Entanglement of group-II-like atoms with fast measurement for quantum information processing

Abstract

We construct a scheme for the preparation, pairwise entanglement via exchange interaction, manipulation, and measurement of individual group-II-like neutral atoms (Yb, Sr, etc.). Group-II-like atoms proffer important advantages over alkali metals, including long-lived optical-transition qubits that enable fast manipulation and measurement. Our scheme provides a promising approach for producing weighted graph states, entangled resources for quantum communication, and possible application to fundamental tests of Bell inequalities that close both detection and locality loopholes.

Improved error-scaling for adiabatic quantum evolutions

“…The phase difference is then transferred to the respective components of the two-qubit subspace {|i j : i, j ∈ {0, 1}}. This produces an operation that (with single-qubit rotations) is locally equivalent to a tunable entangling controlled-phase gate e −2iα|11 11| [23].…”

“…Following previous work [5,23], we examine a simple Hamiltonian governing two identical particles confined to one dimension and trapped by pair of moving potential wells. The Hamiltonian for particles 1 and 2 is given by…”

Spin-dependent collision of ultracold metastable atoms

“…For example, the use of long-lived metastable P states (as well as the ground S state) has been explored as a useful quantum computing platform [1][2][3][4][5]. Also, the ultranarrow 1 S 0 -3 P 0 atomic resonance in a "magic wavelength" optical lattice may be highly competitive as a new optical frequency standard [6].…”

“…Also, the ultranarrow 1 S 0 -3 P 0 atomic resonance in a "magic wavelength" optical lattice may be highly competitive as a new optical frequency standard [6]. In addition, in the area of quantum simulation, there are several theoretical studies of the use of 3 P J (J = 0,2) atoms for studies of Hamiltonians with both spin and orbital degrees of freedom [7,8], implementation of Abelian artificial gauge potentials [9], or simulation of Kondo lattice model [10]. Furthermore, an ytterbium atom, which is a rare-earth-metal atom with an alkaline-earth-metallike electronic structure, has attracted great interest from the viewpoint of fundamental physics since it exhibits a giant parity violation effect [11].…”

Reservoir spectroscopy of5s5p3P2–5snStellmer1, Schreck2 2014Phys. Rev. A317441View full textAdd to dashboardCite

“…Quantum degenerate samples of Yb [7][8][9][10][11] and the alkaline-earth-metals Ca [12,13] and Sr [14][15][16][17][18][19][20] have opened new possibilities, such as the study of SU(N ) magnetism [21][22][23][24][25][26][27][28][29][30][31][32][33][34], novel schemes to simulate gauge fields [35][36][37][38][39][40], the engineering of interactions beyond contact interactions [41][42][43][44], the creation of driven-dissipative many-body states [45], the simulation of an extra dimension [46], and new ways to perform quantum computation [47][48][49][50][51].…”