795,596 research outputs found
Universal quantum computation using only projective measurement, quantum memory, and preparation of the 0 state
What resources are universal for quantum computation? In the standard model,
a quantum computer consists of a sequence of unitary gates acting coherently on
the qubits making up the computer. This paper shows that a very different model
involving only projective measurements, quantum memory, and the ability to
prepare the |0> state is also universal for quantum computation. In particular,
no coherent unitary dynamics are involved in the computation.Comment: 4 page
Immersive learning research
Editorial. Material for the special issue "Immersive Learning Research" of the Journal of Universal Computer Science.Welcome to the Journal of Universal Computer Science (J.UCS) special issue organized by the Immersive Learning Research Network (iLRN) following the 2017 iLRN conference. This issue includes eight papers on the focused topic "Immersive Learning Research", including extended versions of papers presented at iLRN 2017 and articles from the public call for papers.info:eu-repo/semantics/publishedVersio
A universal computer control system for motors
A control system for a multi-motor system such as a space telerobot, having a remote computational node and a local computational node interconnected with one another by a high speed data link is described. A Universal Computer Control System (UCCS) for the telerobot is located at each node. Each node is provided with a multibus computer system which is characterized by a plurality of processors with all processors being connected to a common bus, and including at least one command processor. The command processor communicates over the bus with a plurality of joint controller cards. A plurality of direct current torque motors, of the type used in telerobot joints and telerobot hand-held controllers, are connected to the controller cards and responds to digital control signals from the command processor. Essential motor operating parameters are sensed by analog sensing circuits and the sensed analog signals are converted to digital signals for storage at the controller cards where such signals can be read during an address read/write cycle of the command processing processor
Universal quantum computer from a quantum magnet
We show that a local Hamiltonian of spin-3/2 particles with only two-body
nearest-neighbor Affleck-Kennedy-Lieb-Tasaki and exchange-type interactions has
an unique ground state, which can be used to implement universal quantum
computation merely with single-spin measurements. We prove that the Hamiltonian
is gapped, independent of the system size. Our result provides a further step
towards utilizing systems with condensed matter-type interactions for
measurement-based quantum computation.Comment: 5 pages, 3 figure
ROM-based computation: quantum versus classical
We introduce a model of computation based on read only memory (ROM), which
allows us to compare the space-efficiency of reversible, error-free classical
computation with reversible, error-free quantum computation. We show that a
ROM-based quantum computer with one writable qubit is universal, whilst two
writable bits are required for a universal classical ROM-based computer. We
also comment on the time-efficiency advantages of quantum computation within
this model.Comment: 12 pages, 3 figures, minor corrections + section 5 substantially
change
Quantum computation over continuous variables
This paper provides necessary and sufficient conditions for constructing a
universal quantum computer over continuous variables. As an example, it is
shown how a universal quantum computer for the amplitudes of the
electromagnetic field might be constructed using simple linear devices such as
beam-splitters and phase shifters, together with squeezers and nonlinear
devices such as Kerr-effect fibers and atoms in optical cavities. Such a device
could in principle perform `quantum floating point' computations. Problems of
noise, finite precision, and error correction are discussed.Comment: 9 pages, Te
- …