Measuring time-energy resources for quantum processes

Parallel Session BThe speed of any quantum process is limited by quantum mechanics via time-energy uncertainty relations and they imply that time and energy are tradeoff with each other. As such, we propose to measure the time-energy as a single unit for quantum channels. We consider a time-energy measure for quantum channels and compute lower and upper bounds of it using the channel Kraus operators. For a special class of channels (which includes the depolarizing channel), we obtain the exact value of the time-energy measure. Our result can be used to compare the time-energy resources of similar quantum processes. In particular, we show that erasing quantum information requires √(n + 1)/n) times more time-energy resource than erasing classical information, where n is the system dimension. This work is published in [1].postprin

Relation between physical time-energy cost of a quantum process and its information fidelity

published_or_final_versio

Measuring time-energy resources for quantum processes

Parallel Session BThe speed of any quantum process is limited by quantum mechanics via time-energy uncertainty relations and they imply that time and energy are tradeoff with each other. As such, we propose to measure the time-energy as a single unit for quantum channels. We consider a time-energy measure for quantum channels and compute lower and upper bounds of it using the channel Kraus operators. For a special class of channels (which includes the depolarizing channel), we obtain the exact value of the time-energy measure. Our result can be used to compare the time-energy resources of similar quantum processes. In particular, we show that erasing quantum information requires √(n + 1)/n) times more time-energy resource than erasing classical information, where n is the system dimension. This work is published in [1].postprin

Statistical fluctuation analysis for measurement-device-independent quantum key distribution

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Two-way deterministic quantum key distribution against detector-side-channel attacks

published_or_final_versio

Conditions for degradability of tripartite quantum states

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Entanglement transformation between sets of bipartite pure quantum states using local operations

published_or_final_versio

Differential-phase-shift quantum key distribution using heralded narrow-band single photons

published_or_final_versio

Physical time-energy cost of a quantum process determines its information fidelity

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