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Topic: Qubit

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  Qubit - Wikipedia, the free encyclopedia
A qubit is not to be confused with a cubit, which is an ancient measure of length.
A pure qubit state is a linear quantum superposition of those two states.
When qubits are used in a quantum computation the computation must be carried out a number of times such that appropriate answer is obtained.
en.wikipedia.org /wiki/Qubit   (658 words)

 Charge qubit - Wikipedia, the free encyclopedia
A charge qubit is formed by a tiny superconducting island (also known as a Cooper-pair box) coupled by a Josephson junction to a superconducting reservoir (see figure).
The state of the qubit is determined by the number of Cooper pairs which have tunneled across the junction.
The charge qubit is typically read-out with an extremely sensitive electrometer such as the radio-frequency single-electron transistor.
en.wikipedia.org /wiki/Charge_qubit   (218 words)

If a single quantum bit or qubit can be in 2 states at once then 3 qubits together can represent 8 numbers all at one.
In this scenario one qubit would be 1 and 0, and the three qubits would be 000, 001...
This qubit is given to both computers who want to communicate and is then used to decrypt all data passing between them.
www.geocities.com /celnick666/qubit.html   (1750 words)

 qubit - a Whatis.com definition   (Site not responding. Last check: 2007-09-18)
A qubit is a quantum bit, the counterpart in quantum computing to the binary digit or bit of classical computing.
Just as a bit is the basic unit of information in a classical computer, a qubit is the basic unit of information in a quantum computer.
Each of these particles is known as a qubit; the nature and behavior of these particles (as expressed in quantum theory) form the basis of quantum computing.
whatis.techtarget.com /definition/0,,sid9_gci341232,00.html   (708 words)

 Hitachi claims Cambridge qubit silicon success
Qubits are also subject to the strange phenomenon of quantum entanglement.
Qubits have been made before in gallium arsenide but these have had very short coherence times of a couple of nanoseconds.
As qubits can be combined in a variety of two-dimensional circuits, as in conventional microprocessors, there is the possibility of scaling-up from one device to a large quantum circuit, which is Hitachi Cambridge Laboratory's next project.
www.eetasia.com /ART_8800375918_480200_21870cd0.HTM?from=RSS   (441 words)

 Flux-qubit website
We use a DC SQUID coupled to the qubit to measure the flux generated by the persistent currents flowing through it, and thus to detect its state after all coherent operations are done (figure 2C).
2 : A) The persistent-current qubit is a three-junction loop biased by an external flux.
B) Low-energy diagram of the persistent-current qubit C) Detection (in gray) and manipulation (in purple) of the qubit.
qt.tn.tudelft.nl /research/fluxqubit/fluxqubit.html   (939 words)

 Business Wire: Qubit Technoloy Selects LH3, Inc. and Havoc Int... @ HighBeam Research   (Site not responding. Last check: 2007-09-18)
Qubit Technology (http://www.qubit.net), a pioneer in the Internet Appliance market, recently selected LH3, Inc. (http://www.lh3.com) and Havoc Interactive (http://www.havocinteractive.com) as agencies of record.
Qubit marries the convenience of modern appliances with the intelligence of technology.
Always with the end user in mind, Qubit has brought together strategic hardware and technology partners in an endeavor to "de-mystify" the essence of the Internet, bringing home technology that is far easier to embrace and less confusing to use.
www.highbeam.com /library/doc0.asp?DOCID=1G1:64202452&refid=holomed_1   (381 words)

 Haiku :: View topic - Qubit web tablet that runs BeIA or Embeded linux
The Qubit cradle plugs into a kitchen outlet and a phone or cable jack and acts as a home base for the tablet, containing the circuitry for recharging the tablet's batteries, which can run up to three hours between recharges, and the housing for the wireless infrared keyboard.
The Qubit tablet features a 10.4-inch, 800 x 600 color LCD display with a high-resolution touch screen and a stand on the back of the tablet for tabletop viewing.
Qubit is also working with financial institutions and telecommunications companies to bring these Internet access devices to market.
www.haiku-os.org /forums/viewtopic.php?t=334   (1051 words)

 [No title]
When a qubit is in this state it can be thought of as existing in two universes, as a 0 in one universe and as a 1 in the other.
This is the problem of decoherence and is a stumbling block for quantum computers as the potential power of quantum computers depends on the quantum parallelism brought about by the coherent state [14].
An example of an implementation of the qubit is the 'quantum dot' which is basically a single electron trapped inside a cage of atoms [7].
www.doc.ic.ac.uk /~nd/surprise_97/journal/vol4/spb3   (5889 words)

