Abstract
Nonlocal measurement, or instantaneous measurement of nonlocal observables, is a considerably difficult task even for a simple form of product observable, since relativistic causality prohibits interaction between spacelike separate subsystems. Following a recent proposal for effectively creating the von Neumann measurement Hamiltonian of nonlocal observables [Phys. Rev. Lett. 116, 070404 (2016) [CrossRef] ], here we report a proof-of-principle demonstration of nonlocally measuring a product observable using linear optics without the violation of relativistic causality. Our scheme provides a feasible approach to perform nonlocal measurements via quantum erasure with linear optics.
| Original language | Others/Unknown |
|---|---|
| Pages (from-to) | 1199-1202 |
| Number of pages | 4 |
| Journal | Optica |
| Volume | 6 |
| Issue number | 9 |
| Publication status | Published - 2019 |
| Externally published | Yes |