Superconducting Quantum Devices Laboratory - qutrit
https://sqd.equs.org/tags/qutrit
enQutrit under control
https://sqd.equs.org/news/qutrit-under-control
<div class="category">Tagged with <span class="item odd"><a href="/tags/qutrit" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">qutrit</a></span> <span class="item even"><a href="/tags/quantum-tomography" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">quantum tomography</a></span></div><div class="body"><div class="item odd" property="content:encoded"><p>Many thing can be done with qubits nowdays. But about a qutrit? Our lab developed an interesting toolbox to do many things with qutrits. We can create quantum states with fidelities above 99%, perform quantum tomography of these states and even quantum process tomography for the measurement. More importantly we deduced a scheme to probe just one of the states of the qutrit while preserving quantum coherence between two other states. This type of the measurement is not trivial to realize and is necessary to test Kochen-Specker contextuality. See our recent <a href="/publications/realization-binary-outcome">paper</a> for details.</p></div></div><cite class="source" property="schema:citation">Source: <em><a href="http://sqd.equs.org/publications/realization-binary-outcome" rel="external nofollow">Realization of a binary-outcome projection measurement of a three-level superconducting quan</a></em></cite><span rel="schema:url" resource="/news/qutrit-under-control" class="rdf-meta element-hidden"></span><span property="schema:name" content="Qutrit under control" class="rdf-meta element-hidden"></span>Thu, 26 Nov 2015 07:47:59 +0000Arkady Fedorov132 at https://sqd.equs.orgRealization of a binary-outcome projection measurement of a three-level superconducting quantum system
https://sqd.equs.org/publications/realization-binary-outcome
<div class="authors"><div class="item odd">M. Jerger, P. Macha, A.R. Hamann, Y. Reshitnyk, K. Juliusson and A. Fedorov</div></div><div class="body"><div class="item odd" property="schema:description content:encoded"><p>The ability to determine whether a multi-level quantum system is in a certain state while preserving quantum coherence between all orthorgonal states is necessary to realize binary-outcome compatible measurements which are, in turn, a prerequisite for testing the contextuality of quantum mechanics. In this paper, we use a three-level superconducting system (a qutrit) coupled to a microwave cavity to explore different regimes of quantum measurement. In particular, we engineer the dispersive shifts of the cavity frequency to be identical for the first and second excited states of the qutrit which allows us to realize a strong projective binary-outcome measurement onto its ground state with a fidelity of 94.3%. Complemented with standard microwave control and low-noise parametric amplification, this scheme can be used to create sets of compatible measurements to reveal the contextual nature of superconducting circuits. </p></div></div><span rel="schema:url" resource="/publications/realization-binary-outcome" class="rdf-meta element-hidden"></span><span property="schema:name" content="Realization of a binary-outcome projection measurement of a three-level superconducting quantum system" class="rdf-meta element-hidden"></span>Wed, 25 Nov 2015 05:36:01 +0000Arkady Fedorov130 at https://sqd.equs.org