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Curriculum Vitæ Markus Ansmann Education 2009 Doctor of Philosophy, Physics, University of California, Santa Barbara (expected) 2007 Master of Arts, Economics, University of California, Santa Barbara 2007 Certificate, Graduate Program in Management Practice, University of California, Santa Barbara 2003 Bachelor of Science, Physics, University of California, Santa Barbara Publications Ansmann, M., Wang, H., Bialczak, R. C., Hofheinz, M., Lucero, E., Neeley, M., O’Connell, A. D., Sank, D., Weides, M., Wenner, J., Cleland, A. N., Martinis, J. M., “Violation of Bell’s inequality in Josephson phase qubits”, Submitted to Nature (2009) Martinis, J. M., Ansmann, M., and Aumentado, J., “Energy Decay in Josephson Qubits from Non-equilibrium Quasiparticles”, Submitted to Physical Review Letters (2009) Hofheinz, M., Wang, H., Ansmann, M., Bialczak, R. C., Lucero, E., Neeley, M., O’Connell, A. D., Sank, D., Wenner, J., Martinis, J. M., and Cleland, A. N., “Synthesizing arbitrary quantum states in a superconducting resonator”, Nature (2009), 459:546-549 Wang, H., Hofheinz, M., Ansmann, M., Bialczak, R. C., Lucero, E., Neeley, M., O’Connell, A. D., Sank, D., Wenner, J., Cleland, A. N., and Martinis, J. M., “Measurement of the decay of Fock states in a superconducting quantum circuit”, Physical Review Letters (2008), 101:240401 xi
Page 1: UNIVERSITY of CALIFORNIA Santa Barb
Page 5: Benchmarking the Superconducting Jo
Page 8 and 9: viii
Page 12 and 13: Katz, N., Neeley, M., Ansmann, M.,
Page 14 and 15: A., Lubin, P., Marvil, J., McCreary
Page 16 and 17: a stronger correlation than possibl
Page 18 and 19: 2 Superconducting Josephson Qubits
Page 20 and 21: 6.1.3 Atomic Force Microscopy . . .
Page 22 and 23: 9.2.5 Phase Calibration . . . . . .
Page 24 and 25: xxiv
Page 26 and 27: 8.1 Squid I/V . . . . . . . . . . .
Page 28 and 29: xxviii
Page 30 and 31: hours by 2010 [Coles et al., 2006].
Page 32 and 33: any possible classical computer for
Page 34 and 35: 1.2 The Power of Quantum Computers
Page 36 and 37: states, effectively giving it 2 n+1
Page 38 and 39: Podolsky, and Rosen [Einstein et al
Page 40 and 41: 1.3.1 Scalable Physical System with
Page 42 and 43: this, but must still be universal.
Page 44 and 45: While the underlying technology pro
Page 46 and 47: The specifics of implementing the i
Page 48 and 49: Equation 2.2 can be rewritten as: C
Page 50 and 51: other states using a classical exci
Page 52 and 53: • The horizontal line along the V
Page 54 and 55: Figure 2.3: Modified Inductor-Capac
Page 56 and 57: If the inductor is removed from the
Page 58 and 59: a constant bias at which the potent
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ground of a wire of any usable leng
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Figure 2.6: Squid Readout Scheme -
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Chapter 3 Understanding Qubits Nume
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Equation 3.6, also called the “ti
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As the eigenstates are ortho-normal
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This can be expressed as a tri-diag
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pecially for the higher levels, for
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• The x-range over which the pote
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This will most likely take forbiddi
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Figure 3.3: Simulation of Mock-Qubi
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| 12 〉 and | 14 〉 (desired tran
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Figure 3.4: Bloch Sphere - a) Bloch
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safely ignored. This step is called
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3.3.3 Single Qubit Operations in a
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To couple qubits 2 and 3 out of fiv
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P ′′ | 01 〉(t) = (1 − X 21
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sphere. Instead, it corresponds to
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[ ] 1 0 K ϕa (∆t) = 0 e −∆t/
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Figure 4.1: Qubit Circuit: The qubi
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obtain control electronics that can
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will focus only on the integrated c
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Figure 4.2: Readout Squid - a) Circ
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the qubit to dissipate energy and t
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Figure 4.4: Spice Coupler Design -
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4.2.1 Qubit When designing the indu
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4.2.2 Bias Coil The design of the b
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small scales of these barriers, it
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Chapter 5 Phase Qubit Fabrication T
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that will be used in the later fabr
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the sapphire wafer is positioned cl
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5.3.3 ICP Etch Next, the wafer is l
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quality of the film deposited in th
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During this step, argon ions are ac
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Figure 5.5: 3D View of Junction: Th
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5.9 Top Wiring Layer - Part III Sin
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Chapter 6 Device Testing Equipment
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6.1.2 Scanning Electron Microscopy
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6.2 Electrical Screening after Fabr
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down to temperatures around 4 K. Th
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happens continuously, the DR can th
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This melts the aluminum wire and bo
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a readout line. These two lines are
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described in Chapter 8 (specificall
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Filters selectively attenuate certa
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Chapter 7 Control Software - LabRAD
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Requirement. Second, as the control
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7.2.3 Efficiency To promote accepta
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dent modules, but it also provides
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Another benefit of this hard separa
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different angles simultaneously, if
