frescoes some of which date to ~1000 CE

Overlooking a snow-covered landscape with white mountains in the background and Tibetan prayer flags on a pole in the foreground

Key Gompa (monastery) against a mountain backdrop

A turquoise Spiti river running through a valley with shrubs on the left and snow-capped mountains in the distance

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Reposted by Matthias Rosenkranz

qctip2025.bsky.social @qctip2025.bsky.social · Dec 5

Submissions for QCTiP 2025 are now open.

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Matthias Rosenkranz @mrosenkranz.bsky.social · Dec 2

Thank you

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Reposted by Matthias Rosenkranz

anthony-leverrier.bsky.social @anthony-leverrier.bsky.social · Dec 2

it will be interesting to see whether this "classical attack" gives anything for the "optimization by decoded quantum interferometry" paper
arxiv.org/abs/2408.08292

Optimization by Decoded Quantum Interferometry

We introduce Decoded Quantum Interferometry (DQI), a quantum algorithm for reducing classical optimization problems to classical decoding problems by exploiting structure in the Fourier spectrum of th...

arxiv.org

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Reposted by Matthias Rosenkranz

anthony-leverrier.bsky.social @anthony-leverrier.bsky.social · Dec 2

The plot thickens:
"While all the proofs in the paper are correct to the best of our knowledge, we have been recently informed about a classical attack on our polynomial system."

anthony-leverrier.bsky.social @anthony-leverrier.bsky.social · Nov 25

When it rains new quantum algorithms with a potential advantage, it pours:
arxiv.org/abs/2411.14697

Quantum Advantage via Solving Multivariate Quadratics

In this work, we propose a new way to (non-interactively, verifiably) demonstrate Quantum Advantage by solving the average-case $\mathsf{NP}$ search problem of finding a solution to a system of (under...

arxiv.org

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Matthias Rosenkranz @mrosenkranz.bsky.social · Dec 1

Yes please.

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Matthias Rosenkranz @mrosenkranz.bsky.social · Nov 30

Book cover of Quantum Computation and Quantum Information by Nielsen and Chuang

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Matthias Rosenkranz @mrosenkranz.bsky.social · Nov 29

Pure statesman

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