This topical group, extending over
two weeks, will bring together a select number of
practitioners in the field of Quantum Information
Science, Adiabatic Quantum Computing, as well as the
interface between Atomic Physics, Quantum Optics,
and Condensed Matter Physics. The dates are Oct.
617. There will be a small number of talks (12) a
day and ample time for discussions and interactions.
Schedule:
Mon. Oct.
6 
10:00am  2:00pm, Pratt
Conference Room, CfA
2:00pm  6:00pm, LISE 303,
Harvard Physics

Tues.
Oct. 7 
10:00 am  LISE
319
Xuedong Hu 
Univ. of Buffalo and RIKEN
Semiconducting Qubits
2:00 pm  LISE 303
Edward Laird 
Harvard
"Hyperfinemediated gatedriven electron
spin resonance"
Other rooms
reserved for informal meeting:
10:00 am  12:00 am, Lyman 330, Harvard
Physics and 11:30am  3:00pm, Tea Room,
CfA

Wed. Oct
8 
10:00 am  Tearoom  Center
for Astrophysics
Sahel Ashhab, Digital
Materials Laboratory RIKEN
"Quantum nonlocality of a single
delocalized particle"
2:00pm  LISE 303, Harvard
Physics
Hendrik Bluhm (Harvard)
Title TBD
Joint Atomic Physics Colloquium
4:30 pm  Dave Cory (MIT), "Error Finding
and Control for Quantum Processors"
Jefferson Lab 356
Other rooms reserved for
informal meeting:
10:00am  12:30pm, Phillips
Auditorium, CfA
Other rooms reserved:
10:3012:30 Phillips

Thurs. Oct 9 
10:00 am  1:00pm Meeting
Room C34
Dr. William D. Oliver, MIT Lincoln
Laboratory, Analog Device Technology Group
"Amplitude spectroscopy of a
superconducting artificial atom"
Dr. Jonas Bylander, MIT Research
Laboratory of Electronics, Superconducting
Circuits and Quantum Computation Group,
MIT
" Pulse calibration and nonadiabatic
control of a superconducting artificial
atom"
2:00 pm  LISE 303,
Harvard Physics
Jimmy Williams (Harvard)
"The Effect of pn Junctions on
Mesoscale Transport in Graphene"
3:00
pm
Jeff Miller (Harvard)
"Quasiparticle Properties from Tunneling
in the nu = 5/2 Fractional Quantum Hall
State"

Fri. Oct
10 
The Harvard University
Center for Nanoscale Systems (CNS) and the
National Nanotechnology Infrastructure
Network announce (NNIN) a one day
workshop: Photosynthesis  from Elementary
Processes to Quantum SimulationDivision
Room  M102 in Mallinckrodt, 12 Oxford
Street from 9am4pm
For More Information
Regarding this one day workshop, please
contact, Anna B Shin, Group Administrator,
Department of Chemistry and Chemical
Biology, 6174969964. or online at http://cns.fas.harvard.edu/about/docs/photosynthesis.pdf
Other rooms reserved:
10:302:00 Pratt

Mon. Oct 13 
10 am: Dr. Sekhar
Ramanathan, MIT Title: NMR studies of
quantum information processes
4:30 pm: Frank Gaitan, RIKEN and Univ. of
S. Illinois: Density functional theory and
quantum computation
Abstract: We demonstrate the
applicability of groundstate and
timedependent density functional theory
to quantum computing by proving the
HohenbergKohn and RungeGross theorems
for a fermion system representing N
qubits. Timedependent density functional
theory is used to determine the minimum
energy gap Delta(N) arising from
application of the quantum adiabatic
evolution algorithm to the NPComplete
problem MAXCUT. As density functional
theory has been used to treat quantum
systems with as many as 650 interacting
degrees of freedom, this raises the
realistic prospect of evaluating the gap
Delta(N) for systems with N ~ 650 qubits.
Ref. F. Gaitan and F.
Nori, Density functional theory and
quantum computation, arXiv:0809.1170v1
[quantph]

