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SUMMARY:CMSP Seminar: The critical cat code: Quantum error suppression thr
ough a dissipative phase transition
DTSTART;VALUE=DATE-TIME:20221201T103000Z
DTEND;VALUE=DATE-TIME:20221201T113000Z
DTSTAMP;VALUE=DATE-TIME:20230205T152028Z
UID:indico-event-10120@ictp.it
DESCRIPTION:\n Vincenzo Savona\n\n (Center for Quantum Science and Enginee
ring\, Ecole Polytechnique Fédérale de Lausanne\, Switzerland)\n \n Ab
stract:\n\n \n The main limitation to large-scale quantum computing are
quantum errors\, inevitably produced by the interaction with the environme
nt. Similar to errors in classical computers\, the main strategy to correc
t quantum errors is redundancy\, which is realized by encoding the state o
f a logical qubit onto a subspace of the state-space of a larger quantum s
ystem. In textbook quantum error correction\, the larger space is provided
by a set of several physical qubits. The most promising alternative to th
is standard are bosonic quantum codes. In a bosonic code\, a logical qubit
is encoded onto a subspace of the state space of the quantum harmonic osc
illator. The Schrödinger's cat bosonic code is arguably the most promisin
g of these codes. Here\, I will give a pedagogical introduction to bosonic
quantum codes and to the cat code in particular. I will then illustrate t
he link between bosonic codes and dissipative phase transitions. I will co
nclude by presenting our recent results on a novel regime of operation of
the cat code\, where the vicinity of a first-order dissipative phase trans
ition\, with spontaneous symmetry breaking\, enables a considerably improv
ed performance in quantum error suppression\, and opens the way to the des
ign and demonstration of the first multi-qubit quantum gates on boson-enco
ded qubits.\n \n\n Zoom registration link:https://zoom.us/meeting/regist
er/tJEqf-2tqDojGtSZE_pJ_IRLuBCKOrPxSiJd\n \n\n//indico.ictp.it/event/101
20/
LOCATION:Hybrid Seminar Luigi Stasi Seminar Room + Zoom
URL://indico.ictp.it/event/10120/
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