July 2025 - ITP-quantumseminare - lists.phys.ethz.ch

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by Helsana Prämien 30 Jul '25

30 Jul '25

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No QIT seminar this week
by Ladina Hausmann 28 Jul '25

28 Jul '25

Hi all, There is no QIT seminar planned for this week. Best, Ladina

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Thursday's QIT seminar at 11:00 in HIT E41.1
by Ladina Hausmann 21 Jul '25

21 Jul '25

Hi all, This week, Jakob Miller will talk about “Incoherent Feedback Protocols in Timekeeping Devices: Never touch your ticking clocks?”. The talk will take place on Thursday at 11:00 in HIT E41.1. See below for the abstract. Best, Ladina %%%%%%%% Title: Incoherent Feedback Protocols in Timekeeping Devices: Never touch your ticking clocks? Abstract: From an operational perspective any physical system that allows one to measure the passage of time can be regarded as a clock. If one additionally demands that the clock is not influenced by the act of reading off the time, one is naturally lead to the formalism of ticking clocks that we introduce in this talk. In particular, we discuss ticking clocks that satisfy the properties of self-timing and clockwork independence. In order to quantify the quality of the clock’s time estimate, we study the signal-to-noise ratio. Motivated by the relevance of feedback mechanisms in atomic clocks, we propose a notion of incoherent feedback protocols for ticking clocks. We provide numeric evidence that feedback-controlled quantum clockworks can achieve fundamentally higher signal-to-noise ratios when compared to their non-controlled counterparts.

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Thursday's QIT seminar at 11:00 in HIT E41.1.
by Ladina Hausmann 15 Jul '25

15 Jul '25

Hi all, This week, Leonardo Valente will talk about “Decoherence in Quantum Reference Frames”. The talk will take place on Thursday at 11:00 in HIT E41.1. See below for the abstract. Best, Ladina **** Title: Decoherence in Quantum Reference Frames Abstract: We explore the phenomenon of decoherence and how it changes under quantum reference frame (QRF) transformations. In particular, we simulate how gravitationally induced decoherence depends on the chosen QRF. In our model, we find that if a massive particle decoheres smoothly over a finite timescale in one QRF, then from the particle’s own QRF, the decoherence appears instantaneous. We analyse this asymmetry and show, using entropy-based tools, that it does not arise from the existence of a privileged QRF. Additionally, we introduce the notion of non-entangling states — a class of states that preserve entanglement and maintain the tensor product structure under QRF transformations — as a way to keep coherence frame-independent.

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No seminar this week
by Ladina Hausmann 08 Jul '25

08 Jul '25

Hi all, There is no seminar planned for this week. Best, Ladina

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