Asymmetric blockade and multi-qubit gates via dipole-dipole interactions

Abstract

Due to their strong and tunable interactions, Rydberg atoms can be used to realize fast two-qubit entangling gates. We propose a generalization of a generic two-qubit Rydberg-blockade gate to multi-qubit Rydberg-blockade gates which involve both many control qubits and many target qubits simultaneously. This is achieved by using strong microwave fields to dress nearby Rydberg states, leading to asymmetric blockade in which control-target interactions are much stronger than control-control and target-target interactions. The implementation of these multi-qubit gates can drastically simplify both quantum algorithms and state preparation. To illustrate this, we show that a 25-atom GHZ state can be created using only three gates with an error of 7.8%.

5+4 pages, 3+2 figures

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• Enhancement of Rydberg Blockade via Microwave Dressing
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• Quantum Zeno approach for molecular energies with maximum commuting initialHamiltonians
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• Implementing a Fast Unbounded Quantum Fanout Gate Using Power-Law Interactions
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• Generalized Parity Measurements and Efficient Large Multi-component Cat State Preparation with Quantum Signal Processing
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