Quantum Computation possible with Majorana Fermions
Δημοσιεύτηκε στις 19 Απρ 2013
Using
indium antimonide nanowires it may be possible to create a pair of
Majorana fermions that form the basis of the topological qubit.
'Standard'
qubits have been implemented in diverse physical systems. Now,
so-called topological qubits could potentially be used for
decoherence-free quantum computing.
Majorana Fermions are
quasiparticles, theoretically predicted to form as excitations in
superconductors. Majorana Fermions are their own antiparticles, this
becomes possible because the superconductor imposes electron hole
symmetry on the quasiparticle excitations. This creates a symmetry which
is similar to the concept of the Dirac Fermion except that the quantum
states for creation and annihilation are identical under the same order
exchange operations.
Majorana fermion bound states at zero energy
are therefore an example of non-abelian anyons: interchanging them
changes the state of the system in a way which depends only on the order
in which exchange was performed.
The non-abelian statistics that
Majorana bound states possess allows to use them as a building block for
a topological quantum computer.
The team from the Kavli
Institute of Nanoscience at Delft University of Technology in the
Netherlands reported an experiment involving indium antimonide nanowires
connected to a circuit with a gold contact at one end and a slice of
superconductor at the other. When exposed to a moderately strong
magnetic field the apparatus showed a peak electrical conductance at
zero voltage that is consistent with the formation of a pair of Majorana
bound states, one at either end of the region of the nanowire in
contact with the superconductor.
indium antimonide nanowires it may be possible to create a pair of
Majorana fermions that form the basis of the topological qubit.
'Standard'
qubits have been implemented in diverse physical systems. Now,
so-called topological qubits could potentially be used for
decoherence-free quantum computing.
Majorana Fermions are
quasiparticles, theoretically predicted to form as excitations in
superconductors. Majorana Fermions are their own antiparticles, this
becomes possible because the superconductor imposes electron hole
symmetry on the quasiparticle excitations. This creates a symmetry which
is similar to the concept of the Dirac Fermion except that the quantum
states for creation and annihilation are identical under the same order
exchange operations.
Majorana fermion bound states at zero energy
are therefore an example of non-abelian anyons: interchanging them
changes the state of the system in a way which depends only on the order
in which exchange was performed.
The non-abelian statistics that
Majorana bound states possess allows to use them as a building block for
a topological quantum computer.
The team from the Kavli
Institute of Nanoscience at Delft University of Technology in the
Netherlands reported an experiment involving indium antimonide nanowires
connected to a circuit with a gold contact at one end and a slice of
superconductor at the other. When exposed to a moderately strong
magnetic field the apparatus showed a peak electrical conductance at
zero voltage that is consistent with the formation of a pair of Majorana
bound states, one at either end of the region of the nanowire in
contact with the superconductor.
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- Τυπική άδεια YouTube
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 19/11/2015
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