Philosophers
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Tim Maudlin
Tim Maudlin is a philosopher of science at New York University.
In the three editions of his first book Quantum NonLocality and Relativity (19942011), Maudlin describes the EPR Paradox and Bell's Theorem in great detail. In his most recent book, Philosophy of Physics: Quantum Theory (2019), he returns to summarize the situation with entangled particles... Einstein, Podolsky, and Rosen never took the possibility of such a nonlocal physical interaction between the socks (or the electrons) seriously. In fact, they thought the idea so absurd that they never imagined anyone would entertain it. What the EPR article pointed out was that to avoid such a strange “spooky action at adistance” (in Einstein's famous phrase), one has to postulate that the two electrons described above have definite dispositions concerning how they would react to the magnets from the moment they are produced and separate from each other. One of the electrons has to be zspin up and the other zspin down from the outset. Otherwise, how could either be sensitive to the behavior of the other in the right way to preserve the perfect anticorrelation? In the final pages of the 2011 edition of Quantum NonLocality and Relativity, Maudlin explained that the quantum state of a "composite system" of entangled electrons (or photons) can not be described as the product of the individual states of the two particles. In 1935 Erwin Schrödinger reacted to the EPR paper by telling Albert Einstein there was a flaw in Einstein's separability argument about the EPR Paradox. Einstein assumed that the particles could "separate" as they travel away from each other and become independent, singleparticle quantum states. Schrödinger said that Einstein's "separability principle" (Trennungsprinzip) was simply wrong. The correct "wave function" that "entangles" two particles with one another (as describable by Schrödinger's wave equation) is a twoparticle, interdependent wave function . Only after a measurement "collapses" the twoparticle wave function can the particles be described as the product of singleparticle wave functions. Maudlin writes the spin state of the pair of entangled particles as
Few philosophers of science include these mathematical details of quantum mechanics as does Maudlin. We can compare his quantum mechanics math to that of David Bohm, who in 1957 first formulated the quantum mechanics of entangled electrons, We consider a molecule of total spin zero consisting of two atoms, each of spin onehalf. The wave function of the system is therefore Note that when Bohm says "because the total spin is still zero, it can immediately be concluded that the same component of the spin of the other particle (B) is opposite to that of A," he is implicitly using the conservation of total spin.
In 1964, John Bell followed David Bohm. Here is Bell's description. As with Bohm, Bell does not explicitly mention conservation of angular momentum, but he describes spin components measured in the same direction...
With the example advocated by Bohm and Aharonov, the EPR argument is the following. Consider a pair of spin onehalf particles formed somehow in the singlet spin state and moving freely in opposite directions. Measurements can be made, say by SternGerlach magnets, on selected components of the spins σ_{1} and σ_{2}. If measurement of the component σ_{1} • a, where a is some unit vector, yields the value + 1 then, according to quantum mechanics, measurement of σ_{2} • a must yield the value — 1 and vice versa. In his most recent description of twoparticles that may be entangled, Maudlin first describes the two particles in separate singleparticle quantum states... We now have all the pieces in place to apply the recipe to Bohm’s version of the EPR experiment and to derive predictions of violations of Bell’s inequality...As usual, we construct the entangled state by starting with unentangled product states. Suppose we have a pair of electrons that begin in the same location, with one traveling off to the right the other to the left. The one going to the right can have the spinor z↑> and the one traveling to the left z↓>. The resulting product state could be symbolized as  z↑, right> and z ↓, left>...There is no entanglement in either of these states, and making predictions from them is easy. For example, in the first state, if both particles are passed through zoriented magnets, the rightmoving particle will be deflected up and the leftmoving one down. If they are both passed through xoriented magnets, then each has a 5050 chance of being deflected either way, with no correlations predicted between them. That is, finding out which direction one goes will not change the prediction about the other. It will still be 5050. Now Maudlin goes on to describe the entangled twoparticle quantum system, which Erwin Schrödinger describes as a superposition of the above two states.. By the superposition principle, we can form from this pair of states the entangled state  z↑, right> z ↓, left>   z ↓, right>  z ↑, left>... This is called the singlet state of spin... Like Bohm and Bell, Maudlin also does not mention the law of conservation of angular momentum (spin), but what if the two entangled particles remain at all times before a measurement in that singlet state with total spin zero? Can we still say, as Maudlin does, that there is still a 5050 chance that either particle will be measured up or down individually as required by quantum mechanical indeterminism, but that the twoparticle wave function has had a joint property that the total spin must remain zero at all times since the particles were originally entangled? So between the initial entanglement and the measurement, we cannot say one of the particles always has the same spin that will be found at measurement. It does not, as Einstein feared, follow "that each electron must be predisposed all along to be deflected the way it is." But can we say that the two spins, however indeterministic (5050) they may be individually, at all times between the initial entanglement and measurement, must be exactly opposite to one another. Otherwise a law of conservation, a deeper principle than either quantum or classical mechanics themselves, would be violated. As Maudlin correctly described this situation above, "the zspins of the particles are certain to have opposite values even though neither particle has a determinate zspin." Apart from the theory that properties like angular and linear momentum and energy are perfectly conserved quantities, the experiments of entangled particles spin always find spins exactly opposite when measured at the same angle. Theory and experiment together agree that conservation of the sum of two spins keeps the total spin zero, one up and one down, whatever the indeterministic nature might be of individual spin measurements. As Maudlin also says above, "there is no chance that both will be up or both down."
