Patent ID: 7250624

Claim:
A logical gate for a quantum computer, the logical gate comprising: first and second electrically-conductive gates for adjusting a first electrical potential confining a fractional quantum Hall effect (FQHE) fluid, the first and second gates forming a first pair of electrically-conductive gates; third and fourth electrically-conductive gates for adjusting a second electrical potential confining the FQHE fluid, the third and fourth gates forming a second pair of electrically-conductive gates; fifth and sixth electrically-conductive gates for adjusting a third electrical potential confining the FQHE fluid, the fifth and sixth gates forming a third pair of electrically-conductive gates; a first anti-dot defined by an absence of FQHE fluid between the first pair of gates and the second pair of gates; a second anti-dot defined by an absence of FQHE fluid between the second pair of gates and the third pair of gates; a third anti-dot defined by an absence of FQHE fluid between the third and fourth gates; a voltage source electrically coupled to each of the third and fourth gates for applying a respective electrical potential to each of the third and fourth gates to control a gap between the third and fourth gates, wherein the voltage source is adjustable to affect a collective quantum state of the anti-dots by causing a quasi-particle to tunnel from the third gate to the fourth gate; means for removing an output current drained from an edge of the FQHE fluid; and means for determining from the output current the collective quantum state of the anti-dots.