TY - JOUR
AB - As information carriers in quantum computing, photonic qubits
have the advantage of undergoing negligible decoherence. However,
the absence of any significant photonâ€“photon interaction is
problematic for the realization of non-trivial two-qubit gates. One
solution is to introduce an effective nonlinearity by measurements
resulting in probabilistic gate operations. In one-way quantum
computation, the random quantum measurement error can be
overcome by applying a feed-forward technique, such that the
future measurement basis depends on earlier measurement results.
This technique is crucial for achieving deterministic quantum
computation once a cluster state (the highly entangledmultiparticle
state on which one-way quantum computation is based) is prepared.
Here we realize a concatenated scheme of measurement and
active feed-forward in a one-way quantum computing experiment.
We demonstrate that, for a perfect cluster state and no photon loss,
our quantum computation scheme would operate with good fidelity
and that our feed-forward components function with very high
speed and low error for detected photons. With present technology,
the individual computational step (in our case the individual
feed-forward cycle) can be operated in less than 150 ns using electrooptical
modulators. This is an important result for the future
development of one-way quantum computers, whose large-scale
implementation will depend on advances in the production and
detection of the required highly entangled cluster states.
AU - Prevedel, R.
AU - Walther, P.
AU - Tiefenbacher, F.
AU - BĂ¶hi, P.
AU - Kaltenbaek, R.
AU - Jennewein, T.
AU - Zeilinger, A.
DA - 2007/01/01/
PY - 2007
SE - 2007/01/01/
TI - High-speed linear optics quantum computing using active feed-forward
UR - http://www.nature.com/nature/journal/v445/n7123/pdf/nature05346.pdf
ER -