25 research outputs found
Quantum computing and complexity in art
The author draws on her research experience in quantum computing to discuss the conception and form of an interactive installation CLOUD. CLOUD explores complexity in the post-digital by referencing the principles of quantum superposition, quantum entanglement and quantum measurement
MA Digital Direction, MA Information Experience Design
This paper addresses some of the key research imperatives two courses, MA Digital Direction and MA Information Experience Design, embody, including the status of virtual and augmented realities, two technologies that are ontologically unstable, raising urgent research questions for staff and students alike.
For IED Information can be quantitative or qualitative, numerical data, personal narratives, or socio-political issues. These are examined through investigative and experiential research, through a range of methods, to create transformative, immersive and multisensory experiences, with emphasis on content, context, materiality and atmosphere. For MA Digital Direction, the catalysing impact of digital technologies associated with time based media are addressed, in particular the course is concerned with both experimental and established approaches to production, direction, content creation and communication, in order to create innovative forms of storytelling and narrative experience that engage audiences in new ways.
Both courses deploy augmented and virtual realities, with MA Digital Direction devoting a term to Immersive Adventures. And yet, the status of VR is still uncertain and has been a challenge for some years (Hillis, 1996: 70). Like the photograph, it is not clear exactly what VR is, whether it is a medium, a tool, an event or an extension of cinema. The ontological status of what it feels like to encounter VR, is also an enigma, in line with Dennett’s (1991) assertions about ineffable, subjective experience, or qualia.
These and other questions about VR/AR technologies, as well as teaching strategies, are at the core of a new research hub established by academics within the School of Communication. The hub aims to address the question of how we can best teach a subject which no one truly understands, identifying some of the possibilities inherent in our own uncertainty and disorientation
Spatial Entanglement From Off-Diagonal Long Range Order in a BEC
We investigate spatial entanglement - particle-number entanglement between
regions of space - in an ideal Bosonic gas. We quantify the amount spatial
entanglement around the transition temperature for condensation by probing the
gas with two localised two-level systems. We show that spatial entanglement in
the gas is directly related to filling of the ground state energy level and
therefore to the off-diagonal long-range order of the system and the onset of
condensation.Comment: 7 pages, 3 figures. Extended from 4 to 7 pages. More detailed
derivations of key formula. Extended introduction and background. Results
remain unchange
Detection and engineering of spatial mode entanglement with ultra-cold bosons
We outline an interferometric scheme for the detection of bi-mode and
multi-mode spatial entanglement of finite-temperature,interacting Bose gases of
fixed particle number. Whether entanglement is present in the gas depends on
the existence of the single-particle reduced density matrix between different
regions of space. We apply the scheme to the problem of a harmonically trapped
boson pair and show that while entanglement is rapidly decreasing with
temperature, a significant amount remains for all interaction strengths at zero
temperature.Thus, by tuning the interaction parameter, the distribution of
entanglement between many spatial modes can be modified.Comment: 5 pages, 3 figure
Bell inequality for pairs of particle-number-superselection-rule restricted states
Proposals for Bell inequality tests on systems restricted by superselection
rules often require operations that are difficult to implement in practice. In
this paper, we derive a new Bell inequality, where pairs of states are used to
by-pass the superselection rule. In particular, we focus on mode entanglement
of an arbitrary number of massive particles and show that our Bell inequality
detects the entanglement in the pair when other inequalities fail. However, as
the number of particles in the system increases, the violation of our Bell
inequality decreases due to the restriction in the measurement space caused by
the superselection rule. This Bell test can be implemented using techniques
that are routinely used in current experiments.Comment: 9 pages, 6 figures; v2 is the published versio
Equilibrium and Disorder-induced behavior in Quantum Light-Matter Systems
We analyze equilibrium properties of coupled-doped cavities described by the
Jaynes-Cummings- Hubbard Hamiltonian. In particular, we characterize the
entanglement of the system in relation to the insulating-superfluid phase
transition. We point out the existence of a crossover inside the superfluid
phase of the system when the excitations change from polaritonic to purely
photonic. Using an ensemble statistical approach for small systems and
stochastic-mean-field theory for large systems we analyze static disorder of
the characteristic parameters of the system and explore the ground state
induced statistics. We report on a variety of glassy phases deriving from the
hybrid statistics of the system. On-site strong disorder induces insulating
behavior through two different mechanisms. For disorder in the light-matter
detuning, low energy cavities dominate the statistics allowing the excitations
to localize and bunch in such cavities. In the case of disorder in the light-
matter coupling, sites with strong coupling between light and matter become
very significant, which enhances the Mott-like insulating behavior. Inter-site
(hopping) disorder induces fluidity and the dominant sites are strongly coupled
to each other.Comment: about 10 pages, 12 figure
Dissipation enhanced vibrational sensing in an olfactory molecular switch
Motivated by a proposed olfactory mechanism based on a
vibrationally-activated molecular switch, we study electron transport within a
donor-acceptor pair that is coupled to a vibrational mode and embedded in a
surrounding environment. We derive a polaron master equation with which we
study the dynamics of both the electronic and vibrational degrees of freedom
beyond previously employed semiclassical (Marcus-Jortner) rate analyses. We
show: (i) that in the absence of explicit dissipation of the vibrational mode,
the semiclassical approach is generally unable to capture the dynamics
predicted by our master equation due to both its assumption of one-way
(exponential) electron transfer from donor to acceptor and its neglect of the
spectral details of the environment; (ii) that by additionally allowing strong
dissipation to act on the odorant vibrational mode we can recover exponential
electron transfer, though typically at a rate that differs from that given by
the Marcus-Jortner expression; (iii) that the ability of the molecular switch
to discriminate between the presence and absence of the odorant, and its
sensitivity to the odorant vibrational frequency, are enhanced significantly in
this strong dissipation regime, when compared to the case without mode
dissipation; and (iv) that details of the environment absent from previous
Marcus-Jortner analyses can also dramatically alter the sensitivity of the
molecular switch, in particular allowing its frequency resolution to be
improved. Our results thus demonstrate the constructive role dissipation can
play in facilitating sensitive and selective operation in molecular switch
devices, as well as the inadequacy of semiclassical rate equations in analysing
such behaviour over a wide range of parameters.Comment: 12 pages, 6 figures, close to published version, comments welcom
Bell-inequality test of spatial mode entanglement of a single massive particle
Experiments showing the violation of Bell inequalities have formed our belief
that the world at its smallest is genuinely non-local. While many non-locality
experiments use the first quantised picture, the physics of fields of
indistinguishable particles, such as bosonic gases, is captured most
conveniently by second quantisation. This implies the possibility of non-local
correlations, such as entanglement, between modes of the field. In this paper
we propose an experimental scheme that tests the theoretically predicted
entanglement between modes in space occupied by massive bosons. Moreover, the
implementation of the proposed scheme is capable of proving that the particle
number superselection rule is not a fundamental necessity of quantum theory but
a consequence of not possessing a distinguished reference frame.Comment: 5 pages, 2 figures. Version two has been accepted for publication in
Physical Review