The most popular unit of quantum information is the qubit, a two-level quantum system.

Any two-level quantum system can be used as a qubit.

In quantum mechanics, the Bloch sphere is a geometrical representation of the pure state space of a two-level quantum mechanical system ( qubit ), named after the physicist Felix Bloch.

Given an orthonormal basis, any pure state of a two-level quantum system can be written as a superposition of the basis vectors

* Bloch sphere, geometrical representation of the pure state space of a two-level quantum mechanical system

In quantum mechanics, a two-state system ( also known as a TLS or two-level system ) is a system which has two possible quantum states.

Unlike other physical implementations of a qubit which involve truly two-level systems, such as nuclear spin and photon polarization, the integrated quantum circuit involved in a superconducting qubit is a many-level system, of which only the first two levels are used as the computational basis.

* Qubits Any two-level quantum system can form a qubit, and there are two ways to form a qubit using the electronic states of an ion:

** A non maskable interrupt ( NMI ) which can be used to respond to power down situations and / or other high priority events ( and allowing a minimalistic Z80 system to easily implement a two-level interrupt scheme in mode 1 ).

# Martin Luther rejected the Roman Catholic approach and developed a different two-level system McArthur refers to as the two realms view.

Modern signal processors yield greater performance ; this is due in part to both technological and architectural advancements like lower design rules, fast-access two-level cache, ( E ) DMA circuitry and a wider bus system.

* The computer game Vangers uses voxels for its two-level terrain system.

It requires municipalities to be established for the whole territory of South Africa, and provides for three categories of municipalities, whereby some areas are governed by a single " Category A " municipal authority and others are governed by a two-level system with a larger " Category C " municipality containing multiple " Category B " municipalities.

When an atom ( or some other two-level system ) is illuminated by a coherent beam of photons, it will cyclically absorb photons and re-emit them by stimulated emission.

An avoided energy-level crossing in a two-level system subjected to an external magnetic field.

One of the first instances of an ethical hack being used was a “ security evaluation ” conducted by the United States Air Force of the Multics operating systems for " potential use as a two-level ( secret / top secret ) system.

For a two-level system with magnetic moment, the formula reduces to

He initiated the introduction of a two-level minimum salary system, but his proposal was not negotiated by the National Assembly-that time with a right-wing majority.

Owned and operated by the Port Authority of New York and New Jersey, the complex includes a ten-story tower, a retail plaza, a bus station, a two-level parking facility, and the Journal Square station of PATH rail transit system.

In this case, a two-level arrangement is used, or with two electric circuits for double-railed lines the overhead line pylons for both directions are equipped with cross beams for their own traction current system of two conductor cables each.

Any state of the two-level system can be written as a superposition of the energy eigenstates ; in particular, at time we can write

The set of all states in a two-level system can be mapped onto a representation known as the Bloch sphere.

If a coherent, narrow bandwidth laser is applied to a two-level system, the wave function will undergo Rabi flopping ( Rabi oscillation ) between the ground and excited states.

The information content of a message can, for this reason, be measured in terms of the minimum number n of two-level systems which are needed to store the message: consists of n qubits.

' He argues that one of the main reasons for introducing rule utilitarianism was to do justice to the general rules that people need for moral education and character development and he proposes that “ a difference between act-utilitarianism and rule-utilitarianism can be introduced by limiting the specificity of the rules, i. e., by increasing their generality .” This distinction between a ‘ specific rule utilitarianism ’ ( which collapses into act utilitarianism ) and ‘ general rule utilitarianism ’ forms the basis of Hare ’ s two-level utilitarianism.

The general rule for a two-level adaptive predictor with an n-bit history is that it can predict any repetitive sequence with any period if all n-bit sub-sequences are different.

The advantage of the two-level adaptive predictor is that it can quickly learn to predict an arbitrary repetitive pattern.

Newer processors from Intel and AMD can predict indirect branches by using a two-level adaptive predictor.

