Molecular Dipolar Crystals as High Fidelity Quantum Memory for Hybrid Quantum Computing

Abstract

We study collective excitations of rotational and spin states of an ensemble of polar molecules, which are prepared in a dipolar crystalline phase, as a candidate for a high fidelity quantum memory. While dipolar crystals are formed in the high density limit of cold clouds of polar molecules under 1D and 2D trapping conditions, the crystalline structure protects the molecular qubits from detrimental effects of short range collisions. We calculate the lifetime of the quantum memory by identifying the dominant decoherence mechanisms, and estimate their effects on gate operations, when a molecular ensemble qubit is transferred to a superconducting strip line cavity (circuit QED). In the case rotational excitations coupled by dipole-dipole interactions we identify phonons as the main limitation of the life time of qubits. We study specific setups and conditions, where the coupling to the phonon modes is minimized. Detailed results are presented for a 1D dipolar chain.

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Cited by in corpus (8)

• Cold Atoms and Molecules in Self-Assembled Dipolar Lattices
• Holographic quantum computing
• Quantum computing with a single molecular ensemble and a Cooper pair box
• Collective excitations of trapped one-dimensional dipolar quantum gases
• Ground state of low dimensional dipolar gases: linear and zigzag chains
• Coupling nanomechanical cantilevers to dipolar molecules
• Structure and melting behavior of classical bilayer crystals of dipoles
• The low-energy excitation spectrum of one-dimensional dipolar quantum gases