



01443nas a2200217   4500008004100000245007500041210006900116260001400185300000900199490000600208520080900214100002001023700002301043700002501066700002001091700001701111700001901128700001801147700002301165856003701188       2013                        eng d00aTopologically Protected Quantum State Transfer in a Chiral Spin Liquid0 aTopologically Protected Quantum State Transfer in a Chiral Spin   c2013/3/12  a15850 v43 a  Topology plays a central role in ensuring the robustness of a wide variety of
physical phenomena. Notable examples range from the robust current carrying
edge states associated with the quantum Hall and the quantum spin Hall effects
to proposals involving topologically protected quantum memory and quantum logic
operations. Here, we propose and analyze a topologically protected channel for
the transfer of quantum states between remote quantum nodes. In our approach,
state transfer is mediated by the edge mode of a chiral spin liquid. We
demonstrate that the proposed method is intrinsically robust to realistic
imperfections associated with disorder and decoherence. Possible experimental
implementations and applications to the detection and characterization of spin
liquid phases are discussed.
1 aYao, Norman, Y.1 aLaumann, Chris, R.1 aGorshkov, Alexey, V.1 aWeimer, Hendrik1 aJiang, Liang1 aCirac, Ignacio1 aZoller, Peter1 aLukin, Mikhail, D.  uhttp://arxiv.org/abs/1110.3788v101927nas a2200205   4500008004100000245009400041210006900135260001400204300000800218490000600226520130900232100002001541700001701561700002501578700002201603700001701625700001901642700002301661856003701684       2012                        eng d00aScalable Architecture for a Room Temperature Solid-State Quantum  Information Processor
0 aScalable Architecture for a Room Temperature SolidState Quantum   c2012/4/24  a8000 v33 a  The realization of a scalable quantum information processor has emerged over
the past decade as one of the central challenges at the interface of
fundamental science and engineering. Much progress has been made towards this
goal. Indeed, quantum operations have been demonstrated on several trapped ion
qubits, and other solid-state systems are approaching similar levels of
control. Extending these techniques to achieve fault-tolerant operations in
larger systems with more qubits remains an extremely challenging goal, in part,
due to the substantial technical complexity of current implementations. Here,
we propose and analyze an architecture for a scalable, solid-state quantum
information processor capable of operating at or near room temperature. The
architecture is applicable to realistic conditions, which include disorder and
relevant decoherence mechanisms, and includes a hierarchy of control at
successive length scales. Our approach is based upon recent experimental
advances involving Nitrogen-Vacancy color centers in diamond and will provide
fundamental insights into the physics of non-equilibrium many-body quantum
systems. Additionally, the proposed architecture may greatly alleviate the
stringent constraints, currently limiting the realization of scalable quantum
processors.
1 aYao, Norman, Y.1 aJiang, Liang1 aGorshkov, Alexey, V.1 aMaurer, Peter, C.1 aGiedke, Geza1 aCirac, Ignacio1 aLukin, Mikhail, D.  uhttp://arxiv.org/abs/1012.2864v1