Odd thermodynamic limit for the Loschmidt echo

Abstract

Is it possible to readily distinguish a system made by an Avogadro's number of identical elements and one with a single additional one? Usually, the answer to this question is negative but, in this work, we show that in antiferromagnetic quantum spin rings a simple out-of-equilibrium experiment can do so, yielding two qualitatively and quantitatively different outcomes depending on whether the system includes an even or an odd number of elements. We consider a local quantum-quench setup and calculate a generating function of the work done, namely, the Loschmidt echo, showing that it displays different features depending on the presence or absence of topological frustration, which is triggered by the even/oddness in the number of the chain sites. We employ the prototypical quantum Ising chain to illustrate this phenomenology, which we argue being generic for antiferromagnetic spin chains, as it stems primarily from the different low energy spectra of frustrated and non frustrated chains. Our results thus prove that these well-known spectral differences lead indeed to distinct observable characteristics and open the way to harvest them in quantum thermodynamics protocols.

10 pages, 3 figures. Updated to published version

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• Towards a phase diagram of the topologically frustrated XY chain
• Random unitaries, Robustness, and Complexity of Entanglement
• Interplay between local and non-local frustration in the 1D ANNNI chain I -- The even case
• Quantum Coherence of Topologically Frustrated Spin Chains
• Few-body precursors of topological frustration
• Finite time path field theory and a new type of universal quantum spin chain quench behavior
• Finite time path field theory perturbative methods for local quantum spin chain quenches
• Numerically efficient unitary evolution for Hamiltonians beyond nearest-neighbors
• Quantum cluster kink and ring frustration