visual amusements^*
 

Fig 1 - A quantum register composed of three qubits can store in a given moment of time all
          eight numbers in a quantum superposition ¹

Fig 2 - Milestones in the development of quantum computer technology (March 1998)  ²
 

Type of Hardware	Number of qubits needed	Number of steps before decoherence	Status
Quantum Cryptography	1	1	Implemented
Entanglement-based quantum cryptography	2	1	Demonstrated in lab
Quantum-controlled NOT-gate	2	1	Demonstrated in lab
Composition of quantum gates	2	2	Demonstrated in lab
Deutsch's algorithm	2	3	Demonstrated in NMR quantum computer
Channel capacity doubling	2	2	Imminent
Teleportation	3	2	Achieved
Entanglement swapping	4	1	Achieved intermittently
Repeating station for quantum cryptography	A few	A few	Theory not yet complete
Quantum simulations	A few	A few	Simple cases demonstrated
Grover's algorithms with toy data	3+	6+	Forseeable
Ultra-precise frequency standards	A few	A few	Foreseeable
Entanglement purification	A few	A few
Shor's algorithms with toy data	16+	Hundreds+
Quantum factoring engine	Hundreds	Hundreds
Universal quantum computer	Thousands	Thousands+

Fig 3 - Relationships between information science (including computer science) and quantum mechanics ⁶

Fig 4 - University of Innsbruck experimental setup for quantum teleportation ⁴
 

*superscripted number following figure descriptions corresponds to that of source in works cited page
 

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