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<div class="section" id="classical-communication">
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<h1>Classical Communication<a class="headerlink" href="#classical-communication" title="Permalink to this headline"></a></h1>
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<p>In the figure below there is a schematic overview of how the communication is realized between the nodes in a network simulated by SimulaQron.
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In this setup there are three nodes: Alice, Bob and Eve.
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Firstly, the applications in each node communicate with a CQC (classical-quantum-combiner) server that in turn talk to a SimulaQron server.
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CQC is an interface between the classical control information in the network and the hardware, here simulated by SimulaQron.
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The communication between the nodes needed to simulate the quantum hardware is handled by the SimulaQron servers, denoted SimulaQron internal communication in the figure.
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Note that such communication is needed since entanglement cannot be simulated locally.
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SimulaQron comes with a Python library that handles all the communication between the application and the CQC server.
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In this library, the object <code class="code docutils literal notranslate"><span class="pre">CQCConnection</span></code> takes care of this communication.
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Any operation applied to the qubits in this Python library is translated to a message sent to the CQC server, by the <code class="code docutils literal notranslate"><span class="pre">CQCConnection</span></code>.</p>
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<p>On top of the quantum network there will be classical communication between the applications, denoted Application communication in the figure.
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This communication include for example the case where Alice can sends Bob an encoded classical message or a measurement outcome.
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Such communication would also be present in a real implementation of a quantum network.
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There is a built-in feature in the Python library that realize this functionality, which have been developed for ease of use for someone not familiar with a client/server setup.</p>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">To have classical communication between the applications, one is not forced to use the built-in functionality realized by the <code class="docutils literal notranslate"><span class="pre">CQCConnection</span></code>. You can just as well setup your own client/server communication using the method of your preference. More information and a template for setting up a client/server interaction can be found in <a class="reference internal" href="NativeModeTemplate.html"><span class="doc">Template for programming in native mode</span></a>:.</p>
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<p>The built-in classical communication of the Python library is handled by the object <code class="code docutils literal notranslate"><span class="pre">CQCConnection</span></code>.
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Let assume that Alice wants to send a classical message to Bob and that Alice and Bob are instances of <code class="code docutils literal notranslate"><span class="pre">CQCConnection</span></code> at the respective nodes.
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This can be done by simply executing <code class="code docutils literal notranslate"><span class="pre">Alice.sendClassical(&quot;Bob&quot;,</span> <span class="pre">msg)</span></code>, where <code class="code docutils literal notranslate"><span class="pre">msg</span></code> is the message to be sent from Alice to Bob.
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The method <code class="code docutils literal notranslate"><span class="pre">sendClassical</span></code> tries to open a socket connection to Bob and to sent the message.
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Note that if this method is never called, a socket connection is never opened.
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The socket connection between Alice and Bob are closed after the message is sent.
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This classical communication is thus not built for efficiency but for easy of use for someone not familiar with client/server setup.</p>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">CQC and the python library does not require SimulaQron to function. However if you want to use the built-in classical communication you need SimulaQron installed.</p>
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<a class="reference internal image-reference" href="_images/servers.png"><img alt="Programming SimulaQrons Interfaces" class="align-center" src="_images/servers.png" style="width: 600px;" /></a>
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&#169; Copyright 2017, Stephanie Wehner and Axel Dahlberg.
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