Fig. 2: Quantum correlations in the particles and in the detector. (a,b). | npj Quantum Information

Fig. 2: Quantum correlations in the particles and in the detector. (a,b).

From: Many-body entanglement via ‘which-path’ information

Fig. 2

Particle correlations: Comparing the “which-path” variants with classical (a) and quantum (b) detectors. The probability to measure n of the total k = 6 particles in the \(\left\vert 0\right\rangle\) state is presented as a function of the particle-detector coupling strength g (a1, b1), showing strong anti-correlations in the limit of strong coupling (a2, b2). c Detector correlations: The state of the quantum detector (a quantum harmonic oscillator) presented in the p (c1) and x (c2) quadratures, as a function of the coupling strength, post-selected on all particles measured in the \(\left\vert 0\right\rangle\) state. The Wigner function in the limit of strong coupling (c3) is highly non-Gaussian, taking the form of a (GKP-like) grid of coherent states.

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