 Turns of Phrase: Qubit
qubit (pronounced exactly the same was as the Old Testament measurement, the cubit) is a “quantum bit”;, the analogue at quantum dimensions of the ordinary computer’s 1 or 0, on or off, heads or tails binary digit or bit.
Unlike such digital representations, a qubit remains in an indeterminate state until it is observed, like a tossed coin that is still spinning.
It was shown recently that in theory a quantum computer could solve certain mathematical problems, such as factoring large numbers, much faster than conventional ones, and so could be used, for example, in codebreaking.
www.worldwidewords.org /turnsofphrase/tp-qub1.htm   (199 words)

 APS - 2005 APS March Meeting - Event - Quantum Coherence in a Superconducting Flux Qubit   (Site not responding. Last check: 2007-09-18)
As the flux applied to the qubit was swept through the degeneracy point, $(n+1/2)\Phi_0$, we could resolve the change in qubit screening flux produced by the reversal of the qubit circulating current.
By applying microwave radiation to the qubit, we observed resonant excitation when the qubit level splitting matched the energy of the microwave photons, corresponding to a change in the qubit screening flux.
We performed coherent manipulation of the qubit state by applying microwave pulses of fixed amplitude and frequency, but variable width.
meetings.aps.org /Meeting/MAR05/Event/25148   (204 words)

 Notes on Quantum Computing and Related Topics   (Site not responding. Last check: 2007-09-18)
Alice then measures the Bell state of the entangled pair consisting of the qubit taken from the original Bell state pair and the unmeasured qubit she wishes to teleport to Bob, which is in the state
Alice measures the Bell state formed by her qubit and the unknown qubit and then tells Bob which transformation to make on his qubit to regenerate the original unmeasured qubit state.
This collapse of the state of Bob's qubit due to a measurement performed by Alice is an example of the Einstein-Podolsky-Rosen (EPR) paradox.
www.qtc.ecs.soton.ac.uk /lecture2/p5.html   (690 words)

 Trivial Two-Qubit Example
A quantum version of the two bit example from the previous section consists of two physical qubits, where the errors randomly apply the identity or one of the Pauli operators to the first qubit.
Obviously, a one-qubit state can be stored in the second physical qubit without being affected by the errors.
In this case, the identification of syndrome and information-carrying subsystems is the obvious one associated with the two physical qubits.
www.eskimo.com /~knill/qip/ecprhtml/node9.html   (135 words)

 Qubit PDA Sound System
Qubit provide the mobile speaker and a cigarette power lead with cigarette lighter so that even the less technically minded user can be up and running in just a few minutes.
Helpfully Qubit even provide a 12v cigarette lighter pass-thru socket so that you don't lose the ability to charge your PDA whilst the Qubit system is using the car's socket.
Qubit's device is lightning fast in sensing an audio input and only occasionally can any clipping be detected and even then it is barely noticeable.
www.pocketgpsworld.com /qubit-sound.php   (745 words)

 One Qubit Gates
One-qubit gates can be thought of as rotations of the Bloch sphere and can be implemented in NMR with electromagnetic pulses.
In general, the effect of a magnetic field on a nuclear spin is to cause a rotation around the direction of the field.
As a result, the qubit's state does not change unless RF pulses are applied.
www.eskimo.com /~knill/qip/nmrprhtml/node6.html   (1195 words)

 An introduction to Quantum Computing
This qubit property arises as a direct consequence of its adherence to the laws of quantum mechanics which differ radically from the laws of classical physics.
Similarly, a quantum computer manipulates qubits by executing a series of quantum gates, each a unitary transformation acting on a single qubit or pair of qubits.
The answer is primarily those errors that arise as a direct result of decoherence, or the tendency of a quantum computer to decay from a given quantum state into an incoherent state as it interacts, or entangles, with the state of the environment.
www.cs.caltech.edu /~westside/quantum-intro.html   (3038 words)

 Qubit - Quantiki   (Site not responding. Last check: 2007-09-18)
In essence, each independent state of the quantum particle used in the computer can follow its own independent computation path to conclusion while its other states are observed and changed.
A number of qubits taken together is a quantum register.
This is a two dimentional space which has an underlying geometry of the surface of a sphere.
cam.qubit.org /wiki/index.php/Qubits   (464 words)

