Soul > Part III > Chapter 37 > Quantum Entanglement

Quantum entanglement is a phenomenon in which the quantum states of each particle (e.g., photon or atom) in a group are coherent or correlated. If two particles are entangled, their quantum states depend on one another. Measurement of one particle will determine the exact state of the other. Entangled photons can be observed in the HOM experiment when two photons arrive at the beam splitter simultaneously. Entanglement of multiple photons is important for the development of photon-based quantum computers. To date, up to 12-photon entanglement has been achieved (Wang et al, 2016; Zhong et al., 2018).

Images

Figure 37e. Observation of entangled photons in the HOM experiment by using single-photon-sensitive intensified cameras. Note that in most cases the two photons appear together either on the left or right side, corresponding to two output ports of a beam splitter. [Source: Wikipedia]

Recently, a growing body of evidence suggests that the gravitational force plays a critical role in quantum entanglement and coherence (Marletto and Vedral, 2017; Krisnanda et al., 2019; Ghoshal et al., 2020). Further details are discussed in the next section.

 

Author: Frank Lee
Posted on: 2020-09-15