Quantum information and quantum computation
... outcomes for the nal measurement. What is special about a quantum computer? Are there things that it can do that an ordinary digital computer cannot do? \Not at all," you might argue. Sure, a quantum computer operates according to dierent physical principles than a classical computer, but a classi ...
... outcomes for the nal measurement. What is special about a quantum computer? Are there things that it can do that an ordinary digital computer cannot do? \Not at all," you might argue. Sure, a quantum computer operates according to dierent physical principles than a classical computer, but a classi ...
Spin Squeezing on an Atomic Clock Transition.
... individual particles constitutes a fundamental source of noise that limits the precision of the measurement7–9 at the standard quantum limit (SQL). The SQL is the fundamental limit for measurements with ensembles of uncorrelated particles. However, quantum mechanics allows one to redistribute the qu ...
... individual particles constitutes a fundamental source of noise that limits the precision of the measurement7–9 at the standard quantum limit (SQL). The SQL is the fundamental limit for measurements with ensembles of uncorrelated particles. However, quantum mechanics allows one to redistribute the qu ...
Implementing and Characterizing Precise Multiqubit Measurements
... must first disentangle the cavity. In the last step [Fig. 2(c)], we remove this residual entanglement, unconditionally resetting the cavity to the vacuum, by essentially inverting (or “echoing”) the unitary dynamics of the first step. Finally, we use this composite gate to enact a multiqubit measure ...
... must first disentangle the cavity. In the last step [Fig. 2(c)], we remove this residual entanglement, unconditionally resetting the cavity to the vacuum, by essentially inverting (or “echoing”) the unitary dynamics of the first step. Finally, we use this composite gate to enact a multiqubit measure ...
Implementation of a quantum algorithm on a nuclear magnetic
... recent years. The basic logic elements necessary to carry out quantum computing are well understood, and quantum algorithms have been developed, both for simple demonstration problems6–8 and for more substantial problems such as ...
... recent years. The basic logic elements necessary to carry out quantum computing are well understood, and quantum algorithms have been developed, both for simple demonstration problems6–8 and for more substantial problems such as ...
Bell inequalities made simple(r):
... experimental non-locality tests). Straightforward, but inefficient ...
... experimental non-locality tests). Straightforward, but inefficient ...
Entanglement and Quantum Teleportation
... Alice has managed to communicate two bits of information to Bob by sending only one qubit, provided they shared a Bell state to start To create and share a Bell state, they must have (at some point) transmitted a qubit, although this transmission could be in either direction The important point: the ...
... Alice has managed to communicate two bits of information to Bob by sending only one qubit, provided they shared a Bell state to start To create and share a Bell state, they must have (at some point) transmitted a qubit, although this transmission could be in either direction The important point: the ...
Classical limit and quantum logic - Philsci
... In the foundations of physics, the quest of explaining how the laws of classical mechanics arise from the laws of quantum mechanics is known as the classical limit problem (Cohen 1989). Generally, this limit is studied for systems that, due to its interaction with the environment, develop a process ...
... In the foundations of physics, the quest of explaining how the laws of classical mechanics arise from the laws of quantum mechanics is known as the classical limit problem (Cohen 1989). Generally, this limit is studied for systems that, due to its interaction with the environment, develop a process ...
... Standing in stark contrast to these physical requirements are the conditions that exist in and around animal brains. Brains are warm, wet, biological constructs, honed by evolution to exhibit the sort of robustness and durability needed for survival in the world. Although to some extent they are pro ...
Why We Thought Linear Optics Sucks at Quantum Computing
... publication in some form if we could strengthen the argument … we now hope the referee will endorse our paper for publication in PRA.” ...
... publication in some form if we could strengthen the argument … we now hope the referee will endorse our paper for publication in PRA.” ...
Edge-mode superconductivity in a two
... to occur in the surface states of three-dimensional systems, in the edge states of two-dimensional systems, and in onedimensional wires1,2. Localized Majorana zero-modes obey non-Abelian exchange statistics, making them interesting building blocks for topological quantum computing3,4. Here, we repor ...
