The article discusses a new quantum computing protocol that uses long-range dipole-dipole interactions in systems like Rydberg atoms and polar molecules to implement a generalized controlled-not (CNOT) quantum gate. This multiqubit gate allows multiple control qubits to simultaneously control multiple target qubits, which can significantly speed up the implementation of various quantum algorithms, including Shor’s factoring algorithm.
The protocol generalizes a generic two-qubit Rydberg-blockade gate to multi-qubit gates involving many control and target qubits. This is achieved by using strong microwave fields to dress nearby Rydberg states, creating an asymmetric blockade where control-target interactions are much stronger than control-control and target-target interactions. The implementation of these multi-qubit gates can simplify both quantum algorithms and state preparation.
To demonstrate the effectiveness of the protocol, the authors show that a 25-atom GHZ state can be created using only three gates with an error of 7.8%. This new approach has the potential to significantly advance quantum computing technologies by enabling faster and more efficient implementation of complex quantum algorithms and state preparation.
Source: https://www.nist.gov/patents/qubit-gate-and-producing-generalized-controlled-not-quantum-gate
Keywords: Rydberg, qubits, entangling, gates, algorithms