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7.3.3 Cross-Language and Cross-Plat
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useful to us in the future. Beyond
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Table 7.1: Basic LabRAD Types Type
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Table 7.5: LabRAD Packet Structure
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7.4.2 LabRAD Manager The LabRAD Man
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process. The SI conversion factors
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languages like Python it should be
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structure kept in the Server that h
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This is especially useful if second
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Figure 7.1: Control Layout: The con
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The next layers correspond to the
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7.5.5 Grapher At the far left of th
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hard drive. Having a central author
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which it prepends with the current
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system that needs to be changed in
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are involved in the experiment and
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to the “Sampling Scope Server”,
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eception of packets, and return the
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7.5.18 IPython In addition to using
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Chapter 8 Single Qubit Bring-Up and
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Figure 8.1: Squid I/V: Axis scales
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Figure 8.2: Squid Steps - a) Bias s
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where the potential has two stable
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picking the “operating branch”,
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Figure 8.4: Step Edge - a) Bias seq
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Plotting P T unnel versus the qubit
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Figure 8.6: S-Curve - a) Bias seque
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8.6 Spectroscopy Using this prelimi
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wave pulse at the qubit resonance f
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Figure 8.9: Visibility - a) Bias se
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as a function of the delay between
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Figure 8.12: Spin Echo - a) Bias se
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Figure 8.13: Fine Spectroscopy - a)
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Chapter 9 Coupled Qubit Bringup The
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is of significant concern for relia
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Figure 9.1: Effect of Squid Crossta
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Figure 9.2: Measure Pulse Timing -
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Figure 9.3: Spectroscopy of Coupled
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Figure 9.5: Capacitive Coupling Res
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9.2.5 Phase Calibration The trickie
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9.3 Resonator Based Coupling The me
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9.3.1 2D-Spectroscopy To couple a s
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Figure 9.9: Swapping Photon out of
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Figure 9.10: Resonator Swaps - a) S
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a Ramsey-type experiment needs to b
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Chapter 10 Hidden Variable Theories
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10.1.3 Settling the Question Experi
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Table 10.1: Possible Populations fo
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This restriction is called the Bell
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This leads to the correlation value
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“choosing” between polarization
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croscopic quantum systems like atom
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Chapter 11 Implementing the Bell Te
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singlet state due to the extra fact
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process of the qubits in two ways:
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[Steffen et al., 2006] (the details
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11.2.1 Bell Rotations The first ste
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P | 11 〉 (a ′ b ′ )) estimate
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Table 11.3: Sequence Parameters - C
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Table 11.5: Sequence Parameters - C
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the data taking can lead to thermal
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and back towards the position of th
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Table 11.6: Qubit Sample Parameters
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Table 11.8: Optimization Results -
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this leads to a modification of the
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Table 11.11: Optimization Results -
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Figure 11.3: Standard Error Analysi
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20 minutes worth of data. Within ea
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Figure 11.4: Behavior of S: Examini
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Figure 11.5: Quantifying Measuremen
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11.5.4 Numerical Simulation To unde
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Table 11.13: Qubit Sample Parameter
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Figure 11.7: Visibility Analysis -
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pair, independent of the measuremen
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Chapter 12 Conclusion 12.1 Claim of
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information about the quality of th
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Bibliography J. Altepeter, E. Jeffr
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Max Hofheinz, E. M. Weig, M. Ansman
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Matthew Neeley, M. Ansmann, Radosla
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