38,40. The second and more catastrophic failure mode manifests as many detectors simultaneously experiencing a larger spike in the detection probability; an example is shown in Fig. 3b. Notably, these anisotropic error bursts are spatially localized to neighbourhoods of roughly 30 qubits (Fig. 3b...
Weak limit (g→ 0): The system fails to couple to the detectors. The bound (26) reduces to minw2{−log(pj1Vpj2VTr(Πw2W))}. The probability distribution {pjℓV} has a spread quantified by the Shannon entropy HSh({pjℓV}). The left-hand side of Eq. (24) reduces to 2[...
the fact that Alice and Bob should be spacelike separated so that the choice of measurements cannot influence one another, was first closed after the ’80s [318,319]. On the other hand, the detection loophole [320,321], which is related to the inefficiencies of detectors, was closed in ...
Various approaches have been developed to ensure correct evaluation of the smooth min-entropy bounds obtained from the finite raw key, such as the exponential de Finetti theorem [476,477], post-selection technique [478], virtual entanglement distillation [479], entropic uncertainty relations [480,...
Thanks to Moore’s Law, it becomes possible to create complex digital signal processing on chip side-by-side with, or under the detectors, thus minimizing noise and jitter. Proximity of detection and processing maximizes compactness, while reducing power dissipation due to the lack of expensive an...
we have enough privileged information about the quantum state to determine what would happen if we had finished the experiment earlier. For an experiment withnrounds, we can provide the result of data-qubit measurements, and consequently alternative ‘last rounds’ of detectors and logical observable...
In addition to measurement noise, detectors can be inaccurate, and outside interference can cause measurement bits to flip. Based on the results of Fig. 5, several different measurement bit strings are received after the circuit has been run for 1024 shots. However, it should be noted that ...
The team created their source of squeezed light using a mirror that oscillates under radiation pressure, but displays little thermal fluctuation, even at room temperature. Their approach could soon be used to boost the performance of gravitational wave detectors. When researchers make measurements on ...
This can be preparation noise (e.g., due to imperfections in the optical switches/modulators or coming from the natural thermal background at lower frequencies19–23) as well as measurement noise and inefficiencies affecting the detectors (which could be genuine or even added by the honest ...
Optimal control for quantum detectors Article Open access 25 March 2021 Implementation of a canonical phase measurement with quantum feedback Article 20 July 2020 References Wiseman, H. M. Quantum theory of continuous feedback. Phys. Rev. A 49, 2133–2150 (1994) Article ADS CAS Google Scho...