Emily Davis

The Role of the Mentor in Supporting New Teachers: Associations with Self-Efficacy, Reflection, and Quality

In our study, we examined variation in mentoring aspects of an induction program for 77 novice teachers and associations with self-efficacy, reflection, and quality of student–teacher interactions. Mentors’ previous experience and full- vs. part-time status predicted novices’ perception of support, reflection, and observed student–teacher interactions. Time spent with a mentor, participation in mentor-facilitated professional development activities and the quality of mentors’ interactions with novice teachers were related to novice teachers’ perceptions of mentoring success, self-reflection, and efficacy. The data in our study add to the growing research suggesting the need to look within the mentoring experience to more fully understand the working mechanisms and important contributors to their success.

One- and two-axis squeezing of atomic ensembles in optical cavities

The strong light-matter coupling attainable in optical cavities enables the generation of highly squeezed states of atomic ensembles. It was shown in [Phys. Rev. A 66, 022314 (2002)] how an effective one-axis twisting Hamiltonian can be realized in a cavity setup. Here, we extend this work and show how an effective two-axis twisting Hamiltonian can be realized in a similar cavity setup. We compare the two schemes in order to characterize their advantages. In the absence of decoherence, the two-axis Hamiltonian leads to more squeezing than the one-axis Hamiltonian. If limited by decoherence from spontaneous emission and cavity decay, we find roughly the same level of squeezing for the two schemes scaling as (NC)^(1/2) where C is the single atom cooperativity and N is the total number of atoms. When compared to an ideal squeezing operation, we find that for specific initial states, a dissipative version of the one-axis scheme attains higher fidelity than the unitary one-axis scheme or the two-axis scheme. However, the unitary one-axis and two-axis schemes perform better for general initial states.

Continuously tunable modulation scheme for precision control of optical cavities with variable detuning

We present a scheme for locking optical cavities with arbitrary detuning by many linewidths from resonance using an electro-optic modulator that can provide arbitrary ratios of amplitude-to-phase modulation. We demonstrate our scheme on a Fabry-Perot cavity, and show that a well-behaved linear error signal can be obtained by demodulating the reflected light from a cavity that is detuned by several linewidths.