Einstein’s general relativity and the theory of quantum mechanics are fundamentally incompatible, which has prompted over 30 years of work in string theory and quantum gravity. Not only Einstein’s theory does not work on the quantum scale; it does not work on the scale of galactic clusters either.
Gravity is neither a fundamental force, nor a spacetime curvature. There are no physical, empirically detectable graviton particles, for the same reason that there are no magneton particles of the magnetic field. Magnetons and gravitons are at best virtual particles only. In order to propagate, quantum gravity and quantum antigravity need to rely on magnetic fields.
As we shall see below, quantum gravity and quantum antigravity are essentially not so much different from electromagnetism. This would explain the reason why there has not been a successful unification of Einsten’s general realativity and electromagnetism. Well, it is simply impossible to unify electromagnetism, or quantum mechanics, with gravity, when gravity is not properly understood.
In general, for quantum gravity, or quantum antigravity, to be generated naturally, or artificially, we need the following 3 components properly combined, oriented, and tuned:

magnetic field ;

angular momentum (spin) ;

electric field.
Ideally, the electric and magnetic field lines should be perpendicular. Also ideally, the vector of angular momentum should be in a plane perpendicular to the lines of the electric field. Deviations from the 90′ angle will weaken the effect.
Let’s illustrate it with a simple example.
As the example, we will consider the anomalous behavior of a gyroscope. What keeps the spinning gyroscope from falling under the force of gravity while it is rotating (precessing) horizontally? Could this really be antigravity? Let’s see.
The spinning gyroscope provides the first component — angular momentum. This vector of angular momentum should be perpendicular to the lines of the electric field. Earth happens to be an asymmetric (spherical) capacitor, as required by the BiefeldBrown effect.
Except in magnetic pole regions, Earth’s magnetic field lines are generally perpendicular to Earth’s electric field lines.
Let’s summarize the above example.
We have the 3 above components: the angular momentum of the spinning gyroscope, Earth’s electric and magnetic fields. Earth’s electric and magnetic fields are generally perpendicular, and the angular momentum of the spinning gyroscope rotating (precessing) horizontally is generally always in the plane perpendicular to the lines of Earth’s electric field. Therefore, what keeps the spinning gyroscope from falling under the force of gravity while it is rotating (precessing) horizontally is antigravity, which perfectly explains the following serious experimental anomalies:
But, shouldn’t antigravity be also acting on the gyroscope when it spins vertically? When the gyroscope spins vertically, the angle between its vector of angular momentum and the lines of the electric field is zero degrees, therefore the strength of interaction between them is zero. The function for this interaction is a modulus sinusoid, sin. At zero degrees the value is zero, at 90′ the value is maximum, and at 180′ the value is zero, again.
In the section on the BiefeldBrown page, we have a similar example of an antigravity effect with a capacitor.
In the above case, the gyroscope (from its own side) provides only its angular momentum, while perpendicular electric and magnetic fields are provided by Earth.
In the case of the capacitor, it provides its own electric field (with inhomogeneous charge density distribution in the dielectric) that is aligned with Earth’s electric field. Magnetic field is provided by Earth. But where is the third component, the angular momentum?
In the case of the capacitor, it is the combined angular momentum of those dielectric’s elementary particles that happen to have their angular momentum oriented perpendicular to the internal lines of capacitor’s electric field, which explains the reason why the BiefeldBrown effect is very weak, despite that it requires extremely high voltage. It is weak, because the third component, the angular momentum, is very weak. Comparatively, the angular momentum of the gyroscope is very powerful. That is why gyroscope exhibits a far more spectacular antigravity efect than the capacitor.
So far, so good. But these were just two simple examples. Now, let’s see if we can explain everything else.
We have examined antigravity effects related to gyroscope and capacitor. It is relatively easy to experiment with both of them. Now, let’s consider another case.
The Earth is a complete macroscale example of an antigravity device. It is an asymmetric capacitor with positively charged plate being larger; its electric and magnetic field lines are perpendicular (except in magnetic pole regions); and its angular momentum is perfectly perpendicular to the electric field lines around the equator, declining from the 90′ angle to zero degrees angle towards magnetic poles. The BiefeldBrown vector is “up”. This way we have the complete 3 antigravity generation components combined, oriented, and tuned.
Earth as a complete example of an antigravity device?! Here comes the “quantum” part of gravity and antigravity.
Isn’t it obvious that Earth is a “gravity device” only? Yes, Earth is a gravity device, and it is also an antigravity device at the same time. How is it possible?
Above, I explained how Earth is a complete example of a macroscale antigravity device. Now, let’s find out how Earth at the same time can also be a quantumscale gravity device.
Earth is composed of atoms. Atom can be conceptualized as a spherical asymmetric electric capacitor, but this time with negatively charged plate being larger.
The direction of BiefeldBrown vectors is always from negative to positive plate. In the case of an atom, its negative plate is larger, so the BB vector is said to be “down” (towards nucleus), indicating attractive gravity.
All atoms composing Earth have their BB vectors “down”, and atoms composing material bodies on Earth also have their BB vectors “down”, therefore Earth will attract these material bodies, and material bodies will attract Earth — an attractive gravitational interaction.
On the quantumscale, Earth and material bodies on Earth are composed of many “capacitors” (atoms) that have their BiefeldBrown vectors “down”, while on the macroscale, Earth is just one big planetsize capacitor that has its BiefeldBrown vectors “up”, meaning directed away from its “nucleus”, i.e. from the ground up towards ionosphere. In this way, from the quantumscale perspective, Earth is an attractive gravity device, and at the same time, from the macroscale perspective, Earth is an antigravity device.
The reason that almost all material bodies on Earth do not experience any detectable antigravity effects should be clear now. Just consider the difference between the two above examples of spinning gyroscope and charged capacitor, and all other material bodies. Most of the material bodies on Earth are neither highly electrically charged, nor do they possess any sufficient angular momentum in order to experience any detectable antigravity effects inside Earth’s macroscale perpendicular electric and magnetic fields, except for bicycle wheels and airplane propellers, or even clouds.
In order to illustrate this new idea that from the quantumscale perspective, Earth is an attractive gravity “device,” and at the same time, from the macroscale perspective, Earth is a repulsive gravity “device,” let’s view the following short video:
In the above video, the magnetic device composed of one big central magnet, and six smaller “flipped” (or “inverted”) magnets is clearly capable of magnetic attraction and repulsion at the same time. Just because the large magnet attracts, and small magnets repel, it does not follow that these two opposing effects cancel each other out, and that is the reason for the unexpected and particularly important “sideeffect”: STABILITY.
Let’s imagine what could happen between the Sun and the Earth, when Sun is gravitationally attracting Earth, but Earth is both gravitationaly attracting and repelling the Sun at the same time. Would it be possible that Earth could have a stable orbit around the Sun as a result of this unexpected “sideeffect” ?
This could, in principle, explain the stability of the entire Solar system, including all the moons of all the planets.