Tues. Oct 14 
10:00am  11:00am, Pratt,
CfA
"Quantum control of spins
in diamond"
Paola Cappellaro, ITAMP
NitrogenVacancy (NV) centers in diamond
have emerged as excellent candidates for
quantum information processing, since they
can be optically polarized and detected,
and present good coherence properties even
at room temperature. In this talk I will
present the application of coherent
control techniques to the electronic and
nuclear spins associated with NV centers.
I will first show how this solid state
system can be used as the building block
of a scalable architecture for quantum
computation or communication, and present
potential strategies for the efficient
control of these small quantum registers.
Then I will present a novel approach to
magnetometry, based on NV centers, that
takes advantage of coherent control
techniques and the confinement of the
sensing spins into a sample of nanometer
dimensions. The resulting magnetic sensor
is projected to yield an unprecedented
combination of high sensitivity and
spatial resolution, with the potential of
exciting applications in bioscience,
materials science, and single electronic
and nuclear spin detection.
11:00 am  12:00 noon, Pratt CfA
Jero Maze, "Nanoscale magnetic sensing
using a single electron spin in
diamond"
3:00 pm Tearoom, CfA: Dr. Toshiaki Iitaka,
RIKEN: Title: Largescale simulation of
timeevolving qubits
Natural timeevolution of qubits is one
of attractive approaches for quantum
information [1]. I will talk about
numerical techniques for simulating the
timeevolution of interacting spins [2]
and their application to quantum magnets
[3] and quantum dots [4].
[1] K. Maruyama, T.
Iitaka, F. Nori, Enhancement of
entanglement transfer in a spin chain by
phaseshift control Phys. Rev. A 75,
012325 (2007). [2] T. Iitaka, T.
Ebisuzaki, Algorithm for linear response
functions at finite temperatures,
Application to ESR spectrum of s=1/2
antiferromagnet Cu benzoate. Phys. Rev.
Lett. 90, 047203 (2003). [3] M. Machida,
T. Iitaka and S. Miyashita, Temperature
dependence of ESR intensity for the
nanoscale molecular magnet V15, J. Phys.
Soc. Jpn. Suppl. 74, 107110 (2005). [4]
Shintaro Nomura and Toshiaki Iitaka,
Linear scaling calculation of a ntype
GaAs quantum dot, Phys. Rev. E 76, 037701
(2007).

Wed. Oct 15 
10:00 am LISE 3rd floor
Room 320
Speaker: Robert
Johansson: Singleartificialatom lasing
and its suppression by strong pumping
Abstract: We consider a system composed
of a single artificial atom coupled to a
cavity mode. The artificial atom is biased
such that the most dominant relaxation
process in the system takes the atom from
its ground state to its excited state,
thus ensuring population inversion. Even
under this condition, lasing action can be
suppressed if the `relaxation' rate, i.e.
the pumping rate, is larger than a certain
threshold value. Using simple
transitionrate arguments and a
semiclassical calculation, we derive
analytic expressions for the lasing
suppression condition and the state of the
cavity in both the lasing and
suppressedlasing regimes. The results of
numerical calculations agree very well
with the analytically derived results. Our
analysis and results are relevant to the
recently realized superconducting
artificialatom laser
Reference: S. Ashhab,
J.R. Johansson, A.M. Zagoskin, F. Nori
Singleartificialatom lasing and its
suppression by strong pumping (2008).
4:30 Jefferson Lab 356
Special ITAMP Colloquium
Speaker: Franco Nori: Designing
superconducting qubit circuits that
exhibit atomicphysicslike phenomena on
a chip
Abstract:
Superconducting (SC) circuits can behave
like atoms making transitions between a
few energy levels. Such circuits can test
quantum mechanics at macroscopic scales
and be used to conduct atomicphysics
experiments on a silicon chip. This talk
overviews a few of our theoretical studies
on SC circuits and quantum information
processing (QIP) including: SC qubits for
single photon generation and for lasing;
controllable couplings among qubits; how
to increase the coherence time of qubits
using a capacitor in parallel to one of
the qubit junctions; hybrid circuits
involving both charge and flux qubits;
quantum tomography in SC circuits;
preparation of macroscopic quantum
superposition states of a cavity field via
coupling to a SC qubit; generation of
nonclassical photon states using a SC
qubit in a microcavity; scalable qubit
circuits; and information processing with
SC qubits in a microwave field.
Controllable couplings between qubits can
be achieved either directly or indirectly.
This can be done either with or without
coupler circuits, as well as either with
or without databuses like EM fields in
cavities (e.g., we will describe both the
variablefrequency magnetic flux approach
and also a generalized doubleresonance
approach that we introduced). It is also
possible to "turn a quantum bug into a
feature'' by using microscopic defects as
qubits, and the macroscopic junction as a
controller of it. We have also studied
ways to implement "cluster states'' in SC
circuits.
For a general
overview of this field, see, J.Q. You
and F. Nori, Physics Today 58, No. 11,
42 (2005)

Thurs.
Oct 16 
10:00am  2:00pm,
Jefferson 453, Harvard Physics
10:00 Alexey Akimov,
"Quantum optics with nanoscale surface
plasmons"
11:00 Frank Koppens,
"NearField Electrical Detection of Guided
Surface Plasmons"
12:00 Liang Jiang,
"Anyonic interferometry and protected
memories in atomic spin lattices"
2:00pm  5:00pm, Classroom,
CfA

Fri. Oct 17 
12:00pm , Lyman 425
Toshi Iitaka, "Quantum
Dynamics"
1:00 pm, Lyman 425
Frank Gaitan, "Quantum
Computing and Density Functional Theory"