... to occur in the surface states of three-dimensional systems, in the edge states of two-dimensional systems, and in onedimensional wires1,2. Localized Majorana zero-modes obey non-Abelian exchange statistics, making them interesting building blocks for topological quantum computing3,4. Here, we repor ...
Composite systems and their representation in quantum and
... The shareability justifies the counterfactual reasoning. ...
... The shareability justifies the counterfactual reasoning. ...
Identifying student and teacher difficulties in interpreting
... At the end of the nineteenth century, some phenomena related to the emission and absorption of electromagnetic radiation could not be explained adequately using classical physics based on electromagnetic waves. The energy distribution of the radiation emitted by a blackbody and the discrete spectra ...
... At the end of the nineteenth century, some phenomena related to the emission and absorption of electromagnetic radiation could not be explained adequately using classical physics based on electromagnetic waves. The energy distribution of the radiation emitted by a blackbody and the discrete spectra ...
AN2 ATOMS
... For two particles which attract, such as a positively charged nucleus and a negatively charged electron, the potential energy at any finite separation must, therefore, be negative. (See also, for instance, the example of a diatomic molecule in §5-10 of Forces and Energy.) Although each electron also ...
... For two particles which attract, such as a positively charged nucleus and a negatively charged electron, the potential energy at any finite separation must, therefore, be negative. (See also, for instance, the example of a diatomic molecule in §5-10 of Forces and Energy.) Although each electron also ...
The Wave Function
... from knowledge of the wave function alone, the exact position and momentum of a particle at the same time. In the extreme case that ∆x = 0, then the position uncertainty is zero, but Eq. (3.14) tells us that the uncertainty on the momentum is infinite, i.e. the momentum is entirely unknown. A simila ...
... from knowledge of the wave function alone, the exact position and momentum of a particle at the same time. In the extreme case that ∆x = 0, then the position uncertainty is zero, but Eq. (3.14) tells us that the uncertainty on the momentum is infinite, i.e. the momentum is entirely unknown. A simila ...
Balanced homodyne detection with high common mode rejection
... very important not only to generate highly squeezed light [5] but also to measure accurately the highly squeezed light. A typical method to generate highly squeezed light is utilization of sub-threshold optical parametric oscillator (OPO). By improving the stability of phase locking and reducing the ...
... very important not only to generate highly squeezed light [5] but also to measure accurately the highly squeezed light. A typical method to generate highly squeezed light is utilization of sub-threshold optical parametric oscillator (OPO). By improving the stability of phase locking and reducing the ...
PDF only - at www.arxiv.org.
... However, any such inclusive conception would have to revise, not only our notion of the states of atomic objects, but of macroscopic objects also. This point was best illustrated by Schrödinger in his famous 'cat paradox'. A single photon in a state of superposition is connected to a detector, which ...
... However, any such inclusive conception would have to revise, not only our notion of the states of atomic objects, but of macroscopic objects also. This point was best illustrated by Schrödinger in his famous 'cat paradox'. A single photon in a state of superposition is connected to a detector, which ...
Producing Squeezed Input States for an Atomic Clock Using an Optical Cavity.
... Standard Quantum Limit) as we use more and more photons to establish that prediction. The black curve, on the other hand, shows the contrast of a Ramsey sequence using as input the state that we prepared by the first measurement: as more and more photons are used they decohere the state unt ...
... Standard Quantum Limit) as we use more and more photons to establish that prediction. The black curve, on the other hand, shows the contrast of a Ramsey sequence using as input the state that we prepared by the first measurement: as more and more photons are used they decohere the state unt ...
Quantum noise properties of multiphoton transitions in driven nonlinear resonators
... spectrum of a parametrically modulated oscillator yields detailed information on the population of the quasienergy states of the resonator in its stationary state [3, 25]. Since the noise power spectrum is, in principle, experimentally accessible, one can directly deduce the stationary nonequilibriu ...
... spectrum of a parametrically modulated oscillator yields detailed information on the population of the quasienergy states of the resonator in its stationary state [3, 25]. Since the noise power spectrum is, in principle, experimentally accessible, one can directly deduce the stationary nonequilibriu ...