Two-level grammar can also refer to a formal grammar for a two-level formal language, which is a formal language specified at two levels, for example, the levels of words and sentences.

Utilizing adaptive modulation on up to 1155 OFDM sub-carriers, turbo convolution codes for error correction, two-level MAC framing with ARQ, and other techniques, HomePlug AV can achieve near the theoretical maximum bandwidth across a given transmission path.

All of the above can be more easily understood by recognizing that Dirac's equation has the form of an optical two-level atom in Schroedinger theory, whose energy levels are separated, at least for a free electron, by the Zitterbewegung energy and whose energy levels are coupled coherently.

Disadvantage compared to standard Michaels is that after an opposing minor suit opening one can not introduce a two suiter in the majors at two-level.

With this kind of two-level implementation, a carry may first propagate through the " slow road " of individual adders, then, on reaching the left-hand end of its group, propagate through the " fast road " of 4-bit lookahead carry logic, then, on reaching the left-hand end of its supergroup, propagate through the " superfast road " of 16-bit lookahead carry logic.

Given this, the bidding is said to start at the one-level when contracting for a total of seven tricks, at the two-level for eight tricks and so on to the seven-level to contract to take all thirteen tricks.

Pulse modulation schemes aim at transferring a narrowband analog signal over an analog baseband channel as a two-level signal by modulating a pulse wave.

In telecommunications, delay encoding is the encoding of binary data to form a two-level signal where ( a ) a " 0 " causes no change of signal level unless it is followed by another " 0 " in which case a transition to the other level takes place at the end of the first bit period ; and ( b ) a " 1 " causes a transition from one level to the other in the middle of the bit period.

The passenger terminal at VPS is a two-level, 107, 000 square foot facility as was opened in November 2004.

The Shops at National Place is an adjacent two-level dining / shopping complex.

Still, the corporate descendant of Dayton's -- Target Corporation -- has a large presence on the Mall, with both their corporate headquarters at 10th Street and a two-level retail store at 9th.

Aside from Jordan Marsh at one end, there were two long, flanking two-level wings separated by a two-story open courtyard mall surrounded by large, open parking lots.

Some machines incorporate a feature called two-level claw power, which, when enabled, causes the claw to at first grip at full strength, but then weaken its grip to the normal level after a brief delay.

* Stack interchange ( two-level, three-level, or four-level stack, depending on how many levels cross at the central point )

A notable example is the two-level store at Merry Hill Shopping Centre in the West Midlands ( which formed part of an Enterprise Zone ).

* New suit is non-forcing at the two-level, but forcing at the three-level.

The plans include demolishing the food and skate rental kiosk, along with the addition of an upper level roof terrace overlooking the square ; a two-level restaurant at the southwest corner of the square, with outdoor patio and terrace dining ; a glass tourist information pavilion at the Queen and Bay Streets corner ; a versatile stage structure under a glazed roof canopy ; redesigned landscaping along the edges of the square that increases the number of trees, planting, mixed tree species ; expansion and enhancement of the Peace Garden, with a flowering tree grove, eternal flame, and reflecting pool ; landscaping and a café on the podium roof of City Hall ; upgrading the overhead walkways with wood decking, seating, glass balustrades, light wells and improved access ; and a seasonal disappearing water fountain in the centre of the square.

Located at the intersection of US 31 ( Montgomery Highway ) and Interstate 459, the Riverchase Galleria complex includes the two-level, mall, the 15-story, Wynfrey Hotel, and the 17-story, Galleria Tower office building.

East of 12th Street, SR 195 ascends onto a two-level viaduct — eastbound on the upper level and westbound on the lower level — east to its directional interchange with I-95 ( Richmond – Petersburg Turnpike ) at the north end of James River Bridge just east of the railroad Triple Crossing at the southeastern corner of Downtown Richmond.

* Crossing the Charles River at the Boston University Bridge, replacing the local street bridge with a two-level local and elevated highway bridge, or bypassing the bridge with a tunnel