Welcome!
QuCoCo Workshop feedback
QuCoCo Workshop feedback (Oxford, 9th - 10th November 2009)
QuCoCo workshop recently took place in Oxford with the support of the QIP IRC. The workshop was aimed at early stage researchers and was attended by a mixture of post-docs and doctoral students, who presented results on the topic of "Quantum Correlations and Computations". Whilst the QIP IRC is nearing the end of its term, many participants at the workshop were keen to find a way to support future workshops in the same spirit to cement the collaborative networks established by the QIP IRC.
A full booklet of abstracts can be requested by emailing qucocoworkshop@gmail.com. Here I will summarize a selection of the results presented:
A full booklet of abstracts can be requested by emailing qucocoworkshop@gmail.com. Here I will summarize a selection of the results presented:
Category: General
Posted by: webmaster
Many prototype quantum computers which are being developed rely on photons to rapidly produce entanglement. However, the principle drawback of using photons is that they are easily lost, and hence only produce entanglement probabilistically.
In recent years the so-called graph state, or cluster state, approach to quantum computing has emerged as the leading candidate for achieving quantum computation despite probabilistic entangling operations.
Yuichiro Matsuzaki presented work showing that computations could be performed quicker, and with less memory, by growing quantum states where the entanglement can be visualized as having a snow-flake like structure.
Indeed, the efficiency of this snow-flake approach proves so effective that it is robust against noise accumulation problems that cast doubt on whether earlier strategies would be capable of large scale quantum computation.
Condensed matter systems form another important area of study as a viable medium for quantum computation. However, even before computational applications were known of, certain 1-dimensional chains of spins were known to exhibit entanglement. For instance, in certain systems an impurity spins can form an entangled singlet state with a cloud of electrons, known as the kondo cloud. However, the distance over which the entanglement decays has not been fully understood.
Abolfazl Bayat presented results at QuCoCo which showed that the scaling of the entanglement is found to be independent of the system size. Furthermore, Bayat showed that by judicious use of quenching impurity spins, this mechanism can be exploited to generate long distance entanglement between two impurity spins.
It is well known that microscopic systems obeying quantum mechanics can give rise to non-local correlations. Though the severity of these non-local correlations is limited, the formal axioms of quantum mechanics do not lend themselves to an intuitive explanation of these limitations.
At QuCoCo workshop, Miguel Navascues presented a simple principle that the macroscopic world is always local. A physical principle supported simply by looking out the window at the everyday world. Navascues showed that alone macroscopic locality entails stringent restrictions on the degree of microscopic non-locality, which surprisingly predict many of the limitations on quantum correlations.
Earl Campbell
In recent years the so-called graph state, or cluster state, approach to quantum computing has emerged as the leading candidate for achieving quantum computation despite probabilistic entangling operations.
Yuichiro Matsuzaki presented work showing that computations could be performed quicker, and with less memory, by growing quantum states where the entanglement can be visualized as having a snow-flake like structure.
Indeed, the efficiency of this snow-flake approach proves so effective that it is robust against noise accumulation problems that cast doubt on whether earlier strategies would be capable of large scale quantum computation.
*********************
Condensed matter systems form another important area of study as a viable medium for quantum computation. However, even before computational applications were known of, certain 1-dimensional chains of spins were known to exhibit entanglement. For instance, in certain systems an impurity spins can form an entangled singlet state with a cloud of electrons, known as the kondo cloud. However, the distance over which the entanglement decays has not been fully understood.
Abolfazl Bayat presented results at QuCoCo which showed that the scaling of the entanglement is found to be independent of the system size. Furthermore, Bayat showed that by judicious use of quenching impurity spins, this mechanism can be exploited to generate long distance entanglement between two impurity spins.
*********************
It is well known that microscopic systems obeying quantum mechanics can give rise to non-local correlations. Though the severity of these non-local correlations is limited, the formal axioms of quantum mechanics do not lend themselves to an intuitive explanation of these limitations.
At QuCoCo workshop, Miguel Navascues presented a simple principle that the macroscopic world is always local. A physical principle supported simply by looking out the window at the everyday world. Navascues showed that alone macroscopic locality entails stringent restrictions on the degree of microscopic non-locality, which surprisingly predict many of the limitations on quantum correlations.
*********************
Earl Campbell
Next page: News