Analysis of experimental feasibility of polar-molecule-based phase gates

Toward scalable information processing with ultracold polar molecules in an electric field: A numerical investigation

“…As opposed to before, these levels have a large dipole moment and the strong dipole-dipole interaction coupling adjacent molecules allow logic gate operations implemented on several molecules. One should emphasize that this procedure differs from the realization of logic gates based on switchable dipoledipole interactions proposed by Kuznetsova et al [35] because, in our case, the variation of the dipole-dipole interaction is not part of the logical operation itself. For molecules separated by a distance R of 300 nm, the dipole-dipole interaction is of the order of a few tens of kilohertz.…”

“…Information can be stored in these long-lived levels for they have no permanent dipole moment and the molecules can therefore be regarded as isolated from one to another even in the presence of the electric field. When a logical operation needs to be carried out, the required molecules (depending on the number of qubits for the computation) are brought to the lowest vibrational levels [35]. As opposed to before, these levels have a large dipole moment and the strong dipole-dipole interaction coupling adjacent molecules allow logic gate operations implemented on several molecules.…”

“…Different schemes have been proposed to realize universal quantum gates and manipulate qubits encoded on molecular levels. The realization of a conditional phase gate has been proposed by using either a switchable dipole-dipole interaction [34,35] or a sequence of laser pulses [36].…”

Electronic structure of ultralong-range Rydberg penta-atomic molecules with two polar diatomic molecules

“…The Rydbergelectron-induced coupling gives rise to a strong hybridization of the rotational states and a strong orientation and alignment of the diatomic molecule. Since in the giant Rydberg molecule, the orientation of the diatomic molecule changes sign as the distance from the Rydberg core varies [23,26], two internal rotational states of opposite orientation could be Raman coupled [23] to create a switchable dipole-dipole interaction needed to implement molecular qubits [32]. A non-destructive scheme to readout the internal state of polar molecules has been proposed based on the Rydberg-field-induced interaction with the molecular electric dipole moment [33,34].…”

Simulation of the elementary evolution operator with the motional states of an ion in an anharmonic trap

“…As predicted by Feynman, 3 quantum computers could be used as quantum simulators to solve stationary [4][5][6][7][8][9] or non stationary 10-13 quantum problems by simulating them with a controllable experimental setup which allows one to reproduce the dynamics of a given Hamiltonian. Several physical supports have been proposed to encode qubits: 14 photons, 15 spin states using nuclear magnetic resonance (NMR) technology, 16 quantum dots, 17 atoms, 18 molecular rovibrational levels of polyatomic or diatomic molecules, ultracold polar molecules, [48][49][50][51][52][53][54][55][56][57] or a juxtaposition of different types of systems. 58 In the current work, we focus on trapped ions [59][60][61][62][63][64] which remain one of the most attractive candidates due to the long coherence time scales and the possibility of exploiting the strong Coulomb interaction.…”