Heterodimers of heterometallic rings

Abstract

Nine new complexes are reported involving linked heterometallic rings; one ring is designed as a ligand for the second, and the 10 compounds produced can be regarded as molecular prototypes for implementing quantum gates featuring two subtly different qubits.We have been exploring the idea that heterometallic rings can be used as qubits for quantum computing, 1 complexes 4-6, the divalent site is bound to a pyridine from iso-nicotinate. The structure of 7 is shown in Figure 1; the large molecules pack inefficiently in the lattice and there are large voids in the structure which we assume are filled with solvent however these are so disordered they could not be 65 located. The family of linked cages creates the opportunity to study the exchange interaction in these iso-structural complexes. The {Cr 7 Ni} compounds 1 and 4 are the compounds regarded as possible qubits for quantum information processing as they 75 have S = 1/2 spin ground states. Therefore here we report studies of compound 7; and show by a variety of methods that there is a weak but measurable interaction between the two rings in this molecular ensemble. As the structures of 1 and 4 are essentially replicated in 7 the only new parameters 80 involved in fitting data involve the exchange interactions between the rings. Magnetic susceptibility data of 7 between 2 K and 300 K practically coincide with the sum of the susceptibilities of the two component rings ( Figure S1). However, very low-85

Constructing clock-transition-based two-qubit gates from dimers of molecular nanomagnets

“…Similarly, clock-transition behavior has been observed in the heterometallic ring Cr 7 Mn, discussed below [13]. Such rings can be coupled to each other to form supramolecular dimers, and possibly longer chains, that can be used to build multiqubit systems with coherence times comparable to those of the constituent monomers [18][19][20][21][22][23][24].…”

“…When coupled together, a pair of molecules with different parameters form a supramolecular heterodimer [20]. Interac-tions between the spins in the dimer can be modeled as a bilinear exchange interaction:…”

Controlled coherent dynamics of [VO(TPP)], a prototype molecular nuclear qudit with an electronic ancilla

“…1,2 Great efforts have been devoted to improve the coherence times of these systems, by following tailored synthetic strategies, [3][4][5][6][7][8][9][10][11][12][13] and to link complexes together in order to t specic requirements of quantum computation schemes. [14][15][16][17][18][19][20][21][22] However, the peculiar feature which makes MNMs different and potentially preferable over any other established quantumcomputing platform is represented by their intrinsic multilevel structure. 23,24 Indeed, the presence of many low-energy levels, with long coherence and easily accessible through microwave or radio-frequency pulses opens a range of new possibilities.…”

Constructing Clock-Transition-Based Two-Qubit Gates from Dimers of Molecular Nanomagnets

“…Similarly, clock-transition behavior has been observed in the heterometallic ring Cr 7 Mn (S = 1), discussed be-low [12]. Such rings can be coupled to each other to form supramolecular dimers, and possibly longer chains, that can be used to build multiqubit systems [16][17][18][19][20][21].…”

“…When coupled together, a pair of molecules with different parameters form a supramolecular heterodimer [18]. Interactions between the spins in the dimer can be modeled as a bilinear exchange interaction:…”