Abstract
Quantum state transfer from an information-carrying qubit to a receiving qubit is ubiquitous for quantum information technology. In a closed quantum system, this task requires precisely-timed control of coherent qubit-qubit interactions that are intrinsically reciprocal. Here, breaking reciprocity by tailoring dissipation in an open system, we show that it is possible to autonomously transfer a quantum state between stationary qubits without time-dependent control. We present the general requirements for this directional transfer process, and show that the minimum system dimension for transferring one qubit of information is 3 $\times$ 2 (between one physical qutrit and one physical qubit), plus one auxiliary reservoir. We propose realistic implementations in present-day superconducting circuit QED experiments, and further propose schemes compatible with long-distance state transfer using impedance-matched dissipation engineering.
Highlights
Dissipation in a quantum system from its coupling with the environment usually causes decoherence, which has been a major roadblock for quantum information technologies
Going beyond individual state preparation [2,3,4,5,18,19] and manifold confinement [10,20], we investigate the feasibility of implementing a dynamic manipulation of a quantum manifold using dissipation: autonomous quantum state transfer (AQST)
We show that AQST can be quite generally achieved by explicitly synthesizing a dissipative process that (i) acts equivalently on different logical states and is blind to the encoded information and (ii) establishes directionality by driving the system into a dark-state manifold that stores information in B
Summary
Dissipation in a quantum system from its coupling with the environment usually causes decoherence, which has been a major roadblock for quantum information technologies. Quantum state transfer implemented in cascaded systems so far still requires time-dependent control to dynamically couple and decouple storage modes from the reservoir [31,32,33,34].
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