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Physics Letters A

The adiabatic monitoring of quantum objects

Timothy P. Spiller, Terrence D. Clark, Robert J. Prance, Helen Prance

Published Nov 1, 1992• 10 citations
Publisher
DOI
10.1016/0375-9601(92)90253-i

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An ever broader range of physical platforms provides the possibility to study and engineer quantum dynamics under continuous measurements. In many experimental arrangements the system of interest is monitored by means of an ancillary device, whose sole purpose is to transduce the signal from the system to the measurement apparatus. Here we present a method of adiabatic elimination when the transducer consists of an arbitrary number of bosonic modes with Gaussian dynamics while the measured object can be any quantum system. Crucially, our approach can cope with the highly relevant case of finite temperature of the transducer, which is not easily achieved with other methods. We show that this approach provides a significant improvement in the readout of superconducting qubits in circuit QED already for a few thermal excitations and makes it possible to adiabatically eliminate optomechanical transducers relevant for frequency conversion between microwave and optical fields.
The paper discusses application of long-range signal transmission system for distant monitoring of entangled macro-objects. The 'activity index' is introduced as a characteristic of distant objects and its meaning is analysed for different experimental and environmental conditions. Probabilistic parameters of non-local measurements, methods for increasing their reproducibility and reliability, as well as various configurations of the measuring system are described. The results of calibration and control experiments with geographic, physical, biological and symbolic objects are represented. The system enables testing entangled macro-objects on possessing specific features/properties measured by multiple devices in parallel. Distant monitoring can be used as part of a system conducting interactions with biological objects, as well as for independent usage as diagnostic or surveillance equipment.
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.