 Business Wire: Qubit Technology Acquires Former US West Dex Ex... @ HighBeam Research   (Site not responding. Last check: 2007-09-18)
Qubit Technology (http://www.qubit.net), a pioneer in the Internet Appliance market, today announced that Margaret McGuckin has joined the company as Chief Operating Officer.
Qubit will rely heavily on her experience in this area in terms of business model development, distribution strategies and overall marketing strategy and execution.
Her past success is testament to the level of results we can expect from her at Qubit," said David Armitage, president and CEO of Qubit Technology.
www.highbeam.com /library/doc0.asp?DOCID=1G1:65204298&refid=holomed_1   (505 words)

 The Delft spin qubit project
They suggested that the spin of a single electron confined in a quantum dot could be used as a quantum bit (qubit), the building block of a quantum computer.
This was made possible by a special design of the dot and an integrated quantum point contact as a charge detector (see AFM image).
• Observation of the qubit levels in a direct electrical transport measurement of the Zeeman splitting of one electron in a quantum dot in a magnetic field.
qt.tn.tudelft.nl /research/spinqubits   (654 words)

We introduce a basis for a 2-qubit; the first is the control qubit, the second is the target qubit; they form an entangled state.
We see that: when the control qubit (qubit 1) is zero, the target qubit is left unchanged, and when qubit 1 has value 1, then qubit 2 is flipped.
The main idea: A has 2 lines, a control qubit line on which it stores originally the state psi>, and a target qubit line on which is encoded one half of the entangled 2-qubit state.
www.yorku.ca /marko/ComPhys/Qubit/Qubit.html   (1713 words)

 Science & Technology at Scientific American.com: Coherent Computing -- Making qubit superpositions in ...   (Site not responding. Last check: 2007-09-18)
In the race for quantum computers, researchers would love to sculpt quantum bits, or qubits, with existing chip-manufacturing techniques.
Qubits are able to exist as both 0 and 1 at once.
But the same wires that would make qubit chips easy to manipulate and link together also connect them to the quantum-defiling messiness of the outside world.
www.sciam.com /article.cfm?articleID=000CA75E-DE97-1D29-97CA809EC588EEDF   (239 words)

 QuBiT - Electronics   (Site not responding. Last check: 2007-09-18)
QuBiT is a specialist high technology electronics company located in Copenhagen, Denmark.
QuBiT has pioneered the art of custom designing, manufacturing and marketing unique electronic devices for mobile IT industry.
QuBiT has a vision to incorporate the latest technology to their designs and produce products of high quality and reliability.
www.qubit.dk   (89 words)

 Blue Dust
QuBit is a library to support Quantum Superpositions in C++.
The QuBit has exhausted all it's superpositions to produce the result, and is consequently empty.
It might be useful to know that there is (at least) one number less than 20 in a particular case, but it would be more useful to know which numbers are less than 20.
www.bluedust.com /qubit   (920 words)

 Quantum computing: Qubit power   (Site not responding. Last check: 2007-09-18)
Memory in quantum computers is created by the manipulation of quantum bits.
In contrast to classical computers, where memory is a string of 'ones' and 'zeros', quantum bits (or qubits) can be in a superposition of many different states at once, so a quantum computer has the potential to be much more powerful than a classical computer.
The only physical system for which all the ingredients necessary for quantum computing have been demonstrated in the laboratory is ion trap technology, but it has not been clear whether the ion trap system is scalable in practice.
www.nature.com /nature/links/020613/020613-4.html   (129 words)

 EETimes.com - Hitachi claims Cambridge qubit silicon success   (Site not responding. Last check: 2007-09-18)
LONDON — A team at Hitachi’s Cambridge Laboratory at the University of Cambridge in England has developed a silicon device for quantum computing: a quantum-dot charge “qubit”.
Quantum computers make use of quantum bits (qubits), which can exist for a limited time as a superposition of two quantum states —; a mixture of both 0 and 1 simultaneously.
The Cambridge team has performed all the basic operations —’; initialization, manipulation, and measurement — using electrical gates for initialization and manipulation, and a single-electron transistor for measurement, Hitachi said.
www.eetimes.com /showArticle.jhtml?articleID=170102536   (611 words)

 Qubit Designs :: Website Design Solutions
Qubit Designs is proud to announce that we are now back open for business!
Qubit Designs will be closed to new projects from July 31 to August 15 because Benjamin Jack, our lead designer, will be away.
Qubit Designs carefully blends art and technology to develop web site designs and computer graphics that are both visually pleasing and effective.
www.qubitdesigns.com   (320 words)

Qubit Master is available as a free download and as such will run for 45 days.
To use it after this trial period expires, Qubit Master has to be registered.
Open Qubit Master's About box (from the Help menu) and get the User Name displayed right under the current registration status.
www.quantum-intelligence.com /register.htm   (203 words)

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