Quantum Computing: Quantum Computing: An Overview An Overview for non-specialists for non-specialists Mikio Nakahara Mikio Nakahara Department of Physics & Department of Physics & Research Centre for Quantum Research Centre for Quantum Computing Computing Kinki University, Japan Kinki University, Japan Financial supports from Kinki Univ., MEXT and JSPS
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Quantum Computing: An Overview for non-specialists Mikio Nakahara Department of Physics & Research Centre for Quantum Computing Kinki University, Japan.
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Mikio NakaharaMikio NakaharaDepartment of Physics & Department of Physics & Research Centre for Quantum Research Centre for Quantum ComputingComputingKinki University, JapanKinki University, Japan
Quantum computation & information processing make use of quantum systems to store and process information.
Exponentially fast computation, totally safe cryptosystem, teleporting a quantum state are possible by making use of states & operations which do not exist in the classical world.
Necessary Conditions for a PC to Work ProperlyNecessary Conditions for a PC to Work Properly
Hardware (Memory, CPU etc), Able to reset all the memories to 0, The PC lasts till a computation stops
(maybe a problem if it takes more than 10 years to finish the computation.)
Able to carry out any logic operations Able to output the results (display, printer,
…)
Overview @ Tehran 2009
Necessary Conditions for a Quantum Computer to Necessary Conditions for a Quantum Computer to Work Properly (DiVincenzo Criteria)Work Properly (DiVincenzo Criteria)
Hardware (Memory, CPU etc)
Able to reset all the memories to 0,
The PC lasts till a computation stops.
Able to carry out any logic operations Able to output the results (display, printer, )
A scalable physical system with well charactA scalable physical system with well characterized qubits.erized qubits.
The ability to initialize the state of the qubits The ability to initialize the state of the qubits to a simple fiducial state, such as |00…0>.to a simple fiducial state, such as |00…0>.
Long decoherence times, much longer than Long decoherence times, much longer than the gate operation time.the gate operation time.
A “universal” set of quantum gates.A “universal” set of quantum gates. A qubit-specific measurement capability.A qubit-specific measurement capability.