Getting the atoms into an entangled state
more quickly would be a potential advantage in any practical application, not least because entanglement can be fleeting.
I'll begin by examining several cases including finally the case of a two-qubit entangled state
together with a qubit in a CTC.
On the one hand, we have already pointed out that, although for pure states entanglement and nonlocality are equivalent, (in the sense that every entangled state
is nonlocal and vice versa) this is not the case for general mixed states.
Quantum lithography (68) is a method to overcome this limit completely, because the resolution limit for the N-photon entangled state
is reduced to 6/2N.
The authors analyze also the inverse problem: the fact that the appearance of entanglement depends on the choice of degrees of freedom can find an interesting application in the "disentanglement" of a state; one can, sometimes, transform an entangled state
into a factorizable one by a judicious choice of the degrees of freedom.
If rm can be prepared in an indeterminate state between up and down positions, then what results is the following entangled state
between photon and mirror [cf.
In particular, coherent evolution of two quantum bits (qubits) in an entangled state
of the Bell type (Bell, 1987; Bell, 1964; Aspect et al.
The entangled state
that was distributed among the three observers acts like a Rosetta stone: it's an intermediate language that all three observers share that enables them to communicate unknown information.
Certain interactions have the effect of generating pairs of electrons in an entangled state
known as the singlet state.
The matter constituents in the entangled state
retain the ability to interact with external photon fields including entangled photon fields of other quantum entities.
The photons pass through each clock and interact with the clock's atoms, passing on the entangled state
To create the entangled state
of the two atomic clouds the researchers use light.