Abstract
Interaction-free measurement (IFM) is a surprising consequence of quantum interference, where the presence of objects can be sensed without any disturbance of the object being measured. Here, we show an extension of IFM using techniques from spatial adiabatic passage, specifically multiple recipient adiabatic passage. Due to subtle properties of the adiabatic passage, it is possible to image an object without interaction between the imaging photons and the sample. The technique can be used on multiple objects in parallel and is entirely deterministic in the adiabatic limit. Unlike more conventional IFM schemes, this adiabatic process is driven by the symmetry of the system, and not by more usual interference effects. As such it provides an interesting alternative quantum protocol that may be applicable to photonic implementations of spatial adiabatic passage. We also show that this scheme can be used to implement a collision-free quantum routing protocol.
Highlights
One of the counter-intuitive effects of quantum mechanics is that of interaction-free measurement (IFM)
To illustrate IFMs we summarise the canonical IFM: the ‘quantum bomb’ problem
We show an application of this protocol to the task of parallel IFM in the quantum minefield problem
Summary
One of the counter-intuitive effects of quantum mechanics is that of interaction-free measurement (IFM). Instead of relying on interferometry to perform the measurement, we use the symmetry of the problem, in particular the composition of the null space of the solution to the adiabatic network, as will be described below This gives a fundamentally different approach to the task of IFM, which gives rise quite naturally to parallel search with robustness and deterministic sensing. Advances in the construction of quantum systems have allowed new perspectives in adiabatic passage, in particular the opportunity the to move particles adiabatically through space To explain this we first discuss CTAP as a precursor adiabatic passage protocol, before showing how this can be extended to multiple recipients. We show how this protocol can be converted into collision-free quantum routing technique
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