The Info List - Quantum Experience

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QUANTUM EXPERIENCE (QX) enables anyone to easily connect to IBM’s quantum processor via the IBM
Cloud, to run algorithms and experiments , and explore tutorials and simulations around what might be possible with quantum computing . It is an example of cloud based quantum computing . The QX also hosts an internet forum for users to interact.

IBM’s quantum processor is made up of superconducting transmon qubits , located in a dilution refrigerator at the IBM
Research headquarters at the Thomas J. Watson Research Center .

Users interact with the quantum processor through the quantum circuit model of computation, applying quantum gates on the qubits using a GUI called the quantum composer, writing quantum assembly language code or through a Python API .


* 1 History

* 2 Quantum Composer

* 2.1 Example script * 2.2 Beginner\'s Guide * 2.3 Full User Guide

* 3 Usage * 4 References * 5 External links


In May 2016, IBM
launched QX, with a five qubit quantum processor and matching simulator connected in a star shaped pattern, which users could only interact with through the quantum composer, with a limited set of two-qubit interactions, and a user guide that assumed background in linear algebra .

In July 2016, IBM
launched the QX community forum.

In January 2017, IBM
made a number of additions to the QX, including increasing the set of two-qubit interactions available on the five qubit quantum processor, expanding the simulator to custom topologies up to twenty qubits, and allowing users to interact with the device and simulator using quantum assembly language code.

In March 2017, IBM
released a Python API and SDK to enable users to more easily write code and run experiments on the quantum processor and simulator, as well as introduced a user guide for beginners.

In May 2017, IBM
made an additional 16 qubit processor available on QX through a beta program.


A screenshot showing a result from running a quantum score through IBM's Quantum simulation software.

The Quantum Composer is a graphic user interface ( GUI
) designed by IBM
to allow users to construct various quantum algorithms . Users may see the results of their quantum algorithms by either running it through a simulation or queuing in line and using "units" to use IBM's quantum computer. Algorithms developed in the Quantum Composer are referred to as a "quantum score", in reference to the Quantum Composer resembling a musical sheet.

IBM's Quantum Experience currently contains a library teaching users how to use the Quantum Composer. The library consists of three guides: Beginner's Guide, Full User Guide, and Developers Guide.

The composer is also possible to use in scripting mode, where the user can write programs in the QASM-language instead.


Below is an example in the QASM-language of a very small program, built for IBMs 5-qubit computer. The program instructs the computer to generate the state = 1 2 ( 000 + 111 ) {displaystyle Psi rangle ={frac {1}{sqrt {2}}}left(000rangle +111rangle right)} , which is a variant of the Bell state with three qubits instead of just the classical two. It then measures the state, forcing it to collapse to one of the two possible outcomes.

include "qelib1.inc" qreg q; // allocate 5 qubits (set automatically to 00000>) creg c; // allocate 5 classical bits h q; // hadamard-transform qubit 0 cx q, q; // conditional pauli X-transform (ie. "CNOT") of qubits 0 and 1. this generates the normal 2-qubit bell state cx q, q; // this expands entanglement to the 3rd qubit measure q -> c; // this measurement collapses the state measure q -> c; // qubit 1 and 2 read the same value as qubit 0 measure q -> c;

Every instruction in the QASM language is the application of a quantum gate , initialization of the chips registers to zero or measurement of these registers.


The Beginner's Guide introduces users to the terminology and conceptual knowledge of quantum mechanics needed to compose quantum scores. The beginners guide introduces readers to the elementary concepts of quantum computing: behavior of quibits , quantum entanglement , and quantum gates .


The full user guide is more in depth and analytical compared to the beginner's guide, and is recommended for those with experience in linear algebra or quantum computing. Unlike the beginners guide, the full user guide contains quantum algorithm examples, with explanations comparing quantum algorithms to their classical counterparts. Currently as of 4 July 2017, the full user guide is incomplete.


reports that there are over 40,000 users of the QX, who have collectively run over 275,000 experiments.

Many of these users are active researchers who have collectively published at least 15 academic papers using the platform.

University professors are also integrating examples and experiments based on the IBM
Quantum Experience into their educational curricula.

Dr. Christine Corbett Moran, a postdoctoral fellow at the California Institute of Technology , used the QX while she was doing research in Antarctica

People have also used the IBM
Quantum Experience for various non-academic purposes. One ingenious user has begun developing games using the Quantum Experience, including one titled "quantum battleships".


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Makes Quantum Computing Available on IBM
Cloud to Accelerate Innovation". * ^ " IBM
Quantum Experience Update". * ^ " Quantum computing
Quantum computing
gets an API and SDK". * ^ "Beta access our upgrade to the IBM
QX". * ^ " IBM
Q experience". Quantum Experience. IBM. Retrieved 3 July 2017. * ^ "Welcome to the IBM
Quantum Experience". Quantum Experience. IBM. Retrieved 4 July 2017. * ^ "Coming soon...". Retrieved 4 July 2017. * ^ " IBM
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* ^ Fedortchenko, Serguei (8 July 2016). "A quantum teleportation experiment for undergraduate students". arXiv :1607.02398   . * ^ Berta, Mario; Wehner, Stephanie; Wilde, Mark M (6 July 2016). "Entropic uncertainty and measurement reversibility". New Journal of Physics. 18 (7): 073004. doi :10.1088/1367-2630/18/7/073004 . * ^ Li, Rui; Alvarez-Rodriguez, Unai; Lamata, Lucas; Solano, Enrique (23 November 2016). "Approximate Quantum Adders with Genetic Algorithms: An IBM
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