Events Calendar
Quantum reservoir engineering in circuit QED
Thursday January 15, 2015
| 3:30 pm
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Presenter: | Steve Girvin, Yale University |
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| Series: | CQuIC Seminars | |
| Abstract: |
Quantum systems are never completely isolated, but instead interact with degrees of freedom in the surrounding environment, eventually leading to decoherence of the system. The conventional route to long-lived quantum coherence involves minimizing coupling to the dissipative bath. Paradoxically, it is possible in principle to instead engineer specific couplings to a quantum environment that allow dissipation to actually create and preserve coherence. I present a simple scheme to engineer the photon shot noise in a microwave cavity so that it relaxes a qubit towards any desired point on the Bloch sphere. This scheme is inspired by laser cooling in optomechanics and has recently been realized experimentally by the Siddiqi group at Berkeley [1]. A more complex scheme has been used to autonomously stabilize an entangled Bell state for a pair of qubits [2]. Other ideas are being developed for stabilizing Schroedinger Cat states of photons [3] for use in autonomous quantum error correction schemes. [1.] "Cavity-assisted quantum bath engineering," K.W. Murch, et al., Phys. Rev. Lett. 109, 183602 (2012). [2.] "˜Autonomously stabilized entanglement between two superconducting quantum bits," S. Shankar, et al., Nature 504, 419-422 (2013). [3.] "˜Dynamically protected cat-qubits: a new paradigm for universal quantum computation," Mazyar Mirrahimi, et al., New J. Phys. 16, 045014 (2014). |
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| Host: | Carlton Caves | |
| Location: | PAIS-2540, PAIS | |
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