Daniel Malz
@danielmalz
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Theoretical physicist, interested in quantum optics, quantum information, and quantum technologies. Assistant Professor at the University of Copenhagen
Copenhagen
Joined July 2009
RT @LPacchiardi: [🌎English version].📢 Introducing 🌐 a website for finding a job in Italian universities and researc….
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For more percolation, 2D state to 1+1D dynamics mappings, and nice tensor pictures, head to our preprint at I've had a great time putting this together with Rahul Trivedi! 🙌. 🧵 5/5.
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What about sampling from the whole state?. Sampling maps to monitored quantum circuit dynamics, which is known to undergo measurement-induced phase transitions to easy phases. We can construct a family of states interpolating from a provably hard to an easy phase. 🧵 4/5.
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Computing local expectation values in isoTNS requires simulating a 1D circuit of channels. Forcing isoTNS to be ground states of a local Hamiltonian adds depolarizing noise to this circuit, which eventually drives it to an easy phase. 🧵 3/5.
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Without restrictions, isoTNS are BQP-complete (you can make them run any quantum circuit). However, when we force them to be ground states of local frustration free Hamiltonians, they eventually undergo a phase transition to an easy phase!. Why? . 🧵2/5.
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📢 new preprint: Computational complexity of isometric tensor network states. IsoTNS are versatile variational states, but how easy is it to compute their properties?. We relate this to widely studied complexity transitions in quantum dynamics . 🧵 1/5.
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RT @skdh: I've been working on a video about net zero -- what is it, how will we get there, how far are we along the way, etc. Just finishe….
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RT @AlhambraAlvaro: We at the Quantum group @ift_uam_csic are offering a 2-year postdoc, to work on a wide range of topics on quantum matt….
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There are many open positions to join the vibrant Copenhagen research community, including in my group. Apply by 15th Nov!.
We are looking for PhD students interested in the mathematical theory of quantum mechanics and quantum computation at QMATH in Copenhagen! Applications go through the call
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RT @KnorzerJohannes: Excited to co-organise the 804th #HeraeusSeminar with Jasmin Meinecke & Matthias Zimmermann! Focus on #quantumcomputin….
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it's been a really fun and exciting collaboration together with Zhi-Yuan Wei, Yorgos Styliaris and Ignacio Cirac!.
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If you add measurement + feedback, the preparation time is exponentially reduced from log N to loglog N, and you can prepare long-range correlated (non-normal MPS) in the same depth.
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Our circuits are simple and intuitive, and (probably) have little overhead, so that circuit depth is considerably reduced from linear circuits, already for small systems.
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📢 new preprint just out: Preparation of matrix product states with log-depth quantum circuits. We give an explicit circuit to prepare normal MPS (aka unique ground states of local gapped Hamiltonians) and prove it's asymptotically optimal.
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RT @QMATH_KU: A tenure track position on Quantum Algorithms for Chemistry and Life Sciences at the Chemistry Department of the University o….
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RT @PhysRevResearch: Efficient adiabatic preparation of tensor network states, Zhi-Yuan Wei, Daniel Malz, and J. Ignacio Cirac #Quantum #Qu….
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RT @QMATH_KU: Join us Aug 21-25, 2023 for a masterclass on quantum learning theory! Explore efficient use of quantum resources & capabiliti….
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RT @PRX_Quantum: A proposal based on state-of-the-art quantum simulators shows how to explore long-range interactions so that central pheno….
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RT @NEQphysics: I am looking for a postdoc and PhD student to join my group at NBI Copenhagen and work on non-equilibrium quantum physics.….
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